Comprehensive management system and method for saline-alkali-sandy land

Abstract

The application discloses a kind of saline-alkali sandy land comprehensive management system and method.The land management system is sequentially arranged bush dune creating unit, annular plant sand barrier unit and injection type saline-alkali treatment unit along the main wind direction;Bush dune creating unit includes at least one bubble curtain generating module, for generating bubble curtain above the surface of wind-sand-saline-alkali land, and establishing bush dune;Annular plant sand barrier unit includes multiple annular plant sand barrier structures and multiple spool planting units, spool planting unit includes multiple planting spool structures, planting spool structure includes spool-shaped soil carrier and plant seeds and / or plant seedlings;Injection type saline-alkali treatment unit includes multiple underground fissure zones distributed in the stratum of wind-sand-saline-alkali land, underground fissure zone is filled with saline-alkali soil improvement material.The land management system combines saline-alkali treatment and wind-sand protection, can achieve the sand-fixing effect of imitating natural bush dune, to block wind and fix sand in a more natural way for a long time.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of saline-alkali sandy land comprehensive management system and method, belong to desert area ecological environment management technical field. BACKGROUND

[0002] Saline-alkali sandy land is the land with saline-alkali and sandy characteristics, that is, the soil salt content is high and the sand content is large, vegetation is difficult to grow, and the ecological system is fragile.

[0003] At present, the main measures taken in the treatment of saline-alkali sandy land in China are as follows. First, water improvement method, including irrigation washing salt, dissolving salt by introducing fresh water and discharging through drainage system. Construction of drainage system, such as open ditch, buried pipe or vertical well drainage; second, physical improvement method, including deep ploughing and deep tillage to improve soil salt distribution. Replacement of low-salt soil. Covering salt to reduce water evaporation; then, chemical improvement method, including application of modifier to reduce soil acidity and alkalinity, and replacement of sodium ion. Increase of organic fertilizer to improve soil structure; in addition, biological improvement method, including planting salt-tolerant plants to absorb salt and using salt-tolerant microorganisms to improve soil.

[0004] Although the above methods can effectively improve saline-alkali sandy land, there are still many technical problems in the treatment of saline-alkali sandy land. First, washing salt and drainage are difficult. In the process of washing salt, a large amount of fresh water is needed, but in many saline-alkali sandy areas, fresh water resources are scarce, and if the drainage system is not perfect, the salt water after washing salt cannot be discharged, which will re-enter the soil, resulting in salt accumulation. Second, soil structure reconstruction is complex. The soil structure of saline-alkali sandy land is poor, with high sand content and weak aggregation. It is difficult to improve soil structure, such as increasing soil organic colloid content, which often accompanies large-scale operations such as deep ploughing, soil replacement and setting irrigation and drainage facilities, with large disturbance of surface soil and high risk of wind erosion. Moreover, the cost of improvement engineering is high, the process is complex, and long-term continuous investment is needed to see obvious effect.

[0005] Therefore, in order to solve the above problems, we have developed a kind of saline-alkali sandy land comprehensive management system and method, which aims to combine saline-alkali treatment and wind-sand protection, establish a kind of less disturbance, multifunctional comprehensive protection system for saline-alkali sandy land, and reduce the harm of saline-alkali and wind-sand to roads, energy facilities and other facilities. SUMMARY

[0006] In view of the shortcomings of the prior art, the purpose of the present application is to provide a kind of saline-alkali sandy land comprehensive management system and method.

[0007] To achieve the above-mentioned purpose of the application, the technical scheme adopted by the present application comprises:

[0008] The embodiment of the present application provides a kind of saline-alkali sandy land comprehensive management system, including bush dune creating unit, annular plant sand barrier unit and injection type saline-alkali treatment unit sequentially arranged along the main wind direction;

[0009] Wherein, the bush dune creating unit is used to create bush dune on wind-sand saline-alkali land, and includes at least one bubble curtain generating module, which is arranged on the wind-sand saline-alkali land to generate a bubble curtain above the ground surface of the wind-sand saline-alkali land, the bubble curtain is a high-speed gas-liquid mixed flow in the shape of a solid fan or an inverted cone, the liquid is dispersed in the gas in the form of small droplets, and the high-speed gas serves to transport and disperse the droplets, and the distribution height range of the bubble curtain in the vertical direction at least partially overlaps with the distribution height range of the wind-sand flow flowing above the ground surface of the wind-sand saline-alkali land.

[0010] The annular plant sand barrier unit includes a plurality of annular plant sand barrier structures and a plurality of reel planting units, the annular plant sand barrier structure includes an annular nozzle mechanism and a composite sand barrier, the annular nozzle mechanism is arranged above the ground surface of the wind-sand saline-alkali land, and the water droplet falling surface of the annular nozzle mechanism is annular, for forming an annular irrigation area on the ground of the wind-sand saline-alkali land, the composite sand barrier includes dead plant branches grafted in the annular irrigation area and living xerophytic salt-tolerant plants planted between two adjacent dead plant branches, and the reel planting unit is distributed below the ground surface of the living xerophytic salt-tolerant plants in the annular irrigation area, and the top end is flush with the ground surface, the reel planting unit includes a reel-shaped soil carrier and plant seeds and / or plant seedlings, the reel-shaped soil carrier includes a reel formed by winding geotextile and planting material wound in the reel, and the root system of the plant seeds and / or plant seedlings is distributed in the planting material.

[0011] The injection type saline-alkali treatment unit includes a plurality of underground fissure zones distributed in the stratum of the wind-sand saline-alkali land, and the underground fissure zones are filled with saline soil improvement materials.

[0012] Further, each of the bush dune creating unit, the annular plant sand barrier unit and the injection type saline-alkali treatment unit is distributed on a corresponding functional strip, a plurality of functional strips are arranged in parallel, a blank area is arranged between adjacent functional strips, and the extension direction of the functional strip is perpendicular to the main wind direction, and the width of the blank area is 10-20 m.

[0013] Further, a protective object is arranged at the leeward of the injection type saline-alkali treatment unit.

[0014] Further, the bubble curtain generating module includes a bubble generator, the bubble generator is in communication with a gas source supply mechanism and a liquid supply mechanism respectively, and the gas source supply mechanism is in communication with a trigger mechanism.

[0015] Further, the bubble curtain generating module is connected with a support structure, and is installed above the ground surface of the aeolian saline land through the support structure.

[0016] Further, the bubble curtain has a covering height of 1-2 m and a diameter of 1-2 m.

[0017] Further, the bubble generator comprises a Venturi nozzle, and the water outlet position of the Venturi nozzle is 5-20 cm above the leakage surface.

[0018] Further, the bubble generator comprises a plurality of Venturi nozzles, and the plurality of Venturi nozzles are arranged in a V-shaped manner on the ground surface in the wind direction of the aeolian saline land, and the spacing between adjacent nozzles is 2-5 m.

[0019] Further, the spray direction of the Venturi nozzle of the bubble generator is towards the main wind direction and is arranged at an angle of 50-90° upwardly.

[0020] Preferably, the spray direction of the Venturi nozzle of the bubble generator is towards the main wind direction and is arranged at an angle of 60° upwardly.

[0021] Further, the shrub sand dune creating unit further comprises a triggering mechanism, which is used to start the bubble generator at least in the presence of wind sand flow.

[0022] Further, the plant material is in the form of a wet agglomerate and comprises uniformly mixed humus soil, sandy soil, decomposed sheep manure and water.

[0023] Further, the roll is wrapped by a rectangular geotextile, and the roll has a cylindrical shape, and the height of the roll is 30-60 cm and the diameter of the roll is 12-40 cm.

[0024] Further, the roll is distributed with 3-5 layers of plant material, and the thickness of each layer of plant material is 2-4 cm.

[0025] Further, the porosity of the geotextile is 30-50%.

[0026] Further, the length of the geotextile is 30-150 cm.

[0027] Further, each of the planting roll structures is distributed with 2-5 grams of plant seeds or 2-5 plant seedlings.

[0028] Further, the plant seedlings comprise xerophytic shrub seedlings, and the plant seeds comprise shrub and grass seeds.

[0029] Further, the annular irrigation area has an annular outer diameter of 1-3 m and a circular ring width of 20-50 cm.

[0030] Further, the multiple ring-shaped nozzle mechanisms are arranged in a triangular shape, and the distance between adjacent nozzles is 1-3m.

[0031] Further, the salt-tolerant and alkali-tolerant plants include salt-tolerant and alkali-tolerant shrubs and grasses.

[0032] Further, the ring-shaped nozzle mechanism is used to spray the humic acid solution in the ring-shaped irrigation area.

[0033] Further, the underground fissure area has a depth of 50-100cm and a diameter of 1-3m, and the width of the overlapping area between adjacent underground fissure areas is 0-3m.

[0034] Further, the salt-alkali soil improvement material is in a granular form, and the particle size is 1-4mm.

[0035] Further, the salt-alkali soil improvement material includes uniformly mixed humic acid, mature farmyard manure, organic matter, gypsum and microbial inoculum.

[0036] The embodiment of the present application also provides a salt-alkali sandy land comprehensive treatment method, which is implemented based on the salt-alkali sandy land comprehensive treatment system, and the method comprises the following steps:

[0037] The shrub-sand heap creating unit, the roll planting unit, the ring-shaped plant sand barrier unit and the injection type salt-alkali treatment unit are sequentially arranged along the main wind direction on the wind-sand salt-alkali land to be treated.

[0038] The bubble curtain is generated by the bubble curtain generating module in the shrub-sand heap creating unit, and the salt-tolerant and alkali-tolerant shrubs and grasses are planted in the sand surface range where the bubble curtain falls, so as to promote the wind-sand accumulation and fixation, thereby forming a shrub-sand heap in the downwind direction of the bubble curtain.

[0039] The plant seeds and / or plant seedlings in the roll planting unit are allowed to grow.

[0040] The plants in the ring-shaped plant sand barrier unit are allowed to grow.

[0041] The salt-tolerant and alkali-tolerant plants are planted in the underground fissure area in the injection type salt-alkali treatment unit, multi-point aeration is performed 2-3 times per year according to the soil salt-alkali degree and the crop growth cycle, and the salt-alkali soil improvement material is filled in the underground fissure area.

[0042] Further, the method specifically comprises the following steps.

[0043] The humic acid solution is sprayed to the ground of the wind-sand salt-alkali land by at least the ring-shaped nozzle mechanism to form a ring-shaped irrigation area, and the dead plant branches are cut and planted in the ring-shaped irrigation area to form a composite sand barrier, thereby forming the ring-shaped plant sand barrier unit.

[0044] Further, the method specifically comprises the following steps.

[0045] Using a soil aerator, the soil in the wind-blown sandy saline-alkali land is aerated at multiple points to loosen the compacted saline-alkali soil and form the underground fissure zone.

[0046] The soil aerator is used to inject granular saline-alkali soil amendment material into the underground fissure area, thereby forming the injection-type saline-alkali treatment unit.

[0047] Compared with the prior art, the advantages of the present invention include:

[0048] 1. The shrub-sand mound creation unit of this invention features an air bubble curtain set up upwind, formed by a mixture of compressed air and water. When the wind comes into contact with the air bubble curtain, the bursting and movement of the bubbles disrupts the wind flow, consuming wind energy, thereby reducing wind speed and settling sand particles. Combined with plant planting during the sand accumulation process, shrub-sand mounds are quickly formed for sand fixation. This method differs significantly from the principle of spraying sand fixation, where droplets contact sand particles, increasing their overall weight and causing them to fall, resulting in a better sand control effect. Furthermore, while the continuous shrub-sand mound clusters fix windblown sand, they gradually transform saline-alkali surfaces into sandy surfaces. The capillary action between sand particles is weaker than the capillary action within saline-alkali soil, which inhibits the upward movement and accumulation of salt, reducing soil salinity.

[0049] 2. Both the bubble curtain and the annular nozzle increase the air and soil humidity downwind, promoting plant growth within the annular vegetation sand barrier unit and the injected saline-alkali treatment unit, respectively, achieving synergistic effects between the units. This system integrates multiple functions: sand fixation and dust suppression, vegetation irrigation, establishment of shrub sand mounds, and salinity reduction. It mimics the sand-fixing principle of natural shrub sand mounds, rapidly establishing and simulating the curves and slopes of shrub sand mounds through the bubble curtain, providing long-term windbreak and sand fixation in a more natural manner, thereby increasing sand-fixing efficiency. It is suitable for wind and sand protection within photovoltaic power plant array areas, with flexible installation locations adaptable to various complex terrains and environments. The air pump spraying method is more water-saving, has low energy consumption, minimal environmental impact, relatively low cost, high stability, and is safe and reliable.

[0050] 3. In the ring-shaped plant sand barrier unit of this invention, a cylindrical planting unit is formed by wrapping a rectangular geotextile around and enclosing planting material within it. The multiple sidewalls of the geotextile promote water infiltration to the root system vertically and provide excellent multi-layer water retention horizontally. The densely porous geotextile allows plant roots to penetrate, ensuring plant growth. Compared to general large-area sprinkler irrigation, the irrigation area of ​​the ring-shaped plant sand barrier unit is more concentrated, allowing the humic acid solution to act more precisely around the plant roots, improving water and fertilizer utilization and reducing soil salinity. Furthermore, the sand is initially fixed using cuttings, and later, as the vegetation grows, a ring-shaped composite sand barrier of living organisms and branches is formed, resulting in rapid and efficient sand fixation.

[0051] 4、aeration process in the soil body forms a large number of cracks, to some extent, can block capillary action, inhibit the migration and accumulation process of underground saline water to the ground surface, so the salinity of the surface soil can be effectively reduced; at the same time, these cracks are beneficial to the infiltration of water, so that the accumulated salt and alkali on the ground is washed and discharged to the deeper soil, which will further reduce the salt and alkali content of the surface soil and promote the enrichment of salt and alkali in the deep soil; for the accumulation of deep salt, the material particles mixed by humic acid, mature farmyard manure, organic matter, gypsum, microbial agent and the like are injected into the cracks, which plays a role in improving the deep saline soil and is beneficial to the growth of plant roots. Therefore, the injection type saline-alkali treatment unit can reduce the salinity of the surface, deep and whole soil layers, and is completely improved, high in efficiency, simple in construction, green in environmental protection and low in cost. It can effectively improve the soil aeration, improve the soil microbial activity, improve the soil structure and enhance the soil self-purification capacity. Without the complex processes such as soil surface spraying and ploughing, the soil aeration and material particle injection process have small disturbance to the ground surface, and the wind erosion and sand hazards caused by the construction process can be effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 is a structural schematic view of a saline-alkali sandy land comprehensive treatment system according to an embodiment of the present application;

[0053] Figure 2 is a structural schematic view of a shrub sand heap creating unit and a shrub sand heap with less sand to more sand according to an embodiment of the present application;

[0054] Figure 3 is a top view of a shrub sand heap and a shrub sand heap creating unit according to an embodiment of the present application;

[0055] Figure 4 is a structural schematic view of a ring-shaped plant sand barrier structure according to an embodiment of the present application;

[0056] Figure 5 is a structural schematic view of a second plant unit and a reel planting unit according to an embodiment of the present application.

[0057] Explanation of reference numerals in the attached diagram: 1. Main wind direction; 2. Shrub-sand mound creation unit; 4. Circular plant sand barrier unit; 5. Bubble curtain; 6. Shrub-sand mound; 7. Circular plant sand barrier structure; 8. Roll-up planting unit; 9. Windward side; 10. Leeward side; 11. First plant unit; 12. Circular nozzle mechanism; 13. Second plant unit; 14. Roll-up soil carrier; 15. Filling layer; 16. Third plant unit; 17. Injection-type saline-alkali treatment unit; 18. Fissure zone; 19. Saline-alkali soil amendment material; 20. Fourth plant unit; 21. Protected object; 22. Ground surface; 23. Sand particle transport route after settling; 24. Bubble generator. Detailed Implementation

[0058] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The following will further explain and illustrate this technical solution, its implementation process, and its principles.

[0059] Example 1

[0060] like Figures 1-5 As shown, this embodiment provides a comprehensive management system for saline-alkali desertified land based on a bubble curtain, including a shrub sand mound creation unit 2, a ring-shaped plant sand barrier unit 4, and an injection-type saline-alkali treatment unit 17 arranged sequentially along the prevailing wind direction 1. The shrub sand mound creation unit 2 can form a bubble curtain 5, achieving multiple functions such as reducing wind speed, settling sand particles, and forming shrub sand mounds. The ring-shaped plant sand barrier unit 4 has a ring-shaped plant sand barrier structure 7 and a roll planting structure, which can form a ring-shaped composite plant chamber of cuttings and living plants, which can fix sand and retain water. The injection-type saline-alkali treatment unit 17 can effectively reduce the salinity and alkali content of the surface 22 and deep soil and improve various soil properties.

[0061] The shrub sand pile creation unit 2 includes an air source mechanism, a liquid source mechanism, a bubble generator 24, and a triggering mechanism. The air source mechanism and the liquid source mechanism are both connected to the bubble generator 24 and are used to be triggered by sand particles flowing in the air through the triggering mechanism to deliver the air source and liquid medium required to generate bubbles to the bubble generator 24. The shrub sand pile creation unit 2 is used to form a bubble curtain 5 and settle sand particles flowing along the main wind direction 1. The shrub sand pile 3 is formed by the accumulation of sand particles settled by the bubble curtain 5. The bubble curtain and plants work together to promote sand accumulation and form a stable and natural shrub sand pile sand fixation structure. Preferably, the shrub sand pile creation unit 2 also includes a pipeline system and a support component. The pipeline system is set between the air source mechanism and the bubble generator 24 and / or between the liquid source mechanism and the bubble generator 24, and is used to deliver air source and liquid medium to the bubble generator 24 to form a bubble curtain. The support component supports and fixes the entire shrub sand pile creation unit 2.

[0062] And, the first plant unit 11 is planted on the shrubbery sand heap 6, and the first plant unit 11 is used for stabilizing the shrubbery sand heap 6, and the shrubbery sand heap 6 is established by imitating the sand-fixing principle of the shrubbery sand heap in nature, so that the wind-blocking and sand-fixing can be realized in a natural way.

[0063] It should be noted that the air source mechanism includes but is not limited to any kind of air compressor or fan, wherein the air compressor can compress and deliver air to the subsequent pipeline system, and the fan is to make air flow by rotating blades, and the main function of the air source mechanism is to provide the air source required for generating bubbles.

[0064] The liquid source mechanism is a container containing liquid (usually water), and the liquid source mechanism is also equipped with a liquid level control system inside to maintain the stability of the liquid level, and the liquid source mechanism is connected to the bubble generator 24 through the pipeline system to provide liquid medium for generating bubble curtain.

[0065] The bubble generator 24 is the core component, and the bubble generator 24 includes but is not limited to any kind of micro-porous aerator or nozzle. Among them, the micro-porous aerator has many small holes inside, and air enters the liquid through these holes under the action of pressure to form fine bubbles; the nozzle is to mix air and liquid and break them into small bubbles through a special structure, such as a Venturi nozzle, which uses high-speed airflow to generate negative pressure inside the nozzle to suck in and mix liquid to generate bubbles, and the micro-porous aerator or nozzle of the bubble generator 24 is arranged in a triangular shape on the windward surface 22 of the aeolian saline land, the nozzle spacing is 2-5m, and the water outlet position is 5-20cm above the ground surface 22.

[0066] And, the shrubbery sand heap creating unit 2 further comprises a triggering mechanism, which comprises a wind erosion sensor and a trigger controller, the wind erosion sensor uses the H11 or H14 type wind erosion sensor produced by the American Campbell company, the height of the piezoelectric element of the wind erosion sensor from the ground surface 22 is set to 5cm, and the wind sand flow starting condition is monitored in real time, once the sand particles in the wind sand flow hit the piezoelectric element, the sensor can automatically trigger the trigger controller through program setting, the trigger controller is connected to the air source mechanism, and the air source mechanism starts to work to spray water and air from the bubble generator 24 at high speed to form a bubble curtain 5 for blocking wind and sand, and gradually establishing a shrubbery sand heap 6 on the leeward side, and the wind erosion sensor and the trigger controller are connected to the power supply system, such as the power supply system in the photovoltaic power field.

[0067] The pipeline system includes a delivery pipeline and a distribution pipeline, wherein the delivery pipeline is used to deliver the air source and the liquid medium to the bubble generator 24, and the delivery pipeline needs to have sufficient strength and sealing performance to withstand a certain pressure and prevent gas and liquid leakage; when there are multiple bubble generators 24, the distribution pipeline can uniformly distribute air and liquid to each bubble generator 24 to ensure the uniformity of the bubble curtain.

[0068] The support assembly comprises a frame and an adjusting device, the frame is used to fix the shrub sand heap creating unit 2 and the pipeline system. The material of the frame includes but is not limited to metal (such as stainless steel, aluminum alloy) and high-strength plastic. The frame needs to have sufficient strength and stability to withstand the weight of the device itself and external forces that may be encountered in outdoor environments, such as wind and sand erosion, collision, etc. The adjusting device can adjust the height and angle of the bubble generator 24. The height adjustment can adapt to different protection objects 21 and environmental requirements. The angle adjustment is to better align the bubble curtain with the wind direction to achieve the best windproof effect. Generally, the micro-porous aeration head or nozzle of the bubble generator 24 is oriented towards the main wind direction and is set at an angle of 60° upward.

[0069] The specific description of the synergistic effect of the shrub sand heap creating unit 2 and the shrub sand heap 6 is as follows: The bubble generator 24 is connected to the gas supply mechanism and the liquid supply mechanism through the pipeline system. The gas supply mechanism is connected to the trigger mechanism, which includes an aeolian erosion sensor and a trigger controller. When the sand flow passes, the sand particles hit the aeolian erosion sensor, triggering the trigger controller, which controls the air pump to start working. When the micro-porous aeration head or nozzle of the bubble generator 24 is oriented towards the main wind direction and is set at an angle of 60° upward, it has a large impact force and can achieve the best use effect. The bubble curtain 5 emitted by the micro-porous aeration head or nozzle of the bubble generator 24 is in the shape of a solid fan or an inverted cone. The emitted material is in a gas-liquid mixed state, with small droplets of liquid dispersed in the gas. The high-speed gas acts as a transport and dispersion medium for the droplets. The coverage height of the bubble curtain 5 is 1-2 m, and the diameter is 1-2 m. Since the transmission height of the sand flow is generally within a few tens of centimeters, when these sand particles hit the bubble curtain 5, they will consume energy and slow down to fall to the sand surface within a few tens of centimeters to a few meters downwind, thereby forming a shrub sand heap 6, which plays a role in fixing the flowing sand.

[0070] Within the range of the sand surface where the bubble curtain 5 falls, sand-tolerant and saline-alkali-tolerant shrub and grass plants are planted. On the one hand, this can increase their survival rate, and on the other hand, the combination of plant measures and the bubble curtain 5 can play a dual role in sand fixation. With the accumulation of sand from the wet ground surface 22 and the sand accumulation effect brought by plant growth, the shrub sand heap 6 will quickly establish downwind of the bubble curtain. The multiple micro-porous aeration heads or nozzles arranged in a triangular shape can form multiple shrub sand heaps 6 downwind, and gradually form a group of strip-shaped distributed shrub sand heaps 6. In the later period, these shrub sand heaps 6 continue to grow and connect into a piece, forming a large sand accumulation belt. With the passage of time, the wind-blocking and sand-fixing benefits will continue to increase.

[0071] The shrub sand dune 6 forms a natural windproof shape under long-term wind and sand action, the technical scheme artificially and quickly establishes, simulates the curve and slope of the shrub sand dune in the nature, the shrub sand dune 6 is continuously increased with the settlement of sand particles, and the slope of the windward surface 9 of the shrub sand dune 6 is smaller than that of the leeward surface 10; with the passage of time, a large-scale biomimetic wind and sand protection structure is constructed, the wind speed can be effectively reduced, and the flowing sand is fixed, combined with vegetation planting, a protection system with more ecological benefits is formed, therefore, the embodiment simulates the sand-fixing principle of the shrub sand dune in the nature to establish the shrub sand dune 6, so that the wind is blocked and the sand is fixed in a long-term manner close to nature.

[0072] It should be further pointed out that the working principle of the gas-liquid mixture of the spray head of the bubble generator 24 is mainly based on the Venturi effect: when the gas passes through the converging section of the spray head, the flow rate increases, and according to Bernoulli's principle, the pressure is low where the flow rate is high, so a low-pressure area is formed at the throat of the spray head. The liquid is sucked into this low-pressure area because the external pressure is higher than the pressure at the throat. Subsequently, the liquid and the high-speed gas meet in the diffuser section. The high-speed gas impacts and tears the liquid into tiny droplets, fully atomizes the liquid, and uniformly mixes it with the gas. Finally, the gas-liquid mixture is sprayed out of the spray head at high speed, forming a gas-liquid mixed state.

[0073] The principle of the shrub sand dune creating unit 2 for reducing wind speed and settling sand particles is as follows: the bubble curtain 5 mainly uses bubbles to interfere with the airflow. When a large number of bubbles are generated and rise from the device, they will change the motion state of the airflow. On the one hand, the bubble curtain 5 can increase the contact area between the airflow and the liquid (the liquid from which the bubbles are generated). When the airflow passes through the bubble curtain 5, it will continuously collide with these dynamic bubbles. Since the bubbles are spherical, the airflow direction changes when the air flows through the bubble surface, and the originally concentrated airflow is dispersed. On the other hand, the upward movement of the bubbles will cause the surrounding air to produce turbulent convection. This convection can convert part of the horizontal wind kinetic energy into vertical kinetic energy, so that the horizontal wind speed decreases after passing through the bubble curtain 5 area. The shrub sand dune creating unit 2 uses the Bernoulli principle, and the dense bubble curtain rising at high speed will also reduce the air pressure, weaken the lifting force of the airflow on the particles, and promote the particles to settle.

[0074] The present embodiment has a great difference from the principle of the existing technology of spraying measures to fix sand, in which the mist droplets contact the sand particles, increase the overall weight of the sand particles, and promote them to fall. Overall, a continuous bubble curtain 5 is generated in the upwind direction of the protection area by using a spray head and a special device, and these bubble curtains 5 are formed by mixing compressed air and water. When the wind contacts the bubble curtain 5, the breaking and movement of the bubbles can disturb the flow of the wind, consume wind energy, thereby reducing the wind speed and settling the sand particles. In the process of gradually accumulating sand particles, plants are planted to quickly form a shrub sand dune 6.

[0075] The synergy of the shrub sand dune creating unit 2 and the shrub sand dune 6 of the present embodiment has effects that cannot be achieved by the prior art, such as: strong air flow interference ability, when a large number of bubbles are generated and rise, they will collide with the air flow, the spherical structure of the bubbles changes the direction of the air flow passing through the surface of the bubbles, disperses the originally concentrated air flow, reduces the energy and speed of the air flow, and then inhibits the sand carrying capacity of the air flow, thereby playing a significant windproof and sand-fixing role; the rising movement of the bubbles will drive the surrounding air to produce turbulence, converting part of the horizontal wind kinetic energy into vertical kinetic energy, further reducing the horizontal wind speed, promoting the sedimentation of sand particles and other particulate matters, and creating a relatively stable air flow environment for the protected area; the present embodiment also has flexible applicability, flexible installation position, can adapt to various complex terrains and environmental conditions, and can flexibly adjust the direction and angle of the bubble curtain 5 according to the changes of the wind direction and wind speed, so as to achieve the best windproof effect; compared with some large mechanical windproof equipment, the operation of the shrub sand dune creating unit 2 mainly relies on air source (such as air compressor or fan) and liquid source supply, and the energy consumption is relatively low; in some specific scenarios, such as in the photovoltaic field area, water can be used as the liquid medium, which can fully utilize the on-site electric energy and panel cleaning water resources, reduce the dependence on external energy and water resources, achieve the purpose of sand control with water and electricity, and is very suitable for photovoltaic power stations; the present embodiment will not produce a large amount of noise, waste gas or pollutants during operation, and has little impact on the surrounding environment, at the same time, the existence of the bubble curtain 5 will not damage the surrounding ecological environment, but will promote the growth of the surrounding vegetation, which meets the environmental protection requirements of modern society; the structure of the shrub sand dune creating unit 2 is relatively simple, and the equipment manufacturing and installation cost is relatively low, compared with some high-tech windproof technologies (such as intelligent control system, complex mechanical structure, etc.) of the prior art, it has obvious cost advantage; the microporous aeration head or nozzle of the bubble generator 24 will not be blocked in the wind and sand conditions, and will not be suddenly interrupted or out of control due to external factors, thereby providing continuous wind protection for the protected object 21, and the shrub sand dune creating unit 2 will not produce high-speed rotating mechanical parts or high temperature and high pressure during operation, which is relatively safe for personnel and animals and plants.

[0076] The saline-alkali layer in the saline-alkali sandy land weakens the infiltration function of the ground surface 22, and the precipitation can only penetrate a few centimeters in depth, which is difficult for the plant root system to use. The annular plant sand barrier unit 4 in the embodiment includes a plurality of annular plant sand barrier structures 7 and a coiled tube planting structure 8 arranged in an array. The coiled tube planting structure 8 is used at least for receiving the liquid droplets generated by the annular nozzle mechanism 12 and keeping the roots of the plants in the coiled tube planting structure 8 moist. Specifically, the annular plant sand barrier structure 7 includes the annular nozzle mechanism 12 and a composite sand barrier. The composite sand barrier includes a plurality of second plant units 13 and third plant units 16. The third plant units 16 are dead plant branches cut and planted in the annular irrigation area. The second plant units 13 include living xerophytic salt-tolerant plants planted between two adjacent dead plant branches (second plant units 13). The second plant units 13 are planted with plant seeds including shrub and grass seeds. The second plant units 13 are planted in the annular irrigation area around the annular nozzle mechanism 12. The coiled tube planting unit 8 is arranged in the soil under the ground surface 22 and covers the roots of each second plant unit 13. The coiled tube planting unit 8 is used at least for promoting water infiltration in the vertical direction and water retention in the horizontal direction. The coiled tube planting structure 8 specifically includes a plurality of coiled tube-shaped soil carriers 14. The coiled tube-shaped soil carrier 14 is formed by rolling a rectangular geotextile about any side edge and has a cylindrical structure divided into a plurality of filling layers 15 in the radial direction. Planting material is filled in the plurality of filling layers 15 arranged in the radial direction of the coiled tube-shaped soil carrier 14. The surface of the rectangular geotextile has a plurality of pores, and the surface porosity of the rectangular geotextile is 30-50%. The height of the coiled tube-shaped soil carrier 14 is 30-60 cm, and the diameter is 12-40 cm. The coiled tube-shaped soil carrier 14 has 3-5 filling layers 15, and the thickness of each filling layer 15 is 2-4 cm. The planting material is a moist aggregate formed by mixing humus soil, sandy soil, and decomposed sheep manure and water. The coiled tube-shaped soil carrier 14 has a cylindrical shape, and the planting material is wrapped in the coiled tube-shaped soil carrier 14. The plant seeds and / or plant seedlings of the second plant units 13 are arranged in the planting material. The irrigation water provided by the annular nozzle mechanism 12 can quickly infiltrate the planting material around the plant roots along the vertical side wall of the rectangular geotextile and additionally play a role in soil multi-moistening in the horizontal direction. Overall, the coiled tube planting structure 8 has the functions of vertical water infiltration and horizontal water retention, which can promote the survival and growth of the plant seedlings in the seedling stage.

[0077] It should be noted that the ring-shaped nozzle mechanism 12 includes but is not limited to a ring-shaped nozzle, the ring-shaped nozzle mechanism 12 is erected at the center point position, the humic acid is dissolved in water to prepare a solution, and the solution is sprayed to the annular area by the ring-shaped nozzle irrigation method, the second plant unit 13 is arranged in the annular area, the water droplet falling area of the ring-shaped nozzle is annular, the edge diameter of the annular area is 1-3m, and the annular width is 20-50cm. The ring-shaped nozzle is arranged in a triangular shape, and the nozzle spacing is 1-3m. Compared with general large-area sprinkling irrigation, the irrigation area of this technology is annular, which is more concentrated, so that the irrigation water can more accurately act on the plant root system, improve the utilization rate, and the irrigation water provided by the ring-shaped nozzle mechanism 12 is dissolved with humic acid, which can reduce the soil salinity while irrigating the second plant unit 13, and can save water.

[0078] The specific setting method of the second plant unit 13 is as follows: the humus soil, sand, decomposed sheep manure and water are uniformly mixed to form a wet agglomerate form of planting material, the planting material is rolled in a rectangular geotextile to form a roll-shaped roll planting unit 8, and the root system of the xerophyte shrub seedlings or the grass seed of the second plant unit 13 is wrapped in the planting material inside the roll planting unit 8. One roll planting unit 8 can wrap 2-5 shrubs or 2-5 grams of seeds, such as reed, salt sedge, casuarina, haloxylon, nitraria, calligonum, medlar, lycium ruthenicum, alfalfa, and sand dune plant seedlings or seeds. When the seeds and / or plant seedlings of the second plant unit 13 are wrapped in the roll planting unit 8, the root system is kept flush with the top of the roll planting unit 8, that is, the soil surface, so that the second plant unit 13 maintains an appropriate depth.

[0079] The third plant unit 16 in the ring-shaped plant sand barrier structure 7 is a dead plant branch cut and inserted in the ring-shaped irrigation area, the third plant unit 16 is cut and inserted in the gap between every two second plant units 13, that is, the third plant unit 16 is earlier than the second plant unit 13 in time line, the third plant unit 16 is used for sand fixation in the early stage, and the third plant unit 16 forms a ring-shaped living plant and branch composite ring-shaped plant sand barrier unit with the growth of the second plant unit 13 in the later stage, which has fast and high sand fixation effect.

[0080] The second plant unit 13 includes any one of reed, salt sedge, casuarina, haloxylon, nitraria, calligonum, medlar, lycium ruthenicum, alfalfa, and sand dune plant, which are all salt-tolerant shrub and grass plants, and the third plant unit 16 includes plant branches or plants that are easily obtained locally.

[0081] The injection type saline soil treatment unit 17 of the embodiment is arranged at the downwind of the annular plant sand barrier unit 4, and is in a plurality of independent strip regions and arranged in parallel along the main wind direction 1. Specifically, the injection type saline soil treatment unit 17 comprises a fourth plant unit 20, an aeration unit and a material injection unit. The aeration unit can generate the fissure zone 18 in the soil. The material injection unit is used for injecting the material into the fissure zone 18. The material is a mixture of humic acid, mature farmyard manure, organic matter, gypsum and microbial agent, and the particle size is 1-4 mm. According to the degree of saline soil and the growth cycle of crops, the saline soil improvement material 19 is filled in the underground fissure zone 18 for 2-3 times per year. The fourth plant unit 20 is planted in the strip region and used for preventing wind and fixing sand. The fourth plant unit is a salt-tolerant plant planted in the underground fissure zone 18 in the injection type saline soil treatment unit 17.

[0082] It should be noted that the aeration unit includes but is not limited to a soil aerator. The soil is first treated by the soil aerator for multi-point aeration. The saline soil is loosened and consolidated. The material particles are injected into the underground fissure zone 18 formed after aeration by the material injection unit. The particles will chemically react with the saline components in the soil to reduce the salinity, increase the soil aggregation and improve the saline soil. The above measures are combined with the fourth plant unit 20 planted with salt-tolerant plants to achieve better effects of improving the saline soil, fixing sand, improving the soil aeration, increasing the soil microbial activity, improving the soil structure and enhancing the self-purification capacity of the soil. The soil improvement process needs to be performed for multiple times. The multi-point aeration and filling of the saline soil improvement material in the underground fissure zone can be performed for 2-3 times per year. The degree of saline soil and the growth cycle of crops are appropriately adjusted.

[0083] Further, the fissure zone 18 formed in the soil by the aeration process of the aeration unit can block the capillary action to some extent and inhibit the migration and accumulation of underground saline water to the surface 22, so that the salinity of the surface soil 22 can be effectively reduced. Meanwhile, the fissure zones 18 are beneficial to the infiltration of rainwater or irrigation water, so that the accumulated saline on the surface 22 is washed and discharged to the deeper soil, which further reduces the salinity of the surface soil and promotes the enrichment of the saline in the deep soil. The injection of the above material particles into the fissure zone 18 can improve the deep saline soil and is beneficial to the growth of plant roots. Therefore, the injection type saline soil treatment unit 17 of the embodiment can reduce the salinity of the surface soil, the deep soil and the whole soil layer, and has the advantages of complete improvement, high efficiency, simple construction and green environmental protection.

[0084] The specific principle that the components in the material can reduce the saline-alkali content of the soil 22 is explained as follows: humic acid can be used to improve saline-alkali soil. Humic acid is an organic colloid that can combine with calcium ions in the soil to form flocculent gel. This gel can cement soil particles together, increase the aggregation of the soil, and improve the soil structure. It has a large number of negative charges that can adsorb sodium ions in the soil, reduce the degree of soil alkalization, and also react with sodium carbonate, sodium bicarbonate, and other alkaline substances in the saline-alkali soil to reduce the harm of alkaline substances to plants. At the same time, humic acid can improve the water and fertilizer retention capacity of the soil, promote the growth of plant roots, and enhance the stress resistance of plants, which is conducive to the better growth of plants in saline-alkali environments. The dosage of solid humic acid per mu is about 200-500 kg; Gypsum (calcium sulfate) can be used to neutralize the salt content of saline-alkali soil. It can react with alkaline substances such as sodium carbonate and sodium bicarbonate in the soil to reduce the pH value of the soil. For example, in saline-alkali soil with strong alkalinity, calcium ions in gypsum can replace sodium ions adsorbed by soil colloids, and sodium ions combine with sulfate ions to form sodium sulfate, which is washed away with water, thereby reducing the salt content; Farmyard manure (including livestock and poultry manure, compost, etc.) contains a large amount of organic matter. These organic matters can produce organic acids during the decomposition process, which can neutralize the alkaline substances in the soil. Moreover, organic fertilizer can improve the soil structure and increase the porosity of the soil, which is conducive to the leaching of salt. For example, after applying decomposed sheep manure to saline-alkali soil, the degree of soil salinity and alkalinity will decrease after a period of time, and the soil will become more porous; Microbial agents contain a variety of beneficial microorganisms, such as Bacillus subtilis and Bacillus licheniformis. These microorganisms can decompose organic matter in the soil and produce acidic metabolites to neutralize the alkalinity of saline-alkali soil. Moreover, microbial agents can activate nutrients in the soil and promote the absorption of nutrients by plants, which is conducive to the growth of plants in saline-alkali environments and indirectly improves the conditions of saline-alkali soil.

[0085] Example 2

[0086] The embodiment provides a saline-alkali sandy land comprehensive treatment method based on a bubble curtain, and the treatment method is specifically as follows: a shrub sand dune creating unit, a roll planting unit, a ring-shaped plant sand barrier unit and an injection type saline-alkali treatment unit are arranged on a wind-sand-saline-alkali land to be treated along a main wind direction; a bubble curtain is generated by a bubble curtain generating module in the shrub sand dune creating unit, and a salt-tolerant shrub and grass plant is planted in a sand surface range where the bubble curtain falls, so as to promote wind and sand accumulation, thereby forming a shrub sand dune in a downwind direction of the bubble curtain; the third plant unit 16 in the ring-shaped plant sand barrier structure 7 is a dead plant branch grafted in the ring-shaped irrigation area, and the third plant unit 16 is grafted in the gap between every two second plant units 13, that is, the third plant unit 16 is earlier than the second plant unit 13 in a time line, the third plant unit 16 is used for sand fixation in an early stage, and with the growth of the second plant unit 13, a ring-shaped living plant and branch composite ring-shaped plant sand barrier unit is formed, sand fixation is effective and efficient; and at least a salt-tolerant plant is planted in the underground fissure area 18 in the injection type saline-alkali treatment unit, and according to a soil saline-alkali degree and a crop growth cycle, saline-alkali soil improvement materials are filled in the underground fissure area 18 for 2-3 times per year.

[0087] The embodiment utilizes the bubble curtain at the upwind position to establish a shrub sand dune group to block and fix wind and sand, and gradually changes a saline-alkali land surface 22 into a sand accumulation land surface 22, the capillary action between sand particles is weaker than that in the saline-alkali soil, which will inhibit the upward movement of salt and the accumulation process in the surface layer, and reduce the surface soil salinity. The shrub sand dune rapidly established at the downwind position of the bubble curtain will effectively fix the flowing sand, and when the shrub sand dune group continues to accumulate sand and expand, the effect of sand fixation will be better after forming a large sand blocking belt.

[0088] It should be noted that the embodiment uses high-speed gas to impact liquid, and the liquid is impacted and torn to form tiny liquid droplets, which are uniformly mixed with the liquid, and the liquid is sprayed out through a high-speed nozzle to form bubbles and form a bubble curtain.

[0089] The treatment method of the embodiment further includes the following content: the ring-shaped nozzle mechanism is used to spray humic acid solution to the ground of the wind-sand-saline-alkali land to form a ring-shaped irrigation area, and plant branches are grafted and salt-tolerant sand plants are planted in the ring-shaped irrigation area to form a composite sand barrier, thereby forming a ring-shaped plant sand barrier unit, that is, the ring-shaped nozzle mechanism is erected at the center point position, the humic acid is dissolved in water to prepare a solution, and the solution is sprayed to the ring-shaped irrigation area by the ring-shaped nozzle irrigation, the irrigation area formed by the treatment method of the embodiment is in a ring shape, the humic acid can be more concentrated and more accurately act on the plant root system, the utilization rate is improved, and the irrigation water provided by the ring-shaped nozzle mechanism 12 is dissolved with humic acid, which can reduce the soil salinity while irrigating the second plant unit 13, and can save water.

[0090] And, the soil aerator is used to aerate the stratum of the aeolian saline-alkali land at multiple points, loosen the saline-alkali soil, and form an underground fissure area 18; the soil aerator is used to inject the granular saline-alkali soil improvement material into the underground fissure area 18, thereby forming an injection type saline-alkali treatment unit.

[0091] Preferably, the coil planting structure 8 wrapped around the plant roots is arranged in the circular area sprayed by the annular spray head, which can promote vertical water infiltration and horizontal water retention.

[0092] It should be further noted that the injection of the material into the ground surface 22 reduces the saline-alkali content of the soil of the ground surface 22, while the plants continue to be planted at the leeward of the plants, and the saline-alkali treatment unit continues to expand towards the leeward, thereby promoting the growth of the plants by reducing the saline-alkali content of the soil of the ground surface 22. The injection of the material into the ground surface 22 causes little disturbance to the ground surface 22, which can reduce the saline-alkali content of the surface layer, deep layer and whole soil layer, and improve the saline-alkali soil completely, efficiently, simply, greenly and at low cost. In combination with the planting of salt-tolerant plants, the saline-alkali soil can be better improved and the drifting sand can be better fixed.

[0093] The treatment methods of the three units in the embodiment have the dual effects of sand fixation and saline-alkali soil improvement, and are suitable for the improvement and protection of saline-alkali and sandy land. In addition, since the bubble curtain 5 is used to block the wind and fix the sand in the embodiment, no high vertical solid sand barrier in the prior art is included, and no shading of the photovoltaic panel is caused, so the wind and sand protection in the interior of the photovoltaic power plant array area is more suitable.

[0094] It should be understood that the above embodiments are only for illustrating the technical concepts and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A comprehensive management system for saline-alkali sandy land, characterized in that, The sand dune creation unit (2), the ring-shaped plant sand barrier unit (4) and the injection type saline-alkali treatment unit (17) are arranged in sequence along the main wind direction (1). The sand dune creation unit (2) is used for creating a sand dune (6) on the wind-sand-saline-alkali land, and comprises at least one bubble curtain (5) generating module arranged on the wind-sand-saline-alkali land, for generating a bubble curtain (5) above the ground surface (22) of the wind-sand-saline-alkali land, the bubble curtain (5) being a high-speed gas-liquid mixed flow in the shape of a solid fan or an inverted cone, liquid being dispersed in the gas in the form of small droplets, the high-speed gas playing a role of conveying and dispersing the droplets, the distribution height range of the bubble curtain (5) in the vertical direction at least partially overlapping the distribution height range of the wind-sand flow flowing above the ground surface (22) of the wind-sand-saline-alkali land, the bubble curtain (5) being formed by mixing compressed air and water, when the wind contacts the bubble curtain, the rupture and movement of the bubbles can disturb the flow of the wind, consume the wind energy, and the sand surface range on which the bubble curtain (5) falls is used for planting sand-tolerant saline-alkali shrub and grass plants; The ring-shaped plant sand barrier unit (4) comprises a plurality of ring-shaped plant sand barrier structures (7) and a plurality of reel planting units (8), the ring-shaped plant sand barrier structure (7) comprising a ring-shaped nozzle mechanism (12) and a composite sand barrier, the ring-shaped nozzle mechanism (12) being arranged above the ground surface (22) of the wind-sand-saline-alkali land, and the water droplet falling surface of the ring-shaped nozzle mechanism (12) being annular, for forming an annular irrigation area on the ground of the wind-sand-saline-alkali land, the composite sand barrier comprising dead plant branches inserted in the annular irrigation area and live sand-tolerant saline-alkali plants planted between two adjacent dead plant branches, and the reel planting unit (8) being distributed below the ground surface (22) of the live sand-tolerant saline-alkali plants in the annular irrigation area, and the top end being flush with the ground surface (22), the reel planting unit (8) comprising a reel-shaped soil carrier (14) and plant seeds and / or plant seedlings, the reel-shaped soil carrier (14) comprising a reel formed by winding geotextile and planting material wound in the reel, and the root system of the plant seeds and / or plant seedlings being distributed in the planting material; The injection type saline-alkali treatment unit (17) comprises a plurality of underground fissure zones (18) distributed in the stratum of the wind-sand-saline-alkali land, the underground fissure zones (18) being filled with saline-alkali soil improvement materials (19), and the injection type saline-alkali treatment unit (17) being formed by the following method: using a soil aerator to perform multi-point aeration treatment on the stratum of the wind-sand-saline-alkali land, to loosen the saline-alkali soil, form the underground fissure zones, and inject granular saline-alkali soil improvement materials into the underground fissure zones by using the soil aerator, thereby forming the injection type saline-alkali treatment unit. Each of the shrub-sand heap creating unit (2), the ring-shaped plant sand barrier unit (4) and the injection type saline-alkali treatment unit (17) is distributed on a corresponding functional strip, a plurality of the functional strips are arranged in parallel, a blank area is arranged between adjacent functional strips, and the extension direction of the functional strips is perpendicular to the main wind direction (1), and a protection object (21) is arranged at the downwind direction of the injection type saline-alkali treatment unit (17); the bubble curtain and the ring-shaped spray head both increase the air and soil humidity at the downwind direction, and promote the growth of plants in the ring-shaped plant sand barrier unit and the injection type saline-alkali treatment unit, respectively.

2. The saline-alkali sandy land comprehensive management system according to claim 1, characterized in that: The width of the blank area is 10-20 m.

3. The system for comprehensive management of saline-alkali sandy land according to claim 1, characterized in that: The bubble curtain generating module comprises a bubble generator (24), the bubble generator (24) is in communication with a gas supply mechanism and a liquid supply mechanism, respectively, and the gas supply mechanism is in communication with a triggering mechanism.

4. The system for comprehensive management of saline-alkali sandy land according to claim 3, characterized in that: The bubble curtain generating module is connected with a support structure and is installed above the ground surface (22) of the aeolian saline-alkali soil through the support structure.

5. The system for comprehensive treatment of saline-alkali sandy land according to claim 3, characterized in that: The covering height of the bubble curtain (5) is 1-2 m, and the diameter is 1-2 m.

6. The saline-alkali sandy land comprehensive management system according to claim 3, characterized in that: The bubble generator (24) comprises a Venturi spray head, and the water outlet position of the Venturi spray head is 5-20 cm above the leakage ground surface (22).

7. The saline-alkali sandy land comprehensive management system according to claim 6, characterized in that: The bubble generator (24) is a plurality of, each bubble generator (24) comprises a Venturi spray head, and a plurality of the Venturi spray heads are arranged in a triangle shape on the upwind ground surface (22) of the aeolian saline-alkali soil, and the spacing between adjacent spray heads is 2-5 m.

8. The saline-alkali sandy land comprehensive management system according to claim 7, characterized in that: The spray direction of the Venturi spray head of the bubble generator (24) is towards the main wind direction (1) and is arranged at an angle of 50-90° upwardly.

9. The system for comprehensive management of saline-alkali sandy land according to claim 6, characterized in that: The shrub-sand heap creating unit (2) further comprises a triggering mechanism, which is used at least to start the bubble generator (24) in the case of wind-sand flow.

10. The system for comprehensive management of saline-alkali sandy land according to claim 3, characterized in that: The plant material is in the form of wet agglomerates and comprises uniformly mixed humus soil, sandy soil, decomposed sheep manure and water.

11. The system for comprehensive management of saline-alkali sandy land according to claim 10, characterized in that: The roll is wrapped by a rectangular geotextile, and the whole is in the shape of a cylinder, the height of the roll is 30-60 cm, and the diameter is 12-40 cm.

12. The system for comprehensive management of saline-alkali sandy land according to claim 10, characterized in that: The roll is distributed with 3-5 layers of plant material, and the thickness of each layer of plant material is 2-4 cm.

13. The system for comprehensive management of saline-alkali sandy land according to claim 11, characterized in that: The porosity of the geotextile is 30-50%.

14. The system for comprehensive management of saline-alkali sandy land according to claim 11, characterized in that: The length of the geotextile is 30-150 cm.

15. The system for comprehensive management of saline-alkali sandy land according to claim 10, characterized in that: Each roll is distributed with 2-5 grams of plant seeds or 2-5 plant seedlings.

16. The saline-alkali sandy land comprehensive management system according to claim 15, characterized in that: The plant seeds comprise shrub and grass seeds.

17. The saline-alkali sandy land comprehensive management system according to claim 3, characterized in that: The outer diameter of the ring-shaped irrigation area is 1-3 m, and the width of the circular ring is 20-50 cm.

18. The saline-alkali sandy land comprehensive management system according to claim 17, characterized in that: A plurality of the ring-shaped spray head mechanisms (12) are arranged in a triangle shape, and the spacing between adjacent spray heads is 1-3 m.

19. The system for comprehensive management of saline-alkali sandy land according to claim 17, characterized in that: The salt-tolerant plants include salt-tolerant shrub and grass plants.

20. The system for comprehensive management of saline-alkali sandy land according to claim 18, characterized in that: The ring-shaped spray head mechanism (12) is used at least to spray humic acid solution in the ring-shaped irrigation area.

21. The system for comprehensive management of saline-alkali sandy land according to claim 3, characterized in that: The depth of the underground fissure area (18) is 50-100 cm, the diameter is 1-3 m, and the width of the overlapping area of adjacent underground fissure areas is 0-3 m.

22. The saline-saline sandy land comprehensive management system according to claim 21, characterized in that: The saline-alkali soil improvement material (19) is in the form of particles, and the particle size is 1-4 mm.

23. The saline-saline sandy land comprehensive management system according to claim 21, characterized in that: The saline-alkali soil improvement material (19) comprises uniformly mixed humic acid, mature farmyard manure, organic matter, gypsum and microbial inoculum.

24. A comprehensive management method of saline-alkali sandy land, characterized in that, The method is implemented based on the saline-alkali sandy land comprehensive treatment system according to any one of claims 1-23, and the method comprises: The gully-ridge sand dune creating unit (2) is arranged in the main wind direction (1) on the wind-sand saline land to be treated, followed by the ring-shaped plant sand barrier unit (4) and the injection-type saline-alkali treatment unit (17); The bubble curtain (5) is generated by the bubble curtain generating module in the gully-ridge sand dune creating unit (2), and the salt-tolerant shrub and grass plants are planted in the sand surface range where the bubble curtain (5) falls, so as to promote the wind-sand accumulation and fixation, thereby forming the gully-ridge sand dune (6) in the downwind direction of the bubble curtain (5); The plant seeds and / or plant seedlings in the reel planting unit (8) are allowed to grow; The plants in the ring-shaped plant sand barrier unit (4) are allowed to grow; The salt-tolerant plants are planted in the underground fissure area in the injection-type saline-alkali treatment unit (17), and the saline-alkali soil improvement material (19) is filled in the underground fissure area, and the multi-point aeration is performed 2-3 times per year according to the soil saline-alkali degree and the crop growth cycle.

25. The method according to claim 24, wherein, The method specifically comprises: The ring-shaped irrigation area is formed by spraying the humic acid solution to the ground of the wind-sand saline land by at least the ring-shaped spray head mechanism (12), and the dead plant branches are cut and the living salt-tolerant plants are planted in the ring-shaped irrigation area to form the composite sand barrier, thereby forming the ring-shaped plant sand barrier unit (4).

26. The method according to claim 24, wherein the saline-alkali sandy land is a saline-alkali sandy land with a salinity of 0.1 to 0.3 dS / m. The method specifically comprises: The soil aeration machine is used to perform the multi-point aeration treatment on the stratum of the wind-sand saline land, so as to loosen the saline-alkali soil and form the underground fissure area; The granular saline-alkali soil improvement material (19) is injected into the underground fissure area by the soil aeration machine, thereby forming the injection-type saline-alkali treatment unit (17).

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