Saline-alkali soil comprehensive improvement system based on sand doping and straw returning

Abstract

The invention provides a comprehensive saline-alkali soil improvement system based on sand doping and straw returning, which comprises a plurality of improvement units arranged in saline-alkali soil, and the plurality of improvement units are communicated with one another through communicating pipelines; the improvement unit is composed of a bottom improvement bag and an improvement sleeve, the bottom improvement bag is further filled with a construction waste mixing layer, an opening is formed in the top face of the bottom improvement bag, the improvement sleeve is connected in the opening in a sleeved mode, and the improvement sleeve is filled with a sand mixing layer; a straw mixing layer covers the sand mixing layer, and the straw mixing layer is flush with the surface layer of the saline-alkali soil. In the later period of use, the bottom improvement bag can be naturally degraded, so that a construction waste mixing layer in the bottom improvement bag is dispersed, the effect of circumferential improvement radiation can be achieved, overall saline-alkali soil improvement can be driven through regional saline-alkali soil improvement, the cost investment of saline-alkali soil improvement can be reduced, and the economic efficiency of saline-alkali soil improvement can be improved conveniently.

Description

Technical Field

[0001] The present invention belongs to the technical field of saline-alkali land improvement systems, and particularly relates to a comprehensive saline-alkali land improvement system based on sand mixing and straw returning to the field. Background Art

[0002] Saline-alkali land improvement refers to a process of reducing the soil salt content, improving the soil structure, and increasing the soil fertility through a series of measures to make it suitable for agricultural production or ecological restoration. Most of the saline-alkali land improvement is to first lower the groundwater level through a drainage system to reduce the salt rising, and then increase the soil permeability to promote the water-salt migration. Then, the soil fertility is increased by adding fertilizers to promote the microbial activities, or the soil environment is improved by using salt-tolerant plants or microorganisms.

[0003] However, in the process of comprehensive saline-alkali land improvement, due to the large investment in finished products such as fertilizers and biological agents, the cost of saline-alkali land improvement increases, affecting the economic benefits after saline-alkali land improvement.

[0004] Based on this, a comprehensive saline-alkali land improvement system based on sand mixing and straw returning to the field is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a comprehensive saline-alkali land improvement system based on sand mixing and straw returning to the field to solve the problems raised in the above background art in view of the deficiencies of the above prior art.

[0006] To solve the above technical problem, the technical solution adopted by the present invention is:

[0007] In a first aspect, a comprehensive saline-alkali land improvement system based on sand mixing and straw returning to the field includes a plurality of improvement units arranged in the saline-alkali land, and the plurality of improvement units are connected to each other through a communication pipeline;

[0008] The improvement unit is composed of a bottom improvement bag and an improvement sleeve. The bottom improvement bag is a square bag body, and a construction waste mixed layer is filled in the bottom improvement bag;

[0009] An opening is provided on the top surface of the bottom improvement bag, and an improvement sleeve is sleeved in the opening. A sand mixing layer is filled in the improvement sleeve;

[0010] A layer of straw mixed layer is covered on the sand mixing layer, and the straw mixed layer is flush with the surface layer of the saline-alkali land.

[0011] As a further illustration of the present invention, the bottom improved bag is made of a waterproofed degradable starch-based material. Connection ports are provided in four directions on the outer periphery of the bottom improved bag. The bottom surfaces of the bottom improved bag are on the same horizontal plane at the adjacent two connection ports to which the ports of the communication pipeline are connected. The water that penetrates to the inner bottom of the bottom improved bag can be circulated through the communication pipeline, thereby improving the utilization efficiency of water resources.

[0012] As a further illustration of the present invention, the communication pipeline is specifically a pipe made of polylactic acid, and the inner diameter of the communication pipeline is set between 3 - 5 cm.

[0013] As a further illustration of the present invention, the construction waste mixed layer is specifically made by mixing construction waste and saline-alkali soil in the saline-alkali land, and the mixing ratio of the construction waste to the saline-alkali soil is 1:3 - 5.

[0014] As a further illustration of the present invention, the construction waste is made by mixing crushed bricks and concrete blocks in equal proportion, and the particle size of the construction waste is not greater than 3 cm.

[0015] As a further illustration of the present invention, the improved sleeve is specifically a trumpet-shaped sleeve made of polylactic acid. The smaller end of the bottom aperture of the improved sleeve extends 8 - 10 cm into the construction waste mixed layer, and the filling height of the sand-mixed layer in the improved sleeve is 5 - 8 cm less than the maximum filling height of the improved sleeve.

[0016] As a further illustration of the present invention, the sand-mixed layer is made by mixing sandy soil and saline-alkali soil, and the mixing ratio of the sandy soil to the saline-alkali soil is 1:3 - 5.

[0017] As a further illustration of the present invention, the straw mixed layer is made by mixing crushed straw and saline-alkali soil. The maximum length of the crushed straw does not exceed 5 cm. The depth of the straw mixed layer is set at 15 - 20 cm, and the depths of the construction waste mixed layer and the sand-mixed layer are not less than the depth of the straw mixed layer.

[0018] As a further illustration of the present invention, the maximum cross-sectional area of the sand-mixed layer is not less than the cross-sectional area of the construction waste mixed layer, and the cross-sectional area of the straw mixed layer is greater than the maximum cross-sectional area of the sand-mixed layer.

[0019] Second aspect, a method for using a saline-alkali land comprehensive improvement system based on sand mixing and straw returning to the field, comprising the following steps:

[0020] S1. Excavate multiple improvement trenches in the saline-alkali land at intervals of 80 - 120 cm, excavate the bottom surfaces of the multiple improvement trenches to the same horizontal plane, and arrange connecting pipelines at the bottoms of adjacent improvement trenches. The depth of the improvement trenches is greater than the depth of the improvement units.

[0021] S2. Lay the bottom improvement bags of the salt improvement units on the inner bottom surface of the improvement trenches, and connect the ports of the connecting pipelines to the connection ports of the bottom improvement bags to complete the connection between adjacent bottom improvement bags.

[0022] S3. Fill the bottom improvement bags with the construction waste mixed layer. Stop when the construction waste mixed layer fills to the opening of the bottom improvement bags, and backfill the gap between the outer periphery of the bottom improvement bags and the improvement trenches with saline-alkali soil so that the outer periphery of the bottom improvement bags contacts the saline-alkali soil.

[0023] S4. Insert the smaller-diameter end of the bottom of the improvement sleeve into the construction waste mixed layer to complete the installation of the improvement sleeve. Then backfill the gap between the outer periphery of the improvement sleeve and the improvement trenches with saline-alkali soil so that the outer periphery of the improvement sleeve contacts the saline-alkali soil, and then fill the improvement sleeve with a sand-mixed layer.

[0024] S5. Level the top surface of the sand-mixed layer and then fill the straw mixed layer. After the straw mixed layer is filled, conduct irrigation treatment in the area of the straw mixed layer. Irrigate 10 - 12 kg of irrigation water per square meter of the straw mixed layer. After irrigation, conduct film mulching to conserve soil moisture on the surface of the straw mixed layer, and then plant improved crops to complete the saline-alkali land improvement operation.

[0025] The present invention has the following advantages compared with the prior art:

[0026] 1. The present invention sets multiple improvement units in the saline-alkali land. The improvement units are composed of bottom improvement bags and improvement sleeves. The bottom improvement bags are square bag bodies, and the bottom improvement bags are made of waterproofed degradable starch-based materials. In the later stage of use, they can naturally degrade, causing the construction waste mixed layer in the bottom improvement bags to disperse, thereby playing a role of circumferential improvement radiation. Thus, it can drive the improvement of the overall saline-alkali land through regional saline-alkali land improvement, reduce the input cost of saline-alkali land improvement, and facilitate improving the economic efficiency of saline-alkali land improvement.

[0027] 2. In the present invention, connection ports are provided in four directions on the outer periphery of the bottom improvement bags. The ports of the connecting pipelines are connected to two adjacent connection ports. The bottom surfaces of the bottom improvement bags are set on the same horizontal plane. Through the connecting pipelines, the water that penetrates to the bottom of the bottom improvement bags can circulate, thereby improving the utilization efficiency of water resources.

[0028] 3. In the present invention, a construction waste mixed layer is further filled in the bottom improvement bag. The construction waste mixed layer is specifically made by mixing construction waste and saline-alkali soil in the saline-alkali land. The construction waste is made by mixing crushed bricks and concrete blocks in equal proportions. Mixing bricks and concrete blocks with saline-alkali soil can not only achieve the reuse of bricks and concrete blocks, reduce waste accumulation, realize resource recycling, and reduce improvement costs, but also improve soil permeability and drainage performance of the saline-alkali land by bricks and concrete blocks.

[0029] 4. A modification sleeve is sleeved inside the opening of the bottom improvement bag in the present invention. The modification sleeve is filled with a sand-mixed layer. The modification sleeve is specifically a horn-shaped sleeve made of polylactic acid. The horn-shaped sleeve can increase the surface area of use of the improvement unit, so as to increase the improvement range. The smaller end of the bottom hole diameter of the modification sleeve extends 8-10 cm into the construction waste mixed layer, which can improve the stability of the modification sleeve during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 is a top view of the use state of the present invention.

[0032] Description of the reference numerals:

[0033] 1 - improvement unit; 2 - saline-alkali land; 3 - connecting pipeline; 4 - bottom improvement bag; 41 - connection port; 5 - construction waste mixed layer; 6 - modification sleeve; 7 - sand-mixed layer; 8 - straw mixed layer; 9 - improved crop; 91 - crop root system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] As Figure 1 and Figure 2 shown, the present invention provides a technical solution: a comprehensive improvement system for saline-alkali land based on sand mixing and straw returning to the field, including a plurality of improvement units 1 arranged in the saline-alkali land 2. The plurality of improvement units 1 are connected to each other through a connecting pipeline 3. Through the connecting pipeline 3, the water flow at the bottom of the improvement unit 1 can be completed, so as to maximize the utilization rate of water resources and avoid the phenomenon of uneven distribution of water resources;

[0036] The improved unit 1 is composed of a bottom improvement bag 4 and an improvement sleeve 6. The bottom improvement bag 4 is a square bag body, which is made of a waterproofed and degradable starch-based material. In the later stage of use, it can naturally degrade, causing the construction waste mixed layer 5 in the bottom improvement bag 4 to disperse, so as to form a circumferential improvement radiation effect, thereby driving the overall improvement of saline-alkali land through regionalized saline-alkali land improvement, reducing the input cost of saline-alkali land improvement, and facilitating the improvement of the economic efficiency of saline-alkali land improvement.

[0037] Connection ports 41 are provided in four directions on the outer periphery of the bottom improvement bag 4. The ports of the communication pipeline 3 are connected to two adjacent connection ports 41. The bottom surface of the bottom improvement bag 4 is on the same horizontal plane. Through the communication pipeline 3, the water seeping to the bottom of the bottom improvement bag 4 can circulate, thereby improving the utilization efficiency of water resources.

[0038] The communication pipeline 3 is specifically a pipe made of polylactic acid. The communication pipeline 3 can also naturally degrade in the later stage of use, reducing the occupation of space by the communication pipeline 3, thereby reducing waste of resources.

[0039] The inner diameter of the communication pipeline 3 is set between 3 - 5 cm, which can not only complete the initial waterway connection operation, but also avoid the phenomenon of water seepage due to too large a diameter of the communication pipeline in the middle section, improving the service life of the communication pipeline.

[0040] A construction waste mixed layer 5 is also filled in the bottom improvement bag 4. The construction waste mixed layer 5 is specifically made by mixing construction waste and saline-alkali soil in the saline-alkali land 2. The construction waste is made by mixing crushed bricks and concrete blocks in equal proportion. The particle size of the construction waste is not more than 3 cm. Mixing bricks and concrete blocks with saline-alkali soil can not only complete the reuse of bricks and concrete blocks, reduce waste accumulation, realize resource recycling, and reduce the improvement cost, but also improve the soil permeability and the drainage performance of the saline-alkali land by bricks and concrete blocks.

[0041] The mixing ratio of the construction waste to the saline-alkali soil is 1:3 - 5, which can maximize the utilization rate of the construction waste.

[0042] An opening is provided on the top surface of the bottom improvement bag 4, and an improvement sleeve 6 is sleeved in the opening. The improvement sleeve 6 is filled with a sand-mixed layer 7. The improvement sleeve 6 is specifically a horn-shaped sleeve made of polylactic acid. The horn-shaped sleeve can increase the surface area of use of the improved unit, thereby increasing the improvement range. The smaller-diameter bottom end of the improvement sleeve 6 extends 8 - 10 cm into the construction waste mixed layer 5, which can improve the stability of the improvement sleeve 6 during use.

[0043] The sand-mixed layer 7 is made of a mixture of sandy soil and saline-alkali soil. The mixing ratio of the sandy soil to the saline-alkali soil is 1:3 - 5. The filling height of the sand-mixed layer 7 in the improvement sleeve 6 is 5 - 8 cm less than the maximum filling height of the improvement sleeve 6, which is convenient for improving the use efficiency of the sand-mixed layer 7.

[0044] A straw mixed layer 8 is also covered on the sand-mixed layer 7. The straw mixed layer 8 is flush with the surface layer of the saline-alkali land 2. The straw mixed layer 8 is made of crushed straw and saline-alkali soil. The maximum length of the crushed straw does not exceed 5 cm. The depth of the straw mixed layer 8 is set at 15 - 20 cm. The depths of the construction waste mixed layer 5 and the sand-mixed layer 7 are not less than the depth of the straw mixed layer 8.

[0045] During specific use, an appropriate amount of microbial inoculum is mixed in the straw mixed layer 8, which can accelerate the decomposition of the straw, thereby improving the improvement efficiency of the saline-alkali land 2.

[0046] The maximum cross-sectional area of the sand-mixed layer 7 is not less than the cross-sectional area of the construction waste mixed layer 5. The cross-sectional area of the straw mixed layer 8 is larger than the maximum cross-sectional area of the sand-mixed layer 7, which can ensure the stability of the improvement unit 1 while maximizing the utilization of the improvement unit, facilitating the integration of adjacent improvement units 1 in a local area during the improvement process to complete the improvement of the rectified saline-alkali area.

[0047] The usage method of the above saline-alkali land comprehensive improvement system based on sand mixing and straw returning to the field includes the following steps:

[0048] S1. Excavate a plurality of improvement trenches in the saline-alkali land 2 at an interval of 80 - 120 cm, excavate the bottom surfaces of the plurality of improvement trenches to the same horizontal plane, and arrange a communication pipeline 3 at the bottom of adjacent improvement trenches. The depth of the improvement trench is greater than the depth of the improvement unit 1.

[0049] S2. Lay the bottom improvement bag 4 of the salt improvement unit 1 on the inner bottom surface of the improvement trench, and connect the port of the communication pipeline 3 to the connection port 41 of the bottom improvement bag 4 to complete the communication between adjacent bottom improvement bags 4.

[0050] S3. Fill the construction waste mixed layer 5 into the bottom improvement bag 4, stop when the construction waste mixed layer 5 fills to the opening of the bottom improvement bag 4, and backfill the gap between the outer periphery of the bottom improvement bag 4 and the improvement trench with saline-alkali soil so that the outer periphery of the bottom improvement bag 4 contacts the saline-alkali soil.

[0051] S4. Insert the smaller-diameter end of the bottom of the improved sleeve 6 into the construction waste mixed layer 5 to complete the installation of the improved sleeve 6. Then, use saline-alkali soil to backfill the gap between the outer periphery of the improved sleeve 6 and the improved foundation trench, so that the outer periphery of the improved sleeve 6 is in contact with the saline-alkali soil. Next, fill the improved sleeve 6 with a sand-mixed layer 7;

[0052] S5. After leveling the top surface of the sand-mixed layer 7, fill the straw mixed layer 8. After the filling of the straw mixed layer 8 is completed, perform irrigation treatment in the area of the straw mixed layer 8, with 10 - 12 kg of irrigation water irrigated per square meter of the straw mixed layer 8. After the irrigation is completed, perform film mulching for moisture conservation on the surface of the straw mixed layer 8, and then plant the improved crop 9;

[0053] The improved crop 9 is a saline-alkali tolerant crop. During the planting process of the improved crop, the crop roots 91 can gradually extend through the straw mixed layer 8 into the sand-mixed layer 7 and the construction waste mixed layer 5, and the natural crops use the crop roots 91 to perform the improvement operation on the saline-alkali soil. During the use process, with the natural degradation of the bottom improvement bag 4, the improved sleeve 6 and the connecting pipeline 3, the improvement unit 1 can be degraded as a whole to reduce the occupation of the internal space of the saline-alkali land 2, and the sand-mixed layer 7 and the construction waste mixed layer 5 can also naturally disperse in the inner layer of the saline-alkali land 2, and cooperate with the crop roots 91 to complete the improvement operation of the entire area of the saline-alkali land, which is environmentally friendly and practical.

[0054] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0055] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field, characterized by: It comprises a plurality of improvement units (1) arranged in a saline-alkali land (2), wherein the plurality of improvement units (1) are connected to each other via a connecting pipe (3); The improvement unit (1) is composed of a bottom improvement bag (4) and an improvement sleeve (6); the bottom improvement bag (4) is a square bag body, and a mixed layer of construction waste (5) is also filled in the bottom improvement bag (4); The top surface of the bottom improvement bag (4) is provided with an opening, and a improvement sleeve (6) is sleeved in the opening, and a sand-mixed layer (7) is filled in the improvement sleeve (6); The sand-mixed layer (7) is also covered with a straw mixed layer (8), and the straw mixed layer (8) is flush with the surface layer of the saline-alkali land (2).

2. The comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field according to claim 1 is characterized in that: The bottom improvement bag (4) is made of a degradable starch-based material that has been waterproofed. Connecting ports (41) are arranged in four directions on the outer circumference of the bottom improvement bag (4). The ports of the connecting pipe (3) are connected to two adjacent connecting ports (41). The bottom surface of the bottom improvement bag (4) is arranged on the same horizontal plane. The water that has penetrated into the bottom of the bottom improvement bag (4) can be circulated through the connecting pipe (3), thereby improving the utilization efficiency of water resources.

3. The comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field according to claim 1 is characterized in that: The connecting pipe (3) is specifically a pipe made of polylactic acid, and the inner diameter of the connecting pipe (3) is set between 3-5 cm.

4. The comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field according to claim 1 is characterized in that: The construction waste mixed layer (5) is specifically made by mixing construction waste and saline-alkali soil in the saline-alkali land (2), and the mixing ratio of the construction waste to the saline-alkali soil is 1:3-5.

5. The comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field according to claim 4 is characterized in that: The construction waste is made by mixing crushed bricks and concrete blocks in equal proportions, and the particle size of the construction waste is no more than 3 cm.

6. The comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field according to claim 1 is characterized in that: The improved sleeve (6) is specifically a trumpet-shaped sleeve made of polylactic acid, the bottom end of the improved sleeve (6) with a smaller aperture extends 8-10 cm into the mixed layer (5) of construction waste, and the filling height of the sand-mixed layer (7) in the improved sleeve (6) is 5-8 cm smaller than the maximum filling height of the improved sleeve (6).

7. The comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field according to claim 1 is characterized in that: The sand-mixed layer (7) is made by mixing sand and saline-alkali soil, and the mixing ratio of the sand and saline-alkali soil is 1:3-5.

8. The comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field according to claim 1 is characterized in that: The straw mixed layer (8) is made of a mixture of crushed straw and saline-alkali soil, the maximum length of the crushed straw does not exceed 5 cm, the depth of the straw mixed layer (8) is set at 15-20 cm, and the depths of the construction waste mixed layer (5) and the sand mixed layer (7) are not less than the depth of the straw mixed layer (8).

9. The comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field according to claim 1 is characterized in that: The maximum cross-sectional area of ​​the sand-mixed layer (7) is not less than the cross-sectional area of ​​the construction waste mixed layer (5), and the cross-sectional area of ​​the straw mixed layer (8) is greater than the maximum cross-sectional area of ​​the sand-mixed layer (7).

10. The method for using the comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field according to claim 1, characterized in that: The following steps are involved: S1. excavating a plurality of improved foundation trenches at intervals of 80-120 cm in the saline-alkali land (2), excavating the bottom surfaces of the plurality of improved foundation trenches to the same horizontal plane, and laying connecting pipes (3) at the bottoms of adjacent improved foundation trenches, wherein the depth of the improved foundation trenches is greater than the depth of the improved unit (1); S2, placing the bottom improvement bag (4) of the salt improvement unit (1) on the bottom surface of the improvement base tank, and connecting the port of the connecting pipeline (3) to the connecting port (41) of the bottom improvement bag (4), so as to complete the communication between adjacent bottom improvement bags (4); S3, filling the construction waste mixed layer (5) into the bottom improvement bag (4), stopping when the construction waste mixed layer (5) is filled to the opening of the bottom improvement bag (4), and backfilling the gap between the outer periphery of the bottom improvement bag (4) and the improved foundation trench with saline-alkali soil, so that the outer periphery of the bottom improvement bag (4) is in contact with the saline-alkali soil; S4, inserting the end with the smaller bottom hole diameter of the improved sleeve (6) into the construction waste mixed layer (5) to complete the installation of the improved sleeve (6), and then using saline-alkali soil to return the gap between the outer periphery of the improved sleeve (6) and the improved foundation trench, so that the outer periphery of the improved sleeve (6) is in contact with the saline-alkali soil, and then filling the improved sleeve (6) with a sand-mixed layer (7); S5, after the top surface of the sand-mixed layer (7) is leveled, the straw mixed layer (8) is filled. After the straw mixed layer (8) is filled, irrigation is carried out in the straw mixed layer (8), with 10-12 kg of irrigation water per square meter of the straw mixed layer (8). After the irrigation is completed, the surface of the straw mixed layer (8) is treated with peritoneal moisture conservation, and then the improved crops (9) are planted, thereby completing the saline-alkali land improvement operation.

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