A system for multi-source collaborative improvement of alluvial fan sandy soil

Abstract

This invention belongs to the field of environmental remediation technology, specifically disclosing a system for multi-source synergistic improvement of desertified soil in alluvial fans. The system involves a compound soil pool constructed on flat ground at the top of a slope. Multiple planting rows are arranged from top to bottom on the slope surface, with each planting row comprising at least two planting groups. Each planting group includes at least one planting position with a planting hole containing crops. The planting position is also equipped with an arc-shaped baffle surrounding the planting hole on the side closest to the top of the slope. A water storage pool is located on flat ground at the bottom of the slope. Excess rainwater is drained into the storage pool through a water inlet component at the bottom of the planting hole and stored therein. The storage pool then uses a water supply component to irrigate the crops in the planting hole. This system can repurpose accumulated and collapsed sand for planting, and the arrangement of the planting positions combined with the baffles effectively intercepts rainwater and sediment, thereby reducing soil erosion. Furthermore, this system can also collect and utilize rainwater for irrigation.

Description

Technical Field

[0001] This invention relates to the field of environmental remediation technology, specifically to a system for multi-source synergistic improvement of desertified soil in alluvial fans. Background Technology

[0002] The mud and sand from the landslide are carried downstream to farmland, forming a new layer of sand or clay that buries terraced fields and green spaces, washes away newly planted vegetation, and silts up the topsoil. The erosion of the landslide leads to soil desertification in alluvial fan farmland, resulting in decreased soil fertility and poorer quality. This causes high-yield fields to become low-yield fields, leading to reduced crop yields and loss of farmland arability.

[0003] Given the destructive nature of gully erosion, Chinese scholars have conducted research on gully erosion control measures since the mid-20th century. Gully erosion control technologies can be categorized into engineering and vegetation control techniques. Engineering measures include intercepting ditches (protecting gully heads), dams (protecting gully channels), and sediment-trapping dams (protecting alluvial fans), effectively intercepting runoff and sediment inflow. Vegetation measures, such as protective forestry and grassland projects and hedgerow projects, establish vegetation to reduce the likelihood of gully erosion. While these measures have played a protective and control role against gully erosion to some extent, they still have many shortcomings: some control measures involve large-scale engineering projects and are costly; others have low green coverage and poor erosion reduction and sediment interception effects, failing to achieve the expected goals in slope protection and control of gully erosion. More importantly, rainfall causes a large amount of soil loss from the slope. Traditional measures cannot effectively collect and utilize rainwater. Watering vegetation during dry weather wastes a lot of water resources, and manual irrigation is labor-intensive. At the same time, it cannot retain the loss of sediment and cannot collect and utilize sediment again, resulting in thinning of the soil layer on the collapsed slope and increasingly infertile soil. Summary of the Invention

[0004] The purpose of this invention is to provide a system for the multi-source synergistic improvement of sandy soil in alluvial fans, addressing the aforementioned problems. This system can repurpose accumulated and collapsed sand for crop cultivation, and the arrangement of planting sites combined with baffles can effectively intercept rainwater and sediment, thereby reducing soil erosion. Furthermore, this system can also achieve effective rainwater collection and sprinkler irrigation.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A system for multi-source synergistic improvement of desertified soil in alluvial fans includes a compound soil pool constructed on flat ground at the top of a slope. The compound soil pool comprises a sand pool, a sludge pool, and a mixing pool. The mixing pool is equipped with a mixing device and a sludge storage tank. The mixing device is used to mix sand and sludge in a specific ratio, stir evenly, and discharge the mixture into the sludge storage tank for storage and air-drying of the compound soil. Multiple rows of planting rows are arranged at equal intervals from top to bottom on the slope surface. Each planting row includes at least two sets of spaced planting groups, and the planting groups in adjacent rows are staggered. Each planting group includes at least one planting position. Each planting site has a planting hole with a filter at the bottom. Improved soil, including the composite soil layer, is laid on top of the filter. The crop in the planting hole is planted in the improved soil. Each planting site also has an arc-shaped baffle surrounding the planting hole on the side near the top of the slope, with the opening of the baffle facing the bottom of the slope. A water storage tank is located on the flat ground at the bottom of the slope. Excess rainwater from the bottom of the planting hole is drained into the water storage tank through a water inlet component. The water storage tank is used to irrigate the crop in the planting hole through a water supply component.

[0007] Furthermore, the filter element comprises, from top to bottom, a layer of fine sand and gravel, a layer of geotextile, and a layer of metal mesh.

[0008] Furthermore, the improved soil also includes an acid-base regulating layer and a fertilizer-retaining layer, wherein the acid-base regulating layer is laid on the compound soil layer and the fertilizer-retaining layer is laid on the acid-base regulating layer.

[0009] Furthermore, the water inlet assembly includes water inlet branch pipes, water inlet manifold pipes, and water inlet main pipes, all embedded within the slope body; and each planting hole has a corresponding water inlet branch pipe at its bottom, each planting row has a corresponding water inlet manifold pipe, and the water inlet manifold pipes are arranged along the length of the planting row; the water inlet main pipe is located on the left side of the slope body and is arranged along the length of the slope body; the upper end of the water inlet branch pipe corresponds to the lower end of the filter element, the lower end of the water inlet branch pipe is connected to the pipe body of the water inlet manifold pipe, the right end of the water inlet manifold pipe is closed, and the left end is connected to the pipe body of the water inlet main pipe; the upper end of the water inlet main pipe is closed, and the lower end is connected to the water storage tank.

[0010] Furthermore, the water supply assembly includes water supply branch pipes, water supply manifolds, a main water supply pipe, and a water pump, all buried within the slope. Each planting hole has a corresponding water supply branch pipe on its lower side, and each planting row has a corresponding water supply manifold, which is arranged along the length of the planting row. The main water supply pipe is located on the right side of the slope and is arranged along its length. The upper end of each water supply branch pipe protrudes from the slope surface and connects to a spray pipe. The free end of the spray pipe is connected to a nozzle, which is used to irrigate the roots of the crop. The lower end of each water supply branch pipe is connected to the body of the water supply manifold. The left end of the water supply manifold is closed, and the right end of the water supply manifold is connected to the body of the main water supply pipe. The upper end of the main water supply pipe is closed, and the lower end of the main water supply pipe is connected to the water storage tank via the water pump.

[0011] Furthermore, the water storage tank adds water to the stirring device via a water adding component.

[0012] Furthermore, a large stone interception dam is set above the compound soil pool.

[0013] Furthermore, an overflow outlet is provided on the left and / or right side of the sand pit, and the overflow outlet is connected to an overflow channel, the end port of which is located at the bottom of the slope.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0015] (1) By building a composite soil pond above the slope, the sand pond of the composite soil pond can effectively collect the mud and sand accumulated by the land loss above, while the sludge pond can store the sludge obtained after centrifugal dewatering of the urban sewage treatment plant. The sludge and sand are fully mixed in proportion by the mixing device, which can effectively utilize the nutrients and organic matter in the sludge as fertilizer and soil conditioner, improve the soil texture, optimize the water and fertilizer retention of sandy soil, and improve the fertility of the collapsed sandy soil, so as to increase crop yield.

[0016] (2) Planting pits are made on the slope. By planting crops in the planting pits, vegetation can be established and the soil can be stabilized. The baffles set around the planting pits can effectively reduce soil erosion and improve water and fertilizer retention capacity.

[0017] (3) The improved soil formed by laying the compound soil layer, acid-base adjustment layer and fertilizer retention layer from bottom to top can make the soil form a "sandwich" structure. This kind of mixture can achieve the effects of water retention, acidification prevention and fertilizer retention, adjust the properties of alluvial fan soil, improve soil fertility, and provide a good soil environment for crop growth, so as to achieve the best effect of improving alluvial fan soil.

[0018] (4) By installing a filter at the bottom of the planting hole, rainwater can be effectively filtered. Combined with the water inlet component, water that has seeped into the soil can be effectively collected into the water storage tank, reducing rainwater loss and improving water resource utilization. At the same time, the water supply component can automatically and accurately spray water from the water storage tank onto the crops in each planting hole through the nozzles, thereby improving crop survival rate and yield, and effectively preventing soil erosion. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 yes Figure 1 A cross-sectional view corresponding to the planting hole.

[0021] Explanation of main component symbols

[0022] In the diagram, 100-first flat area, 200-second flat area, 300-slope, 1-composite soil pool, 2-planting hole, 21-composite soil layer, 22-acid-base regulating layer, 23-fertilizer retention layer, 3-baffle, 4-water storage pool, 5-overflow trough, 6-large rock interception dam, 7-filter element, 71-fine sand and gravel layer, 72-geotextile layer, 73-metal mesh layer, 8-inlet branch pipe, 9-water supply branch pipe, 10-sprinkler pipe, 11-sprinkler head.

[0023] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixed," and "located in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] Furthermore, in this application, unless otherwise expressly specified and limited, the term "above" or "below" a second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0028] like Figure 1-2 As shown in one embodiment of the present invention, a system for multi-source synergistic improvement of alluvial fan desertified soil includes a first flat area 100 and a second flat area 200 on the desertified soil, with a slope 300 between the first flat area 100 and the second flat area 200 for planting crops. A compound soil pool 1 is constructed on the first flat area 100 at the top of the slope 300. The compound soil pool 1 includes a sand pool, a sludge pool, and a mixing pool (not shown in the figure). The sand pool is used to directly collect sand flowing down from above. The sludge pool is used to store sludge obtained from centrifugal dewatering at a municipal sewage treatment plant. The mixing pool is equipped with a mixing device and a sludge storage tank. The mixing device is used to mix the sand and sludge in a specific ratio, stir them evenly, and discharge them into the sludge storage tank to store the air-dried compound soil. The resulting compound soil has good water and fertilizer retention properties, optimizes the water and fertilizer retention of sandy soil, improves soil texture, and enhances the fertility of the desertified soil. Applying it to crop cultivation can increase crop yield. The specific layout and corresponding stirring devices described above are all existing technologies and will not be elaborated upon here.

[0029] For example, the compound soil tank 1 is constructed by pouring concrete and has an opening at the top. The sand tank, the sludge tank and the mixing tank are separated by a partition wall. The sand tank is located on the side of the first flat land away from the slope, so as to directly receive the sand that flows down from above.

[0030] Exemplarily, when stirring, the sediment and sludge in the sand pool and the sludge pool can be poured into the stirring device through the mud inlet hopper, and the compounding ratio of the two can be flexibly adjusted according to actual needs.

[0031] On the slope surface of the slope body 300, multiple rows of planting rows are provided at equal intervals from top to bottom. Each planting row includes at least two groups of spaced planting groups, and the planting groups of adjacent two rows of the planting rows are arranged in a staggered manner, that is, in a "pin" shape. The planting group includes a planting position, and each planting position is provided with a planting hole 2. A filter element 7 is provided at the bottom of the planting hole 2, and improved soil is laid on the filter element 7. The improved soil includes the compound soil layer 21, and the crops in the planting hole 2 are planted in the improved soil. The design that the planting holes 2 in the upper and lower two rows are arranged in a staggered and "pin" shape can effectively intercept the slope surface runoff and promote vegetation restoration.

[0032] Exemplarily, the pit distance of the planting holes 2 in the same row is 1.5 m - 3.5 m, the pit distance of the planting holes 2 in the upper and lower two rows is 1.5 m - 2 m, and the radius of the planting hole 2 is 0.4 m - 0.6 m. Under this specification, the best runoff interception and prevention of soil loss effects can be achieved.

[0033] In this embodiment, preferably, the improved soil further includes an acid-base adjustment layer 22 and a fertilizer retention layer 23. The acid-base adjustment layer 22 is laid on the compound soil layer 21, and the fertilizer retention layer 23 is laid on the acid-base adjustment layer 22. When laying, first evenly distribute the compound soil in the planting hole 2, and perform treatments such as leveling and compaction, and the thickness should not be less than 10 cm; then lay materials that can neutralize acidic substances and adjust the soil acidity as the acid-base adjustment layer 22, and perform treatments such as leveling and compaction, and the thickness is not less than 5 cm; finally, lay organic fertilizers and mineral fertilizers on the acid-base adjustment layer 22 as the fertilizer retention layer 23, and perform treatments such as leveling and compaction, and the thickness is not less than 5 cm. By setting three layers of modifiers, the soil forms a "sandwich cookie" structure. This kind of mixed combination can achieve the effects of water retention, preventing acidification and fertilizer retention, adjust the properties of the diluvial fan soil, improve soil fertility, and provide a good soil environment for crop growth to achieve the best effect of improving the diluvial fan soil.

[0034] Exemplarily, the materials used for the acid-base adjustment layer 22 are perlite, desulfurized gypsum and / or lignin, etc.; the materials used for the fertilizer retention layer 23 are humus and / or urea, etc.

[0035] For example, the filter element 7 includes a fine sand and gravel layer 71, a geotextile layer 72, and a metal mesh layer 73 laid sequentially from top to bottom. The filter element 7, composed of these three layers, effectively removes impurities from the infiltrated water and prevents soil erosion in the planting hole 2.

[0036] The planting site is also equipped with an arc-shaped baffle 3, which surrounds the planting hole 2 on the side near the top of the slope 300, with the opening of the baffle 3 facing the bottom of the slope 300. By setting the baffle 3, soil erosion can be effectively reduced, crops can be prevented from being washed away, and water and fertilizer retention capacity can be improved.

[0037] For example, the baffle 3 is made of concrete.

[0038] A water storage tank 4 is provided on the second flat ground 200 at the bottom of the slope 300. Excess rainwater is discharged into the water storage tank 4 through the water inlet component at the bottom of the planting hole 2. The water storage tank 4 sprays water onto the crops in the planting hole 2 through the water supply component, thereby effectively collecting and utilizing rainwater, and automatically and appropriately irrigating the vegetation in dry weather.

[0039] For example, the water inlet assembly includes water inlet branch pipes 8, water inlet manifold pipes (not shown in the figure), and water inlet main pipes (not shown in the figure), all buried in the slope body; and each planting hole 2 is provided with a corresponding water inlet branch pipe 8 at its bottom, each planting row is provided with a corresponding water inlet manifold pipe, and the water inlet manifold pipes are arranged along the length direction of the planting row; the water inlet main pipe is located on the left side of the slope body and is arranged along the length direction of the slope body 300; the upper end of the water inlet branch pipe 8 corresponds to the lower end of the filter element 7, the lower end of the water inlet branch pipe 8 is connected to the pipe body of the water inlet manifold pipe, the right end of the water inlet manifold pipe is closed and the left end is connected to the pipe body of the water inlet main pipe, the upper end of the water inlet main pipe is closed and the lower end is connected to the water storage tank 4. When collecting rainwater, the rainwater is filtered through the filter element 7 and enters the inlet branch pipe 8, then enters the inlet manifold pipe, then enters the main inlet pipe, and finally enters the water storage tank 4.

[0040] For example, the water supply assembly includes water supply branch pipes 9, water supply manifold pipes (not shown in the figure), water supply main pipes (not shown in the figure), and water pumps (not shown in the figure), all of which are buried in the slope body; and each planting hole 2 is provided with a corresponding water supply branch pipe 9 on its lower side, each planting row is provided with a corresponding water supply manifold pipe, and the water supply manifold pipes are arranged along the length direction of the planting row; the water supply main pipe is located on the right side of the slope 300 and is arranged along the length direction of the slope 300. The upper end of the water supply branch pipe 9 protrudes from the slope surface and connects to the sprinkler pipe 10. The free end of the sprinkler pipe 10 is connected to the nozzle 11, which is used for spraying irrigation to the roots of the crops. The lower end of the water supply branch pipe 9 is connected to the body of the water supply manifold. The left end of the water supply manifold is closed, and the right end of the water supply manifold is connected to the body of the main water supply pipe. The upper end of the main water supply pipe is closed, and the lower end of the main water supply pipe is connected to the water storage tank 4 via the water pump. During irrigation, the water in the water storage tank 4 is pumped through the main water supply pipe, the water supply manifold, the water supply branch pipe, and the sprinkler pipe, and then sprayed out from the nozzle to spray the roots of the crops.

[0041] In a preferred embodiment of the present invention, the water storage tank 4 can add water to the stirring device via a water supply assembly. The water supply assembly includes a water supply pipe, which is embedded within the slope 300 and arranged along the length of the slope 300. One end of the water supply pipe is located above the stirring device, and the other end is connected to the water storage tank via a water pump. When water needs to be added for stirring, the water pump can be activated to add water to the stirring device through the water supply pipe, making it convenient to use.

[0042] In a more preferred embodiment of the present invention, a large stone interception dam 6 is provided above the compound soil pool 1. The large stone interception dam 6 can effectively intercept large-diameter stones and only allow small-diameter mud and sand to pass through, thereby effectively preventing large stones from entering the sand and soil pool, which is beneficial to the subsequent mixing.

[0043] In a preferred embodiment of the present invention, an overflow outlet is provided on the left and / or right side of the sand and soil pool, and the overflow outlet is connected to an overflow channel 5, the end port of which is located at the bottom of the slope 300. When there is too much water or sand in the sand and soil pool, the water or sand in the pool can flow to the bottom of the slope through the overflow channel 5, preventing the overflowing sand or water from directly eroding the crops on the slope 300.

[0044] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A system for multi-source synergistic improvement of alluvial fan desertified soil, characterized in that, The system includes a compound soil pool located on flat ground at the top of the slope. The compound soil pool comprises a sand pool, a sludge pool, and a mixing pool. The mixing pool is equipped with a mixing device and a sludge storage tank. The mixing device is used to mix sand and sludge in a specific ratio, ensuring uniform mixing before discharging the mixture into the sludge storage tank for storage and drying. Multiple planting rows are spaced evenly from top to bottom on the slope surface. Each planting row includes at least two sets of spaced planting groups, with the planting groups in adjacent rows staggered. Each planting group includes at least one planting position, and each planting position has a planting hole. The bottom of each planting hole is equipped with a filter element, which includes a layer of fine sand and gravel laid sequentially from top to bottom, along with a geotextile layer. The filter element consists of a cloth layer and a metal mesh layer. Improved soil is laid on top of the filter element. The improved soil includes a compound soil layer, a pH adjusting layer, and a fertilizer retaining layer. The pH adjusting layer and the fertilizer retaining layer are laid on top of the pH adjusting layer. Crops in the planting holes are planted in the improved soil. The planting position is also equipped with an arc-shaped baffle. The baffle surrounds the planting hole on the side near the top of the slope, with its opening facing the bottom of the slope. A water storage tank is located on the flat ground at the bottom of the slope. Excess rainwater from the bottom of the planting hole is drained into the water storage tank through a water inlet assembly. The water storage tank provides sprinkler irrigation to the crops in the planting holes through a water supply assembly. The water storage tank is filled with water to the stirring device through a water filling component; a large stone interception dam is set above the compound soil tank; an overflow outlet is opened on the left and / or right side of the sand tank, the overflow outlet is connected to an overflow channel, and the end port of the overflow channel is located at the bottom of the slope.

2. The system for multi-source synergistic improvement of alluvial fan desertified soil according to claim 1, characterized in that, The water inlet assembly includes water inlet branch pipes, water inlet manifold pipes, and water inlet main pipes, all embedded in the slope. Each planting hole has a corresponding water inlet branch pipe at its bottom, and each planting row has a corresponding water inlet manifold pipe, with the water inlet manifold pipes arranged along the length of the planting row. The water inlet main pipe is located on the left side of the slope and is arranged along the length of the slope. The upper end of each water inlet branch pipe corresponds to the lower end of the filter element, and the lower end of each water inlet branch pipe is connected to the body of the water inlet manifold pipe. The right end of the water inlet manifold pipe is closed, and the left end is connected to the body of the water inlet main pipe. The upper end of the water inlet main pipe is closed, and the lower end is connected to the water storage tank.

3. The system for multi-source synergistic improvement of alluvial fan desertified soil according to claim 1, characterized in that, The water supply system includes water supply branch pipes, water supply manifolds, a main water supply pipe, and a water pump, all embedded within the slope. Each planting hole has a corresponding water supply branch pipe on its lower side, and each planting row has a corresponding water supply manifold, which extends along the length of the planting row. The main water supply pipe is located on the right side of the slope and extends along its length. The upper end of each water supply branch pipe protrudes from the slope surface and connects to a sprinkler pipe. The free end of the sprinkler pipe connects to a nozzle used for irrigating the roots of the crop. The lower end of each water supply branch pipe connects to the body of the water supply manifold. The left end of the water supply manifold is closed, and the right end of the water supply manifold connects to the body of the main water supply pipe. The upper end of the main water supply pipe is closed, and the lower end of the main water supply pipe connects to the water storage tank via the water pump.

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