Saline-alkali soil in-situ improvement equipment and saline-alkali soil improvement method
By installing photovoltaic panels on saline-alkali land to collect rainwater and using electroosmosis devices for desalination, the problem of freshwater consumption in saline-alkali land improvement in arid areas has been solved, achieving low-cost and high-efficiency saline-alkali land improvement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-06
- Publication Date
- 2026-04-10
AI Technical Summary
Existing saline-alkali land improvement technologies consume large amounts of freshwater resources in arid regions, are costly, and are difficult to implement.
Photovoltaic panels are used to collect rainwater and desalinate it through an electroosmosis device. Combined with drip irrigation and drainage systems, the rainwater resources of the saline-alkali land itself are used for desalination, reducing dependence on freshwater.
It effectively reduces the cost and difficulty of saline-alkali land improvement in arid regions, and achieves efficient desalination by utilizing rainwater resources locally.
Smart Images
Figure CN121816893A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of saline-alkali land improvement technology, and in particular to an in-situ saline-alkali land improvement device and a saline-alkali land improvement method. Background Technology
[0002] Saline-alkali land refers to soil where the salt content affects the normal growth of plants. Statistics show that my country has 90 million hectares of saline-alkali land, mainly distributed in coastal areas and the northwest. With the continuous development of the national economy and the ongoing environmental degradation, the effective arable land area is gradually decreasing. Saline-alkali land, as a potential land resource, will undoubtedly become an important measure for further developing agricultural production if it can be developed and utilized. In recent years, the work of improving saline-alkali land has been vigorously promoted. Among related technologies, electroosmosis is used to improve saline-alkali land. This involves constructing dikes on the saline-alkali land and injecting fresh water within the dike area. Cathodes and anodes are installed within the saline-alkali land, and the electric field between the cathodes and anodes causes the cations and anions in the salt to separate. The separated salt ions are discharged with the fresh water, thus achieving desalination of the saline-alkali land. However, for the relatively arid northwest region, this method requires a large amount of fresh water resources, making implementation difficult and costly. Summary of the Invention
[0003] The purpose of this invention is to provide an in-situ improvement device and method for saline-alkali land, which facilitates the implementation of improvement projects and has low improvement costs.
[0004] To achieve this objective, the present invention adopts the following technical solution:
[0005] Firstly, a device for in-situ improvement of saline-alkali land is provided, comprising:
[0006] A power source, comprising several photovoltaic panels arranged at an angle;
[0007] A water storage device, comprising a water tank and a water collection trough, wherein the water collection trough is located at a relatively low end of the photovoltaic panel and is used to collect rainwater from the photovoltaic panel, and the water collection trough is connected to the water tank;
[0008] A drip irrigation device, comprising a plurality of porous water pipes, all of which are spaced apart in the saline-alkali land area to be desalinated, the porous water pipes being connected to a water tank, and rainwater in the water tank being sprayed onto the saline-alkali land area to be desalinated through the porous water pipes;
[0009] An electroosmosis device, comprising a cathode and an anode, wherein the cathode is configured as a porous tubular structure and is horizontally buried in the saline-alkali land area to be desalinated, and one end of the anode is inserted into the saline-alkali land area to be desalinated, and both the anode and the cathode are electrically connected to a power source;
[0010] A drainage device, comprising a water collection well and a water pump connected to the water collection well, wherein the cathode is connected to the water collection well.
[0011] In one embodiment, the cathode includes a conductive tube with a plurality of water inlet holes. The periphery of the conductive tube is wrapped with a filter screen layer, and rainwater in the saline-alkali land desalination area can pass through the filter screen layer and the water inlet holes in sequence and enter the conductive tube.
[0012] In one embodiment, the water tank has a containment cavity for storing rainwater, and a filter assembly is provided on top of the containment cavity for filtering impurities from the rainwater.
[0013] In one embodiment, the filter assembly includes a filter housing and a sand and gravel layer filled in the filter housing. The filter housing is inserted into the water tank and detachably connected to the water tank. The bottom of the filter housing is provided with a plurality of drainage holes communicating with the receiving cavity.
[0014] In one embodiment, the porous water pipe is disposed on the surface of the saline-alkali land to be desalinated area, and a plurality of spray hole groups are spaced apart along its axial direction on the porous water pipe. Each spray hole group includes a plurality of spray holes spaced apart along the circumferential direction of the porous water pipe, and the spray holes are concentrated in the lower half of the porous water pipe.
[0015] In one embodiment, a plastic film is also included, which is laid on the surface of the saline-alkali land area to be desalinated, and the porous water pipe is located below the plastic film.
[0016] In one embodiment, one end of the porous water pipe is vertically inserted into the interior of the saline-alkali land to be desalinated area, and the periphery of the porous water pipe is provided with multiple spray holes.
[0017] In one embodiment, the porous water pipe is inserted into the saline-alkali land desalination area to a depth of more than 0.5m, and the cathode is located below the porous water pipe.
[0018] In one embodiment, the system further includes a dosing tank and a mixing tank. The mixing tank is located between the drip irrigation device and the water tank. The mixing tank is equipped with a stirrer for stirring rainwater. The dosing tank is used to store the amendment. The dosing tank is connected to the mixing tank to input the amendment into the mixing tank.
[0019] Secondly, a method for improving saline-alkali land is also provided, which utilizes in-situ saline-alkali land improvement equipment to desalinate the saline-alkali land, specifically including the following steps:
[0020] Step S1: Monitor the humidity and rainfall of the saline-alkali land to be desalinated area. When the humidity value of the saline-alkali land to be desalinated area exceeds the set value, turn on the electroosmosis device and the drainage device.
[0021] Step S2: When the rainfall is lower than the set value, turn on the drip irrigation device, and the rainwater collected in the water storage device is sprayed into the saline-alkali land area to be desalinated through the drip irrigation device.
[0022] Step S3: After the rainwater in the water storage device is depleted, turn off the electroosmosis device and the drainage device, and test the salt content of the saline-alkali land to be desalinated area.
[0023] The advantages of this invention compared to the prior art are:
[0024] This invention discloses an in-situ saline-alkali land improvement device and method. It utilizes photovoltaic panels to provide power to an electroosmosis device, while simultaneously collecting rainwater and storing it in a water storage unit. During desalination, rainwater accessible to the desalinated area and collected in the storage unit are directly used as freshwater resources for desalination, enabling on-site resource utilization. This is particularly beneficial for arid regions with relatively scarce water resources, reducing the difficulty and cost of saline-alkali land improvement projects. Attached Figure Description
[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0026] Figure 1 This is a schematic diagram of an in-situ saline-alkali land improvement device according to an embodiment of the present invention.
[0027] Figure 2 This is a schematic diagram of the cathode according to an embodiment of the present invention.
[0028] Figure 3 This is a schematic diagram of a water tank according to an embodiment of the present invention.
[0029] Figure 4 This is a schematic diagram of a drip irrigation device according to another embodiment of the present invention.
[0030] In the picture:
[0031] 1. Power supply; 11. Photovoltaic panel; 12. Support frame; 2. Water storage device; 21. Water tank; 210. Receiving cavity; 211. Water storage tank body; 212. Filter box body; 213. Sand and gravel layer; 22. Water collection trough; 3. Drip irrigation device; 31. Porous water pipe; 4. Electroosmosis device; 41. Anode; 42. Cathode; 421. Conductive pipe body; 422. Filter screen layer; 423. Water inlet; 5. Drainage device; 51. Water collection well; 52. Water pump; 6. Mixing tank; 7. Dosing tank; 100. Saline-alkali land area to be desalinated. Detailed Implementation
[0032] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0033] like Figure 1As shown, this invention provides an in-situ saline-alkali land improvement device for desalinating a saline-alkali land area 100 to be desalinated. The device includes a power source 1, a water storage device 2, a drip irrigation device 3, an electroosmosis device 4, and a drainage device 5. The power source 1 provides electrical energy to the entire device. It includes several tilted photovoltaic panels 11 that convert solar energy into electrical energy. The water storage device 2 stores rainwater to provide freshwater for the desalination process. It includes a water tank 21 and a collection trough 22. The collection trough 22 is located at the lower end of the photovoltaic panels 11 and collects rainwater flowing from them. It is connected to the water tank 21 via a pipe, and the rainwater collected in the trough flows into the tank 21 for storage. The drip irrigation device 3 sprays rainwater onto the saline-alkali land area 100 to dissolve the salt in the rainwater. The drip irrigation device 3 includes several porous water pipes 31, all of which are spaced apart within the saline-alkali land desalination area 100. The porous water pipes 31 are connected to a water tank 21 via pipes, and rainwater from the water tank 21 is sprayed into the saline-alkali land desalination area 100 through the porous water pipes 31. The electroosmosis device 4 is used for electrodialysis treatment of the salt. The electroosmosis device 4 includes an anode 41 and a cathode 42. One end of the anode 41 is inserted into the saline-alkali land desalination area 100, and the cathode 42 is horizontally buried within the saline-alkali land desalination area 100. Both the anode 41 and the cathode 42 are electrically connected to a power source 1. When the anode 41 and cathode 42 are energized, a pathway is formed between them through rainwater, creating an electric field throughout the saline-alkali land desalination area 100. This causes cations in the salt to accumulate towards the cathode 42, and anions in the salt to accumulate towards the anode 41. The cathode 42 is configured as a porous tubular structure, allowing rainwater from the saline-alkali land desalination area 100 to flow into it. A drainage device 5 is used to drain the rainwater from the saline-alkali land desalination area 100. The drainage device 5 includes a collection well 51 and a pump 52. The collection well 51 is vertically installed within the saline-alkali land desalination area 100, and the cathode 42 is connected to it. Rainwater collected in the cathode 42 flows into the collection well 51. The pump 52 is connected to the collection well 51 via a pipe and is used to pump the rainwater from the collection well 51 to the outside for further separation of salt molecules in the rainwater.
[0034] Understandably, by installing photovoltaic panels 11 to provide electricity to the electroosmosis device 4, and simultaneously using the photovoltaic panels 11 to collect rainwater and concentrate it in the water storage device 2, the desalination process can directly utilize the rainwater available to the saline-alkali land area 100 for desalination, as well as the rainwater collected in the water storage device 2, as freshwater resources for desalination treatment, thus achieving on-site resource utilization. This is particularly beneficial for arid regions with relatively scarce water resources, reducing the difficulty and cost of implementing saline-alkali land improvement projects.
[0035] Specifically, refer to Figure 2 As shown, the cathode 42 includes a conductive tube 421 and a filter layer 422. The conductive tube 421 is a metal tube to provide conductivity. Several water inlet holes 423 are provided on the conductive tube 421. The conductive tube 421 is buried inside the saline-alkali land desalination area 100. Under the action of the water pump 52, a negative pressure is created inside the conductive tube 421, allowing rainwater from the saline-alkali soil to enter the conductive tube 421 through the water inlet holes 423 and eventually flow into the collection well 51. The filter layer 422 wraps around the periphery of the conductive tube 421, is used to isolate the conductive tube 421 from the soil to prevent fine soil particles from clogging the water inlet holes 423. Rainwater from the saline-alkali land desalination area can pass through the filter layer 422 and the water inlet holes 423 sequentially and enter the conductive tube 421. The anode 41 is made of graphite to improve its corrosion resistance. Anode 41 and cathode 42 are electrically connected to power source 1 via wires. When arranging cathodes 42 and anodes 41, multiple cathodes 42 are distributed sequentially at intervals along a first direction, and all cathodes 42 are buried at the same depth. Anode 41 is positioned between two adjacent cathodes 42 to create multiple electric fields within the desalination area 100 of the saline-alkali land. When energized, cations in the rainwater (e.g., Ca2+, Na+, etc.) move towards cathodes 42, while anions in the rainwater (e.g., SO42-, Cl-, etc.) move towards anodes 41.
[0036] Specifically, refer to Figure 1 and Figure 3 As shown, several photovoltaic panels 11 are arranged in an array, with gaps between adjacent photovoltaic panels 11 to allow rainwater to fall through the gaps. The photovoltaic panels 11 are tilted to direct rainwater to the lower end. The position of the water collection trough 22 is adapted to the position where rainwater falls from the photovoltaic panels 11 to collect the rainwater falling from the photovoltaic panels 11. The water tank 21 includes a water storage tank body 211 and a filter assembly. A receiving cavity 210 for storing rainwater is formed inside the water storage tank body 211. The filter assembly is disposed at the top of the receiving cavity 210 and filters the rainwater entering the water tank 21. The filter assembly includes a filter box body 212 and a sand and gravel layer 213 filled inside the filter box body 212. The top of the filter box body 212 has an opening, and the top of the water storage tank body 211 also has an opening. The filter box body 212 is detachably installed at the opening end of the water storage tank body 211. The sand and gravel layer 213 is composed of a mixture of crushed stone and absorbent sand, and is laid flat inside the filter housing 212. Multiple drainage holes are provided at the bottom of the filter housing 212, which connects to the receiving cavity 210. Rainwater is collected by the water collection tank 22 and then piped into the filter housing 212. After being filtered by the sand and gravel layer 213, the rainwater enters the receiving cavity 210 through the drainage holes for storage.
[0037] Specifically, refer to Figure 1 As shown, a porous water delivery pipe 31 is disposed on the surface of the saline-alkali land desalination area 100. Multiple spray hole groups are arranged along the upper edge of the porous water delivery pipe 31 at intervals along its axial direction. Each spray hole group includes multiple spray holes, which are spaced apart along the circumference of the porous water delivery pipe 31. The porous water delivery pipe 31 is used to spray rainwater into the saline-alkali soil; therefore, the spray holes are concentrated in the lower half of the porous water delivery pipe 31. The spacing between two adjacent porous water delivery pipes 31 can be adapted to the spray range of each porous water delivery pipe 31 so that the rainwater sprayed by the drip irrigation device 3 can cover the entire saline-alkali land desalination area 100. Correspondingly, the drip irrigation device 3 also includes a water pump, which is installed on the pipe between the drip irrigation device 3 and the water tank 21 to drive the rainwater in the water tank 21 to flow into the porous water delivery pipe 31.
[0038] To prevent rapid evaporation of rainwater in the saline-alkali land desalination area 100, the in-situ saline-alkali land improvement equipment also includes a plastic film and a film-laying roller. The plastic film is laid on the surface of the saline-alkali land desalination area 100, with a porous water pipe 31 located below the plastic film. The plastic film is rolled up on the film-laying roller; during rain, the plastic film is in a retracted state, allowing rainwater to fall directly into the saline-alkali soil. After the rain stops, the plastic film is unfolded using the film-laying roller to reduce the rate of rainwater evaporation.
[0039] In another embodiment, reference is made to Figure 4 As shown, multiple porous water pipes 31 are spaced horizontally. One end of each pipe 31 is inserted into the saline-alkali land desalination area 100, while the other end is located on the surface of the area and connected to the water tank 21 via a pipe. Multiple spray holes are arranged around the periphery of each porous water pipe 31. This structure allows rainwater to be sprayed directly into the saline-alkali soil, preventing significant evaporation loss due to water being sprayed onto the soil surface. The porous water pipes 31 are inserted into the saline-alkali land desalination area 100 to a depth greater than 0.5m to meet the requirements for soil improvement layer thickness. The cathode 42 is located below the porous water pipes 31.
[0040] Specifically, refer to Figure 1As shown, the in-situ soil improvement device for saline-alkali land also includes a dosing tank 7 and a mixing tank 6. The mixing tank 6 is located between the drip irrigation device 3 and the water tank 21, and contains a stirrer. The dosing tank 7 stores an amendment, which can be humic acid. The dosing tank 7 is connected to the mixing tank 6 to allow the amendment to be introduced into the mixing tank 6. The stirrer is used to mix the rainwater and amendment in the mixing tank 6. The rainwater mixed with the amendment is then sprayed onto the saline-alkali soil through the drip irrigation device 3. By adding an amendment to the rainwater, physical and chemical methods are combined to further enhance the soil improvement effect on saline-alkali land.
[0041] Specifically, the power supply 1 also includes a support bracket 12, a battery, and a voltage regulator. The battery stores the electrical energy generated by the photovoltaic panel 11. The voltage regulator is electrically connected to the battery and is used to regulate the output voltage so that the voltage of the electroosmosis device 4 can be adjusted to 110V-360V to meet the operating requirements of the electroosmosis device 4. The support bracket 12 supports the photovoltaic panel 11.
[0042] Specifically, the in-situ improvement equipment for saline-alkali land also includes an existing control system, which comprises a PLC controller, a display monitor, a soil salinity sensor, a soil pH sensor, a soil moisture sensor, a flow meter, a rain gauge, and a water level gauge. The control system is electrically connected to a power supply 1. The soil salinity sensor is installed in the saline-alkali land area to be desalinated to detect the soil salinity. The soil pH sensor detects the soil pH value. The soil moisture sensor detects the soil moisture. The flow meter is installed on the pipeline to detect the flow rate of rainwater entering the drip irrigation device 3. The water level gauge is installed in the water tank 21 to detect the amount of rainwater stored in the tank. The rain gauge is installed on the photovoltaic panel 11 to detect the rainfall. The PLC controller analyzes and processes the data collected by the soil salinity sensor, soil pH sensor, soil moisture sensor, flow meter, rain gauge, and water level gauge, and issues control commands to the corresponding actuators. For example, when it rains, if the soil sensor detects that the humidity value exceeds the set value, indicating that the surface saline-alkali soil has been soaked by rainwater, the PLC controller can activate the electro-osmosis device 4 to begin electro-osmosis treatment. When the rain gauge detects that the rainfall is low or that the rain has stopped, the PLC controller can activate the drip irrigation device 3 to continue supplying rainwater to the saline-alkali land desalination area 100. The display monitor is used to display the detection parameters of each sensor, the operating status of the equipment, etc., so that personnel can understand the operating status of the equipment and make manual interventions.
[0043] like Figure 1 As shown, the present invention also provides a method for improving saline-alkali land, which utilizes in-situ saline-alkali land improvement equipment to desalinate the saline-alkali land. Specifically, it includes the following steps:
[0044] Step S1: Monitor the humidity and rainfall of the saline-alkali land desalination area 100. When the humidity value of the saline-alkali land desalination area 100 exceeds the set value, turn on the electroosmosis device 4 and the drainage device 5.
[0045] Specifically, the various components of the in-situ saline-alkali land improvement equipment are first installed. An area designated as the desalination zone 100 is planned on the saline-alkali land, and the cathode 42 is buried in the soil within the desalination zone 100. A soil moisture sensor monitors the moisture content of the desalination zone 100, and a rain gauge monitors the rainfall. When the rain gauge detects rain and the rainfall reaches a certain level, and as the rain continues and water seeps into the soil, the soil moisture sensor detects that the soil moisture exceeds a set value, indicating that the entire desalination zone 100 is in a conductive state. The electroosmosis device 4 and the drainage device 5 are then activated, causing the ions of the salt dissolved in the rainwater to separate. The cations in the salt enter the cathode 42 with the rainwater and are eventually discharged to the outside through the drainage device 5. The anions in the salt are adsorbed onto the anode 41 and can be removed along with the anode 41 later.
[0046] Step S2: When the rainfall is lower than the set value, turn on the drip irrigation device 3. The rainwater collected in the water storage device 2 is sprayed through the drip irrigation device 3 to the saline-alkali land desalination area 100.
[0047] Specifically, when rainfall stops or decreases, the amount of rainwater naturally falling into the soil is insufficient to meet the needs of electrodialysis treatment. Therefore, when the rainfall is below the set value, the drip irrigation device 3 is activated to continue to input the rainwater collected in the water storage device 2 into the soil, so that the desalination treatment can continue and thus improve the treatment efficiency.
[0048] Step S3: After the rainwater in the water storage device 2 is consumed, turn off the electroosmosis device 4 and the drainage device 5, and test the salt content of the saline-alkali land desalination area 100.
[0049] Specifically, the rainwater level in tank 21 is monitored using a water level gauge. Once the rainwater in tank 21 is depleted, it can no longer provide fresh water for the desalination process, so the electro-osmosis device 4, drip irrigation device 3, and drainage device 5 are shut down. Soil pH and salinity sensors are used to monitor the soil salinity. When the salinity meets the improvement requirements, the treatment ends, and the electro-osmosis device 4, drip irrigation device 3, and drainage device 5 are moved to another saline-alkali land area 100 to be desalinated. When the salinity does not meet the improvement requirements, the process continues to wait for rainfall for another round of desalination.
[0050] In this embodiment, the desalination treatment of the saline-alkali land area 100 is carried out in two stages. The first stage utilizes natural rainfall to provide fresh water, which falls directly into the saline-alkali soil. The second stage utilizes rainwater collected from photovoltaic panels 11 to provide fresh water, so that desalination treatment can continue for a certain period of time after the rain stops. This method maximizes the utilization of rainwater and is particularly suitable for areas with scarce freshwater resources. It helps reduce the cost of saline-alkali land improvement and promotes the implementation of improvement projects.
[0051] The beneficial effects of this embodiment are as follows: Photovoltaic panels 11 provide electricity to the electroosmosis device 4, while simultaneously collecting rainwater and concentrating it in the water storage device 2. During the desalination process, rainwater received by the saline-alkali land area 100 and rainwater collected in the water storage device 2 are directly used as freshwater resources for desalination, enabling on-site resource utilization. This is particularly beneficial for arid regions with relatively scarce water resources, reducing the difficulty and cost of implementing saline-alkali land improvement projects.
[0052] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.
Claims
1. A device for in-situ improvement of saline-alkali land, characterized in that, include: A power source, comprising several photovoltaic panels arranged at an angle; A water storage device, comprising a water tank and a water collection trough, wherein the water collection trough is located at a relatively low end of the photovoltaic panel and is used to collect rainwater from the photovoltaic panel, and the water collection trough is connected to the water tank; A drip irrigation device, comprising a plurality of porous water pipes, all of which are spaced apart in the saline-alkali land area to be desalinated, the porous water pipes being connected to a water tank, and rainwater in the water tank being sprayed onto the saline-alkali land area to be desalinated through the porous water pipes; An electroosmosis device, comprising a cathode and an anode, wherein the cathode is configured as a porous tubular structure and is horizontally buried in the saline-alkali land area to be desalinated, and one end of the anode is inserted into the saline-alkali land area to be desalinated, and both the anode and the cathode are electrically connected to a power source; A drainage device, comprising a water collection well and a water pump connected to the water collection well, wherein the cathode is connected to the water collection well.
2. The in-situ improvement equipment for saline-alkali land according to claim 1, characterized in that, The cathode includes a conductive tube with several water inlet holes. The periphery of the conductive tube is wrapped with a filter screen layer. Rainwater in the saline-alkali land desalination area can pass through the filter screen layer and the water inlet holes in sequence and enter the conductive tube.
3. The in-situ improvement equipment for saline-alkali land according to claim 1, characterized in that, The water tank has a cavity for storing rainwater, and a filter assembly is provided on the top of the cavity for filtering impurities from the rainwater.
4. The in-situ improvement equipment for saline-alkali land according to claim 3, characterized in that, The filter assembly includes a filter housing and a sand and gravel layer filled in the filter housing. The filter housing is inserted into the water tank and is detachably connected to the water tank. The bottom of the filter housing is provided with several drainage holes that communicate with the receiving cavity.
5. The in-situ improvement equipment for saline-alkali land according to claim 1, characterized in that, The porous water pipe is disposed on the surface of the saline-alkali land to be desalinated area. Multiple spray hole groups are spaced apart along the axial direction of the porous water pipe. Each spray hole group includes multiple spray holes spaced apart along the circumference of the porous water pipe, and the spray holes are concentrated in the lower half of the porous water pipe.
6. The in-situ improvement equipment for saline-alkali land according to claim 5, characterized in that, It also includes a plastic film, which is laid on the surface of the saline-alkali land to be desalinated area, and the porous water pipe is located below the plastic film.
7. The in-situ improvement equipment for saline-alkali land according to claim 1, characterized in that, One end of the porous water pipe is vertically inserted into the interior of the saline-alkali land to be desalinated area, and multiple spray holes are arranged around the periphery of the porous water pipe.
8. The in-situ improvement equipment for saline-alkali land according to claim 7, characterized in that, The porous water pipe is inserted into the saline-alkali land to be desalinated area to a depth of more than 0.5m, and the cathode is located below the porous water pipe.
9. The in-situ improvement equipment for saline-alkali land according to claim 1, characterized in that, It also includes a dosing tank and a mixing tank. The mixing tank is located between the drip irrigation device and the water tank. The mixing tank is equipped with a stirrer for stirring rainwater. The dosing tank is used to store the amendment. The dosing tank is connected to the mixing tank to input the amendment into the mixing tank.
10. A method for improving saline-alkali land, characterized in that, The desalination treatment of saline-alkali land using the in-situ saline-alkali land improvement equipment according to any one of claims 1 to 9 specifically includes the following steps: Step S1: Monitor the humidity and rainfall of the saline-alkali land to be desalinated area. When the humidity value of the saline-alkali land to be desalinated area exceeds the set value, turn on the electroosmosis device and the drainage device. Step S2: When the rainfall is lower than the set value, turn on the drip irrigation device, and the rainwater collected in the water storage device is sprayed into the saline-alkali land area to be desalinated through the drip irrigation device. Step S3: After the rainwater in the water storage device is depleted, turn off the electroosmosis device and the drainage device, and test the salt content of the saline-alkali land to be desalinated area.