CN114430952A

CN114430952A - Saline-alkali soil treatment method

Info

Publication number: CN114430952A
Application number: CN202111659961.XA
Authority: CN
Inventors: 岳新积; 张银玲; 刘志龙; 刘晋青; 杨云峰; 亢开云; 武鹏; 刘娟; 贺澜; 马宏伟; 李日龙; 武彦君
Original assignee: Shanxi Zhide Environmental New Material Co ltd; Shanxi Zhide Modern Agricultural Technology Co ltd; Shanxi Zhide Ecological Environmental Protection Co ltd
Current assignee: Shanxi Zhide Environmental New Material Co ltd; Shanxi Zhide Modern Agricultural Technology Co ltd; Shanxi Zhide Ecological Environmental Protection Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-05-06

Abstract

The invention relates to a method for treating saline-alkali soil, which belongs to the technical field of saline-alkali soil treatment and specifically comprises the steps of excavating the saline-alkali soil, taking out mellow soil on the surface layer and forming shallow pits; carrying out deep excavation on the shallow pit, and taking out raw soil in the deep pit to form the deep pit; leveling the bottom and the side walls of the pit, compacting the bottom and compacting the side walls; spraying closed isolation slurry on the bottom and the side walls of the pit to form an isolation layer; after the isolation layer is completely solidified, backfilling the taken raw soil into the deep pit; mixing the taken-out mature soil with the soil conditioner to form improved soil, and then backfilling the improved soil above the raw soil in the pit until the soil is completely filled; the invention adopts the isolation layer, cuts off the water gushing channel of the capillary, and combines with the soil improvement, thus fundamentally achieving the purpose of treating the saline-alkali soil.

Description

Saline-alkali soil treatment method

Technical Field

The invention relates to a method for treating saline-alkali soil, belonging to the technical field of saline-alkali soil treatment.

Background

At present, the saline-alkali soil improvement method mainly comprises water conservancy improvement, chemical improvement, agricultural improvement, biological improvement, salt-tolerant green manure planting, engineering and other methods, although great effect is achieved, the index is not the basis, the salt can be returned once again along with the rising of capillary water, and if the water is not solved fundamentally, the saline-alkali soil is difficult to be thoroughly treated.

In recent years, the technology of salt discharge by underground concealed pipes is developed rapidly, salt in soil is discharged with water according to the principle that salt comes with water, and water is dispersed with salt and retained, and the underground water level is controlled below a critical depth, so that the purposes of soil desalination and secondary salinization prevention are achieved. How to radically cure saline-alkali soil is a technical problem to be solved.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a method for treating saline-alkali soil, which adopts a mode of isolating and cutting off a water upwelling channel of a capillary and combines with soil improvement to fundamentally achieve the aim of treating the saline-alkali soil.

In order to achieve the purpose, the technical scheme adopted by the invention is a saline-alkali soil treatment method, which comprises the following steps,

a. excavating the saline-alkali soil, and taking out mellow soil on the surface layer to form a shallow pit;

b. deeply digging the shallow pit, and taking out raw soil in the pit to form a deep pit;

c. and leveling the bottom and the side walls of the pit, compacting the bottom and compacting the side walls.

d. Spraying closed isolation slurry on the bottom and the side walls of the pit to form an isolation layer;

e. after the isolation layer is completely solidified, backfilling the raw soil into the deep pit, and leveling;

f. mixing the mature soil and the soil conditioner to form improved soil, and then backfilling the improved soil above the raw soil in the pit until the soil is completely filled.

Preferably, before the saline-alkali soil is excavated, the saline-alkali soil is divided into a plurality of areas, soil samples are respectively collected on the surface of the soil and at depths of 10cm, 20cm, 30cm and 40cm in each area, soil detection is carried out, the pH, the total salt content, the organic matters, the cation exchange capacity, the total nitrogen, the quick-acting potassium and the effective phosphorus of the soil are detected, and the corresponding soil conditioner is selected according to the components.

Preferably, the depth of the shallow pit is 20-40cm, and the depth of the deep pit is 35-70 cm.

Preferably, the thickness of the closed isolation layer is 1-3cm, and the closed isolation layer is naturally cured after spraying, wherein the curing time is 10-12 h.

Preferably, the isolation layer is formed by coating slurry formed by adding water into a sealing isolation material and stirring the slurry on the bottom and the side walls of the pit, and the sealing isolation material is ZD-FB1 produced by Shanxi Zhide environmental new material company Limited.

Preferably, the mass ratio of the mellow soil to the soil conditioner is 200 (1-3).

Compared with the prior art, the invention has the following technical effects: the invention thoroughly solves the saline-alkali harm from the source, improves the saline-alkali, improves the soil quality and achieves two purposes; meanwhile, deep ploughing soil is adopted to form a pit groove, and a sealing isolation material is coated in the pit groove, so that the sealing isolation material can form a firm, durable, waterproof and anti-seepage isolation layer, can be sealed underground for a long time and cannot lose efficacy; the whole construction is simple, the efficiency is high, the cost performance is higher for the improvement of severe saline-alkali soil, and the land value promotion space is large.

Drawings

FIG. 1 is a schematic flow chart of the present invention.

In the figure: mature soil 1, shallow pit 2, immature soil 3, deep pit 4, isolation layer 5 and improved soil 6.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example one

The current situation is as follows: the lower zone of the alluvial plain at a saline-alkali land is mostly the alluvial mother material and the silt mother material, the horizontal stratification of the soil body is obvious, the sand is adhered to more interlayers, the surface texture is greatly different, the underground water level is shallow, the underground water level is 1-3 m more, the soil body is generally wet or moist, the water level is raised and lowered along with seasonal changes, the substance oxidation and reduction process is alternately carried out, and the rust spots of the manganese rust lines on the subsoil or the subsoil are generally obvious.

In the embodiment, a 40m × 40m grid is divided into a plurality of areas, the center of the grid is used as a sampling point, soil samples are respectively sampled at the depths of 10cm, 20cm and 30cm on the surface of soil at each point, the pH value is more than 9.05-10.39 through test analysis, the soil is alkaline or strongly alkaline, the salt content is 0.4-1.6 g/kg, the distribution of salt on the section of a soil body is gradually reduced from top to bottom, the content of organic matters of the soil is lower and is generally 4.7-16.6 g/kg, the content of soil nutrients is not high, the cation exchange capacity in the soil is 7.01-11.6cmol/kg, the content of water soluble nitrogen is 7.0-44.9 g/kg, the content of quick-acting potassium is 68.7-148 g/kg, the content of effective phosphorus is 0.5-4.1 mg/kg, and the soil fertility level is lower.

1. Excavating the surface mellow soil by an excavator to an excavation depth of 30cm to form a shallow pit 2, stacking the mellow soil 1 outside the field, excavating to a required depth, excavating the raw soil 3 at the lower part of the mellow soil 1 to an excavation depth of 20cm to form a deep pit 4, and stacking the raw soil and the mellow soil separately. And then, leveling the bottom in the pit, compacting by using a road roller, and tamping the side wall by using a hook machine.

2. And adding water into the closed isolation material, stirring to prepare mixed slurry, spraying the mixed slurry on the bottom of the deep pit and the surface of the side wall by using spraying equipment, wherein the spraying thickness is 25mm, and naturally solidifying for 10-12 hours to form the isolation layer 5.

3. Preparing a soil conditioner according to a soil detection result, mixing the excavated mellow soil with the soil conditioner, wherein the mellow soil comprises the following components in percentage by weight: soil conditioner =100: 1.

4. And after the isolation layer is solidified, backfilling the excavated raw soil into the pit, flattening, simply compacting, backfilling the improved mellow soil 6 to the surface of the raw soil, and simply compacting.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A method for treating saline-alkali soil is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

c. leveling the bottom and the side walls of the pit, compacting the bottom and compacting the side walls;

2. The saline-alkali soil treatment method according to claim 1, characterized in that: before the saline-alkali soil is excavated, the saline-alkali soil is divided into a plurality of areas, soil samples are respectively sampled on the surface of the soil and at depths of 10cm, 20cm, 30cm and 40cm in each area, soil detection is carried out, the pH, the total salt content, the organic matters, the cation exchange capacity, the total nitrogen, the quick-acting potassium and the effective phosphorus of the soil are detected, and a corresponding soil conditioner is selected according to the components.

3. The saline-alkali soil treatment method according to claim 1, characterized in that: the depth of the shallow pit is 20-40cm, and the depth of the deep pit is 35-70 cm.

4. The saline-alkali soil treatment method according to claim 1, characterized in that: the thickness of the closed isolation layer is 1-3cm, and the closed isolation layer is naturally cured after spraying, wherein the curing time is 10-12 h.

5. The saline-alkali soil treatment method according to claim 1, characterized in that: the isolation layer is formed by coating slurry formed by adding water into a closed isolation material and stirring the slurry on the bottom and the side walls of the pit, and the closed isolation material is ZD-FB1 model produced by Shanxi Zhide environmental new material company Limited.

6. The saline-alkali soil treatment method according to claim 1, characterized in that: the mass ratio of the mellow soil to the soil conditioner is 200 (1-3).