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Method for preventing saline-alkali soil salt return by utilizing salt isolation layer

A technology for saline-alkali land and salt-separating layer, applied in the field of soil treatment and saline-alkali land treatment, can solve the problems of secondary pollution, unfavorable promotion and use, etc., and achieve the effect of increasing soil organic matter, reducing the content of harmful microorganisms, and inhibiting the return of soil salt.

Pending Publication Date: 2021-04-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, plastic film covering will cause secondary pollution to the environment, which is not conducive to popularization and use

Method used

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  • Method for preventing saline-alkali soil salt return by utilizing salt isolation layer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this embodiment, the coastal saline-alkali land of Haixing County, Cangzhou City, Hebei Province is used as the experimental site. Lay the salt barrier as follows:

[0030] (1) On the above-mentioned coastal saline-alkali land, delineate the plot to be tested;

[0031] (2) The soil in the experimental area was plowed, and 50 cm thick soil was removed.

[0032] (3) at figure 1 A 5cm-thick iron tailings salt barrier layer is evenly laid at the position shown in middle 2, and the particle size of the iron tailings does not exceed 1cm;

[0033] (4) at figure 1 A 15cm-thick straw salt barrier layer is evenly laid at the position shown in middle 3, and the selected straw is wheat straw, and the length of the straw does not exceed 5cm;

[0034] (5) at figure 1 A 4cm-thick biochar salt barrier layer is evenly laid at the position shown in middle 4, and the selected biochar is the biochar obtained by pyrolyzing wheat straw in a 400°C pyrolysis furnace in the laboratory; ...

Embodiment 2

[0038] In this embodiment, the coastal saline-alkali land of Haixing County, Cangzhou City, Hebei Province is used as the experimental field. Lay the salt barrier as follows:

[0039] (1) On the above-mentioned coastal saline-alkali land, delineate the plot to be tested;

[0040] (2) The soil in the experimental area was plowed, and 60 cm thick soil was removed.

[0041] (3) at figure 1 A 7cm-thick iron tailings salt barrier layer is evenly laid at the position shown in middle 2, and the particle size of the iron tailings does not exceed 1cm;

[0042] (4) at figure 1 A 17cm-thick straw salt barrier layer is evenly laid at the position shown in middle 3, and the selected straw is wheat straw, and the length of the straw does not exceed 5cm;

[0043] (5) at figure 1 A 6cm-thick biochar salt barrier layer is evenly laid at the position shown in middle 4, and the selected biochar is the biochar obtained by pyrolyzing wheat straw in a 400°C pyrolysis furnace in the laboratory;...

Embodiment 3

[0047] In this embodiment, the coastal saline-alkali land of Haixing County, Cangzhou City, Hebei Province is used as the experimental field. Lay the salt barrier as follows:

[0048] (1) On the above-mentioned coastal saline-alkali land, delineate the plot to be tested;

[0049] (2) The soil in the experimental area was plowed, and 70 cm thick soil was removed.

[0050] (3) at figure 1 A 10cm-thick iron tailings salt barrier layer is evenly laid at the position shown in middle 2, and the particle size of the iron tailings does not exceed 1cm;

[0051] (4) in figure 1 A 20cm-thick straw salt barrier layer is evenly laid at the position shown in 3, wherein the selected straw is wheat straw, and the length of the straw does not exceed 5cm;

[0052] (5) at figure 1 A 8cm-thick biochar salt barrier layer is evenly laid at the position shown in middle 4, and the selected biochar is the biochar obtained by pyrolyzing wheat straw in a 400°C pyrolysis furnace in the laboratory;

...

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Abstract

The invention relates to a method for preventing saline-alkali soil salt return by utilizing a salt isolation layer. The method includes the steps of ploughing a saline-alkali soil layer with the thickness of 50-70cm, and removing ploughed soil; laying an iron tailing layer with the thickness of 5-10 cm; laying a straw layer with the thickness of 15-20 cm; laying a charcoal layer with the thickness of 4-8 cm; and conducting saline-alkali soil backfill. According to the method for preventing saline-alkali soil salt return by utilizing the salt isolation layer, the gathering speed of bottom salt on an earth surface can be reduced, and the effect of inhibiting soil salt return is achieved; the pH and the salt content of surface soil can be effectively reduced, the content of organic matters in the soil is increased, and a proper soil environment can be provided for plant growth; the salt isolation layer prepared from two solid wastes and biochar can achieve the effect of inhibiting soil salt return, turns waste into wealth, and improves the economic, social and environmental benefits; and the method has the characteristics of strong operability, good effect, high benefit and capability of being popularized and used in a large scale.

Description

technical field [0001] The invention relates to the field of soil treatment, specifically the field of saline-alkali land treatment, in particular to a technique for preventing saline-alkali land from returning to salt by using a salt barrier. Background technique [0002] Soil salinization and secondary salinization are serious problems affecting agricultural production and ecological environment. At present, about 20% of the cultivated land and nearly 50% of the irrigated farmland in the world are seriously affected by the high concentration of salinity in the soil, which reduces the yield of agricultural products. my country is a big country with saline-alkali land. According to incomplete statistics from UNESCO and FAO, the total area of ​​saline-alkali land in my country is 99.13 million hectares, accounting for 10.4% of the global saline-alkali land area, ranking third in the world. [0003] There are many reasons for the formation of saline-alkali land, including nat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02
CPCA01B79/02
Inventor 崔兆杰宋婷婷孙晓梅崔晓玮张颖
Owner SHANDONG UNIV
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