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Method for improving severe saline-alkali soil by using open trench and hidden filler layer

A technology of heavy saline-alkali land and filling layer, which is applied in the direction of soil preparation, application, and restoration of polluted soil. It can solve problems such as difficult to completely improve saline-alkali land, large amount of fresh water, land reverse seepage, etc., and achieve slope protection to prevent farming soil loss and improve Soil quality, anti-evaporation effect

Active Publication Date: 2012-02-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, these water conservancy engineering measures generally have problems such as large fresh water consumption, serious land infiltration phenomenon, and difficulty in thoroughly improving saline-alkali land; due to the limited source of fresh soil and sandy soil, measures such as replacement of surface saline-alkali soil and sand pressing are not feasible in large areas. Difficult to popularize when improving saline-alkali land

Method used

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  • Method for improving severe saline-alkali soil by using open trench and hidden filler layer
  • Method for improving severe saline-alkali soil by using open trench and hidden filler layer
  • Method for improving severe saline-alkali soil by using open trench and hidden filler layer

Examples

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Effect test

Embodiment 1

[0024] The method for improving severe saline-alkali land with open ditch and dark filler layer described in this example is applicable to the improvement of severe saline-alkali land with groundwater depth greater than 1.1m and area of ​​saline-alkali land less than or equal to 5 mu. figure 1 , figure 2 with Figure 5 As shown, the specific method is:

[0025] (1) In the saline-alkali land, several deep ditches with a width of 1.0m and a depth of 1.1m are dug out by mechanical equipment along the east-west direction, and the distance between each deep ditch is 6m. 20% of. Place the 30cm-thick mellow soil excavated below the ground in a concentrated manner, and place the 80cm-thick raw soil downwards in a concentrated manner.

[0026] (2) Dig out the main row of saline-alkali ditches 1 along the north-south direction with the upper and lower widths of 1.4m-1.6m and 0.5m-0.6m and a depth of 70cm, and the distance between each main row of saline-alkali ditches 1 is 15m-20m ...

Embodiment 2

[0034] The method for the improvement of severe saline-alkali land by the dark filling layer of the open ditch described in this embodiment is applicable to the reconstruction of severe saline-alkali land with a groundwater depth greater than 1.1m and an area of ​​saline-alkali land greater than 5 mu and less than or equal to 20 mu, such asfigure 1 , image 3 with Figure 5 As shown, the specific method is:

[0035] (1) In the saline-alkali land, a number of deep ditches with a width of 1.0m and a depth of 1.1m are dug along the east-west direction, and the distance between the ditches is 6m. The area of ​​all the ditches accounts for 25% of the total area of ​​the saline-alkali land. . Place the 30cm-thick mellow soil excavated below the ground in a concentrated manner, and place the 80cm-thick raw soil downwards in a concentrated manner.

[0036] (2) Excavate the main row of saline-alkali ditches 1 along the north-south direction with the upper and lower widths of 1.4m-1.6...

Embodiment 3

[0044] The method for improving severe saline-alkali land with open ditch and dark filler layer described in this example is applicable to the improvement of severe saline-alkali land with groundwater buried depth greater than 1.1m and area of ​​saline-alkali land greater than 20 mu, such as figure 1 , Figure 4 with Figure 5 As shown, the specific method is:

[0045] (1) In the saline-alkali land, several deep ditches with a width of 1.0m and a depth of 1.1m are dug along the east-west direction, and the distance between the ditches is 6m. The area of ​​all the ditches accounts for 30% of the total area of ​​the saline-alkali land. . Place the mellow soil excavated 30cm below the ground in a concentrated manner, and then place the raw soil 80cm down.

[0046] (2) Along the north-south direction, excavate the main row of saline-alkali ditches 1 with the upper and lower widths of 1.4m-1.6m and 0.5m-0.6m and a depth of 75cm. The distance between each main row of saline-alkal...

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Abstract

The invention relates to a method for improving severe saline-alkali soil by using an open trench and hidden filler layer, which comprises the following steps of: (1) digging a pit in the saline-alkali soil, and filling filler at the bottom of the dug pit to form a salt and alkali removing filler layer; (2) digging a salt and alkali removing trench which is positioned above and communicated with an underground salt and alkali removing filler layer, and performing stone pitching on the salt and alkali removing trench; and (3) removing salt and alkali from the whole saline-alkali soil by natural rainfall or irrigation. By performing stone pitching on the salt and alkali removing trench and arranging the salt and alkali removing filler layer, the salt and alkali removing trench has a good anti-seepage effect and the characteristic of preventing cultivated soil from being lost by slope protection, and can be effectively used for a long time, and the salt and alkali removing filler layer breaks the formation of capillaries in the soil effectively and prevents shallow groundwater from being evaporated; and by a method for controlling the upward movement of salt formed by evaporation by cutting an evaporation channel through the filler layer, the salt is difficult to move upwards and aggregate, the problem that surface water is evaporated to form the salt is radically solved, and theaim of effectively improving soil property for a long time is fulfilled.

Description

technical field [0001] The invention relates to a new method for soil improvement, in particular to a method for improving severe saline-alkali land by using open ditch and dark filling layers. Background technique [0002] As the process of urbanization continues to accelerate, the area of ​​cultivated land in our country is decreasing day by day. The saline-alkali soil contains excessive salt, toxic substances, excessive alkalinity, and poor soil properties, resulting in hardening of the saline-alkali land, and only some saline-alkali grasses grow. , is a great waste of land resources. At present, my country has an area of ​​36.3 million hectares of saline-alkali land, and due to unreasonable activities, the area of ​​saline-alkali land has continued to expand, and the degree of salinization has gradually intensified. The biggest obstacle to ecological environment construction and sustainable agricultural development in my country has made saline-alkali land treatment and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00A01B79/02
Inventor 张建任延刚任亮张成禄王金鹤亓鹏玉李聪
Owner SHANDONG UNIV
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