Soil improvement method of alkaline land by making leakage on earth's surface

Abstract

The invention relates to a soil improvement method for saline and alkaline land by creating leakage on the surface of the earth, comprising the following steps: leakage is created on a humus layer and a compact soil layer of the ground by shaft sinking until the shaft enters a hydrous sand soil layer; and coarse sandstone is filled in the shaft, and a pit mouth is covered by a grid plate sand net. Shaft sinking from the surface of the ground to the hydrous sand soil lay destroys the formation of capillary, thereby lowering the critical water level and eliminating salification. The soil improvement method for saline and alkaline land by creating leakage on the surface of the earth is simple, easy to carry out and low in cost; on one hand, the use of the shaft can lower the underground critical water level, destroy the formation of the capillary, prevent evaporation of underground shallow layer water and effectively solve the problem of formation of new saline and alkaline; and on the other hand, owing to the shaft sinking, a large quantity of water (such as rainfall)on the surface of the earth is caused to enter the underground water layer by the grid plate sand net and sandstone to clean the surface layer of the saline and alkaline land, so that the problem of evaporation and salifying of the surface water is completely solved, and the earthiness is effectively improved.

Description

technical field [0001] The invention belongs to a method for improving soil, in particular to a method for improving soil in saline-alkali land with leakage on the surface. Background technique [0002] Saline-alkali soils are lands where the soil contains excess soluble salts. Nearly 10% of the world's land is covered by different types of saline-alkali soil, mostly in arid and semi-arid areas. About half of the world's existing irrigated land is threatened by secondary salinization; at the same time, large areas of saline-alkali wasteland have been reclaimed through irrigation and drainage. The reason for land salinization is that the soil and groundwater are too salty. Under the action of strong surface evaporation, the shallow underground water is transported to the surface through capillary tubes to be evaporated. The salt is brought to the surface, and after the water is evaporated, the soil salt rises through capillary action and accumulates on the soil surface, and...

AI Technical Summary

Problems solved by technology

However, these measures have the disadvantages of inconspicuous desalination effect, incompleteness, large investment, high cost, complex engineering technology, and difficulty in popularization.

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