Arid area farmland salt stain improvement method utilizing unidirectional permeable membrane

Abstract

The invention relates to an arid area farmland salt stain improvement method utilizing a unidirectional permeable membrane. The method comprises the steps that the unidirectional permeable membrane isarranged below a crop cultivation layer, when deep soil water and salt are blocked to move upwards to crop cultivation layer soil, irrigation water can be kept to enter lower layer soil by penetrating through the unidirectional permeable membrane freely, and then the irrigation and salt leaching effects are guaranteed while blocking salt moving-up caused by water moving-up. The structure principle of the unidirectional permeable membrane is that in the irrigation water infiltration process, salt in the soil is dissolved, under the action of gravity, infiltration is conducted through a fine sand layer on the upper portion of the unidirectional permeable membrane, particle filtration is conducted, under the action of the gravity of the irrigation water, a non hot welding area of the unidirectional permeable membrane is opened, and the irrigation water and dissolved salt can enter the unidirectional permeable membrane lower layer smoothly; when the underground water level raises and deepsoil moisture moves upwards, under the action of the upward pressure, the non hot welding area of the unidirectional permeable membrane is in a close state, and then water moving-up is blocked, and the purpose of long-term salt leaching s achieved.

Description

technical field [0001] The invention relates to a long-term improvement method for farmland salt spots in arid regions. Background technique [0002] The improvement and control of salt spots has always been a difficult problem in the field of saline-alkali land management. The causes of salt spots are related to climate, hydrogeography, micro-topography, soil quality, soil structure, drainage difficulties, and biological salt accumulation. The direct cause is the movement and the surface aggregation of the salt. Existing techniques for improving salt spots include foreign soil, irrigation and salt drainage (salt washing), planting salt-tolerant plants for biological salt drainage, and organic fertilizers to fertilize the soil. As Chinese Patent Application No. 200710180033.9 describes a method for improving saline-alkali spot land in farmland, first fix a cement pipe with holes in the sand gravel, pipe wall, water inlet, water diversion ditch, sump, The dry well composed ...

AI Technical Summary

Problems solved by technology

For this reason, our team has developed a long-term improvement method for the original soil of farmland salt spots that combines the gravel layer and geotextile infiltration structure with plant desalination (patent number 201410754199.7). Although this method is effective, it still faces a large demand for sand and gravel , the problem of high transportation and construction costs

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