Construction method and system for drainage and salt leaching of soil in saline-alkali soil

Abstract

The invention discloses a construction method for drainage and salt leaching in saline-alkali soil. The method comprises the following steps that 1, several longitudinal trenches are dug in the parallel direction of the road, intervals are arranged every 60-100 meters in the longitudinal trenches, and the two sides of the adjacent intervals incline to the middle, wherein the inclined slope is 0.35-0.5%; 2, in the vertical direction of the road, multiple transverse trenches are dug and led to municipal road drainage pipelines, wherein the gradient of the transverse trenches is 0.35-0.5%; 3, thebottoms of the trenches are tamped and then uniformly filled with stones and yellow sand, and the stones, the yellow sand and earthwork are separated through non-woven fabrics; 4, HDPE double-wall corrugated pipes are used for connection at the junctions of the stone blind trenches and the municipal road drainage pipelines, and the joints are blocked through non-woven fabrics; 5, inspection wellsare constructed at the junctions of the trenches; 6, before backfill planting soil modeling, fresh water is utilized for irrigation and leaching, and the salt content is reduced. Accordingly, the transformed region has the long-term suppression effect on salt return, by connecting with a municipal pipe network, the underground water level of the region can be lowered, and water level rise and reclaimed salinization caused by transpiration can be controlled.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and ecology, and in particular relates to a construction method and a system for draining and washing salt in saline-alkali soil soil. Background technique [0002] Soil salinization (soil salinization) refers to the increase in the content of salt ions in the soil or the continuous accumulation of soluble salt ions to the soil surface, which destroys the physical and chemical characteristics of the soil and has a great harmful effect on ground plants. process of soil evolution. Due to the accumulation of a large amount of salt in the soil, saline-alkali land will deteriorate the physical and chemical properties of the soil, such as soil viscosity, poor air permeability, high bulk density, slow rise in soil temperature, slow water release, low permeability coefficient, and strong capillary action. It is more difficult to carry out green planting in such harsh soil environment con...

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Problems solved by technology

It is more difficult to carry out green planting in such harsh soil environment conditions, there are few types of plants suitable for planting in saline-alkali land, the survival rate of seedling planting is low, and the cost of planting and maintaining greening is high. These problems have become the bottleneck of greening development in coastal saline-alkali areas.

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