Method for improving rainfall leaching efficiency of coastal saline-alkali soil by using garden waste

Abstract

The invention provides a method for improving the rainfall leaching efficiency of coastal saline-alkali soil by using garden waste. The method comprises the following steps that (1), the garden waste is classified; (2), substances which can be used for composting are composted; (3), substances which are not suitable for composting are treated and bound; (4), the bound substances which are not suitable for composting are paved to form a salt isolation layer; and (5), the compost material and the saline-alkali soil layer are mixed and stirred by layer and the mixture layer is paved by layer. The porosity of the soil is reduced layer by layer from the surface layer to the bottom layer through layered mixing, so that surface water rapidly infiltrates into the upper soil body, the leaching time of the upper soil is guaranteed, the capillary action is weakened, soil water and salt are inhibited from moving to the surface layer of the soil, surface soil salt accumulation is relieved, and branches and the like which are not easy to decompose in the garden waste are arranged as the salt isolation layer; and on the one hand, underground water is isolated, on the other hand, the hydraulic gradient of soil above the salt isolation layer is increased, and the leaching efficiency is improved.

Description

technical field [0001] The invention belongs to the field of saline-alkali land management, and in particular relates to a method for improving the rainfall leaching efficiency of coastal saline-alkali land by using garden waste. Background technique [0002] In the northern coastal areas of my country, especially the estuaries of rivers, the buried depth of groundwater is high, the degree of salinity is high, and the intrusion of seawater is obvious. Large areas of land are formed by river sedimentation and seabed mud dredging, and the soil texture is extremely poor. Without soil structure, large volume, small pores, strong soil capillary action, high salinity groundwater is easy to migrate to the surface soil layer under evaporation, resulting in the formation of saline-alkali land. Moreover, the soil permeability is poor, and the rainfall is relatively concentrated. The total amount of soil infiltration after a single rainfall is small, and a large amount of rainfall does ...

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Problems solved by technology

Moreover, the soil permeability is poor, and the rainfall is relatively concentrated. The total amount of soil infiltration after a single rainfall is small, and a large amount of rainfall does not participate in the leaching of saline-alkali soil, which will form surface runoff and then be lost, resulting in very low soil salt leaching efficiency in atmospheric rainfall. Rainfall infiltration is far less than soil evaporation, and soil salinity in saline-alkali land continues to rise after insufficient leaching

[0003] With the gradual acceleration of urbanization and people's high requirements for urban ecology, the area of ​​urban landscaping is increasing, and the amount of garden waste such as tree trimmings, lawn trimmings, litter and leaves produced during plant growth There are more and more, and the simplest way to deal with garden waste is direct incineration. Direct incineration is not only easy to cause air pollution, but also a waste of resources

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