Rainwater-harvesting permeability-enhancing and evaporation-inhibiting method for improving saline and alkaline lands locally

Abstract

The invention discloses a rainwater-harvesting permeability-enhancing and evaporation-inhibiting method for improving saline and alkaline lands locally. The rainwater-harvesting permeability-enhancing and evaporation-inhibiting method is characterized by comprising the following steps of: (1) drawing square grids on the saline and alkaline lands to be improved; (2) digging a pit out in each square grid to form a terrain which is low in the middle and high in the periphery; (3) covering a watertight mulching film on the square grid of each dug pit compactly; (4) forming a circular soil hole with a certain depth and diameter in the center of each square grid, and taking saline-alkali soil in a tunnel opening out, and filling isopyknic coarse sand into the soil hole to form a permeability-enhancing hole; (5) during rainfall, collecting rainwater, so that the rainwater permeates into the saline-alkali soil by the permeability-enhancing hole, and eluting to form a local low saline-alkali distribution area at the periphery of the permeability-enhancing hole; and (6) when the content of salinity meets the preset requirement, planting trees or crops at the periphery of the permeability-enhancing holes. According to the rainwater-harvesting permeability-enhancing and evaporation-inhibiting method, limited rainfall is centralized, and the evaporation of ground water is inhibited by utilizing a rainwater-harvesting technology and a mulching film coverage means comprehensively, so that the quality of the saline-alkali soil can be improved effectively, the transformation cost is low, and the lasting period is long.

Description

Technical field: [0001] The invention relates to the technical field of saline-alkali land treatment, in particular to a local improvement method for saline-alkali land by collecting rainwater, increasing infiltration and suppressing evaporation. Background technique: [0002] Soil salinization has become a global problem, and has received special attention from the fields of agriculture, resources and environment all over the world. All kinds of saline-alkali land are often caused by the joint action of many factors under certain natural conditions. Among them, the main factors affecting the formation of saline-alkali land are climatic conditions, geographical conditions, soil texture conditions, groundwater, the influence of rivers and sea water, etc., and are also affected by human activities, such as land use methods, agricultural farming methods, water conservancy engineering facilities and other factors. The amount of saline soil resources in my country is large and w...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a local improvement method of saline-alkali land by collecting rain, increasing seepage and suppressing steam, mainly solving the problems of large investment, high cost, large water consumption for leaching, and Insufficient use of rainfall resources and other issues