Improvement method of coastal saline land

Abstract

The invention discloses an improvement method of a coastal saline land. The improvement method comprises the following steps: A, ditching underground of a soil layer of a saline land to be improved, laying a closed conduit and forming a closed conduit draining layer; B, performing deep scarification on the saline land soil layer located at the upside of the closed conduit draining layer; C, performing the laser flattening on the saline land soil layer after the deep scarification; D, applying desulfurization gypsum to the soil after the laser flattening; E, mixing the desulfurization gypsum with soil evenly; F, filling water and irrigating the land to remove salt and alkali. The improvement method has the following advantages: salt and alkali removal of the coastal saline land can be quickly carried out; soil pore space is effectively bettered, and soil infiltration ability is improved; water soluble salt sprayed from the soil rapidly and replaced exchange salt are discharged through the closed conduit; the improvement method is high in economical efficiency and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of saline-alkali land improvement engineering, and in particular relates to a method for improving coastal saline-alkali land. Background technique [0002] There are large areas of saline-alkali land distributed in our country, and the degree of salinization is expanding, such as coastal areas. Coastal saline-alkali land is mostly high-sodium-salt muddy marine extremely fine-grained clay, with poor soil permeability, and the surface soil quickly forms compaction after being soaked by precipitation or irrigation water, the soil infiltration capacity is further reduced, and water is easy to form under heavy rain or rainstorm conditions. Due to the blocking of the dense silt and silt layer of the soil, the proportion of water infiltrated into the soil to wash the salt and discharged through the hidden pipe is relatively low, and the effect of fast desalination of the dark pipe is not obvious; the hydrogeologic...

AI Technical Summary

Problems solved by technology

Coastal saline-alkali land is mostly high-sodium-salt muddy marine extremely fine-grained clay, with poor soil permeability, and the surface soil quickly forms compaction after being soaked by precipitation or irrigation water, the soil infiltration capacity is further reduced, and water is easy to form under heavy rain or rainstorm conditions. Due to the blocking of the dense silt and silt layer of the soil, the proportion of water infiltrated into the soil to wash the salt and discharged through the hidden pipe is relatively low, and the effect of fast desalination of the dark pipe is not obvious; the hydrogeological conditions of the coastal saline-alkali land determine Poor ventilation of the soil profile is not conducive to the growth of plant roots and the absorption and desalination of plants. In addition, the depth of groundwater is shallow, and the desalinated soil is very easy to return to salt, which increases the difficulty of desalination and alkali treatment in saline-alkali land.