Ecological engineering regulation method for reducing salt content in the soil of sand coating region

Abstract

The invention discloses an ecological engineering treatment method for quickly reducing salt in sand-coated soil, and belongs to the technical field of improvement methods for coastal saline soil. Including: 1) Formulate the overall plan; 2) Implement mud pump filling to form a soil layer with a thick top and a thin bottom; 3) Set drainage ditches with a depth of more than 2 meters and a distance of less than 200 meters to control the flow direction of groundwater in the field (land) , to achieve the overall desalination of the soil and prevent return to salt. The present invention forms a new soil layer structure with a thick top and a fine bottom, increases the coarse sand content of the upper soil, and significantly improves soil plowability; it is conducive to the leaching of salt, and the salt content of the plow layer can be increased from 6.54g in only half a year / kg was reduced to 1.23g / kg, which accelerated the improvement and utilization of coastal saline soil and inhibited the phenomenon of salt return. The invention shortens the treatment process of coastal saline soil, accelerates the production period, and has remarkable economic benefits, and can be popularized and applied in coastal saline soil areas, especially in sand-coated areas.

Description

technical field [0001] The invention relates to the technical field of soil improvement, in particular to a method for improving coastal saline soil. Background technique [0002] Salinity-alkali hazard is one of the most important obstacle factors existing in the soil in my country and even in the world, and it is also the primary problem to be solved in coastal saline soil improvement. In the past, in coastal saline soil improvement technical measures for salt reduction, according to different textures and water conservancy conditions, shallow and dense drainage system engineering measures were mainly adopted, and two methods of open drainage and hidden drainage were implemented. In Qiantangjiangwan sand coating in Zhejiang Province, the elevation of the coating surface is generally low, and open row is usually used, that is, ditches are opened on the coating surface, and the salt ions in the soil and stagnant water are brought to the soil surface by using the rising effec...

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Problems solved by technology

[0004] The purpose of the present invention is to aim at the long period and instability of the traditional shallow-dense drainage improvement measures of coastal saline soil in the past, and in the conventional use of mud pump water conservancy projects, the natural flow of mud water from high to low caused by the bottom thick and top fine The soil structure is more likely to return salt. On the basis of the overall planning, a set of mud pump technology is used to implement reasonable control of the flow of mud water, forming a soil structure with a thick top and a thin bottom, and rationally setting deep drainage ditch facilities to reach the coastal waters. Saline soil can not only quickly desalinate, but also improve the texture of the soil plow layer and prevent the return of salt. An ecological engineering treatment method for rapid salt reduction in sand-coated areas

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