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

Abstract

The invention discloses an ecological engineering regulation method for fast reducing salinity of a sand coated district which belongs to the marine solonchak improving method technical field. The invention comprises: firstly, making out a whole plane; secondly, implementing dredgepump filling to form a soil layer with the upper part rough and the lower part fine; thirdly, a gutter is arranged with a depth of over two meters and a space between of less than two hundred meters to control the flow direction of groundwater flow of strip check and to realize an entire desalinisation to prevent the uprise of salt. The invention forms a new soil layer structure with the upper part rough and the lower part fine, increases a coarse sand content of upper soil and obviously improves soil tilth; thereby facilitating the leaching of the salt. Only half a year is needed and then the salt content of a plow layer is reduced from six point five four gram per kilogram to one point two three gram per kilogram; thereby speeding up the improvement and utilization speed of the marine solonchak and restraining the uprise of salt. The invention reduces the governance process for the marine solonchak, speeds up a startup time, has obvious economic benefits and is applicable to the marine solonchak district and can be popularized and applied in the sand coated district.

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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