Method for primarily transforming saline and alkaline land by adopting engineering-chemical-desalination water saving technology

Abstract

The invention discloses a method for primarily transforming a saline and alkaline land by adopting an engineering-chemical-desalination water saving technology. The method comprises the following steps: S1, reducing salt content of soil in the saline and alkaline land to be processed step by step by engineering measures and isolating and discharging soluble salt in the soil; S2, reasonably utilizing water sources of the saline and alkaline land to be processed by utilizing a brackish water desalination technology; S3, reasonably irrigating the saline and alkaline land to be processed by utilizing a water-saving irrigation technology; S4, improving chemical ingredients of the saline and alkaline land to be processed by utilizing chemical measures. The method can carry out primary improving work on the saline and alkaline land in coastal areas and has short time and good effects.

Description

technical field [0001] The invention relates to a method for improving saline-alkali land, in particular to a comprehensive method for improving saline-alkali land by integrating engineering technology, biological technology, chemical technology, brackish water desalination technology, water-saving irrigation technology and information technology. Background technique [0002] With the deterioration of the ecological environment, soil salinization is expanding at an unprecedented speed. Therefore, rational use of saline-alkali land, thorough improvement of saline-alkali land, and cultivation of saline-alkali-resistant plant varieties will be the future development direction. [0003] As far as my country is concerned, the total population has reached 1.3 billion, and the total cultivated land area is less than 2 billion mu, but the total area of ​​saline-alkali land has reached 2.045 billion mu, and its area is constantly expanding; the per capita cultivated land and fresh w...

AI Technical Summary

Problems solved by technology

However, this method also has obvious defects: it is easy to cause secondary compaction of the soil, and the saline-alkali backlash is serious

Biological improvement requires the smallest investment, but the requirements for salt-tolerant plants are relatively high. It is necessary to have a better understanding of the salt-tolerant mechanism of halophytes, and biological improvement is often slow to take effect

[0017] Therefore, the effect of adopting the traditional single governance method is not ideal, and due to the serious mutual constraints among the various methods, simply integrating the traditional single governance method will only be time-consuming and laborious, and the effect will be extremely slow, and even some It may exacerbate the degree of saline-alkali land (for example, when chemical fertilizer improvement conflicts with biological improvement, it may lead to the death of organisms, and the absorbed salt re-enters the soil; when physical improvement conflicts with irrigation salt, it may cause the groundwater table of saline-alkali land to rise, seawater intrusion occurs)

Also because of this, there are many technical difficulties in combining various means to treat saline-alkali land