Saline-alkali land treatment method

Abstract

The invention discloses a saline-alkali land treatment method comprising the steps of surveying saline-alkali land and a ground water zone under the surface of the saline-alkali land and building a water pumping device, a perched river and a reservoir, wherein the bottom of the perched river is higher than the lowest part of the surface of the saline-alkali land; the water pumping device is used for pumping the ground water in the ground water zone into the perched river or the reservoir; and the height difference between the ground water level of the ground water zone and the lowest part of the surface of the saline-alkali land is a number value that is not likely to cause a capillary force. The water pumping device is used for pumping the ground water in the ground water zone and discharging the ground water into the perched river or the reservoir, so as to ensure that the height difference between the ground water level of the ground water zone and the lowest part of the surface of the saline-alkali land is the number value that is not likely to cause the capillary force; and meanwhile, the ground water flows into the reservoir in virtue of the osmosis of soil to permanently keep the height difference between the peripheral ground water level and the surface of saline-alkali land, so as to improve the earthiness of the saline-alkali land.

Description

technical field [0001] The invention relates to a new technology for soil improvement, in particular to a treatment method for saline-alkali land. Background technique [0002] There are 954 million hectares of saline-alkali land in the world, and 99.133 million hectares of saline-alkali land in China. Part of the saline-alkali land belongs to cultivated fields. These fields are basically medium and low-yield fields, which directly affect human food security. In the arable fields, there are often saline-alkali lands that do not grow any grass, ranging from tens of thousands of square meters (generally in a low-lying terrain) to a few square meters in size. Due to the poor water permeability of saline-alkali land, when flood irrigation occurs, most of the ground water will flow along the surrounding area. Good underground infiltration, the saline-alkali leaching in saline-alkali land is very small, and new saline-alkali is washed with the water. Because the saline-alkali la...

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Problems solved by technology

All of the above have played a relatively positive role to varying degrees, but there are also some shortcomings. Some governance methods are single, not comprehensive governance, and only focus on improved governance, and the governance speed is too slow; some maintain a short period of time and tend to rebound ; Some treatment applications have few raw material resources and are difficult to collect and utilize; some treatment consumes too much manpower and material resources, and the cost is high; some treatment is prone to other adverse effects on geology, water quality, environmental ecology, etc.

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