A method for afforestation on inland saline-alkali land

Abstract

The invention discloses an inland saline and alkaline land forestation method which includes the steps: digging a planting pit or planting furrow in a saline and alkaline land; spraying polyurethane solution to the bottom and the inner wall of the planting pit, and solidifying the polyurethane solution to form a pit bottom salt isolation layer and an inner wall salt isolation layer; digging a slope surface in the periphery of the planting pit along the inclination angle of 15-30 degrees, spraying polyurethane solution to the planting pit and the slope surface and solidifying the polyurethane solution to form a salt rejection layer when filling the planting pit with tree seedlings and matrixes and compacting the planted matrixes to be less than or equal to 10cm away from the top of the planting pit; covering the salt rejection layer with soil discharged in digging of the slope surface. According to the method, the salt content of a plant root system within a growth range is reduced, absorption of water and nutrient in the soil by the root system is promoted, inland high cold region oasis saline and alkaline land forestation survival rate and preservation rate are increased, engineering construction cost is saved, land quality is improved, land output is improved step by step, and better social and economic benefits are brought for inland high cold region saline and alkaline landareas.

Description

technical field [0001] The invention relates to an afforestation method, in particular to an afforestation method on saline-alkali land in an inland alpine region. Background technique [0002] Salinity is the second largest abiotic stress to plants after drought. According to the statistical results of the United Nations Educational, Scientific and Cultural Organization (UNESCO) and the Food and Agriculture Organization (FAO), there are about 955 million hm 2 saline-alkali land. The total area of ​​saline-alkali soil in my country is about 99 million hm 2 , The distribution range is very wide. Among them, the oasis saline-alkali land in the inland alpine area is an arid inland basin, with little rainfall and strong evaporation. In the process of runoff, the groundwater and the parent rock continue to dissolve and leach. During the flow of groundwater, the water body is continuously salinized, which makes the groundwater highly mineralized. Water is continuously lost due...

AI Technical Summary

Problems solved by technology

[0007] 1. Concealed pipe and vertical shaft salinization and alkali drainage method: the initial effect is good, but the investment is huge, the process is complicated, and it is easy to be blocked in the later stage, and the treatment effect is obviously reduced

[0008] 2. Alien-soil method: the initial effect of afforestation is better, but the investment is large, and the original soil is destroyed

And with the passage of time, water and salt continue to move, and the soil of the afforestation land returns to salinity, which greatly reduces the control effect

[0009] 3. Soil improvement method: applying chemical fertilizers, soil improvers, etc., the cycle is long, the treatment effect is slow, and it is easy to return to salt

There are still many problems such as large investment and poor effect in the existing single technology, resulting in extremely low survival rate of afforestation in saline-alkali land in inland alpine regions

Especially in the salt-blocking and salt-separating technologies, not only the cost is high, it is not easy to transport, but also the effect of water and moisture conservation is not significant, etc.

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