Vegetation recovery method for soil discharging field in acidic mining area

Abstract

The invention relates to the technical fields of land reclamation, ecological reconstruction and soil and water conservation and discloses a vegetation recovery method for a soil discharging field inan acidic mining area. The method includes the following steps of S1, adjusting the pH of soil, wherein a neutralizing agent is applied to topsoil of the acidic waste soil of the soil discharging field, the pH of the soil is less than 4, uniform stirring is conducted until the pH of the soil is 5.0-7.5, and the thickness of the topsoil is greater than 25 cm; S2, applying a nutrient supplement agent, wherein nitrogen fertilizer and phosphate fertilizer are applied to the topsoil in step S1 and stirred uniformly; S3, applying an organic material, wherein the organic material is applied to the topsoil and stirred uniformly after step S2 is completed to obtain improved soil with the soil conductivity of 2.5 ms cm<1> or below, and the organic material is plant straw powder or livestock manure;S4, planting pioneer plants on a soil improved layer in S3, wherein the pioneer plants can grow normally on the improved soil. By adopting an improvement method of cooperatively applying limestone powder, the organic material and the inorganic fertilizer, the cost is low, and the improvement effect is good.

Description

technical field [0001] The invention relates to the technical fields of land reclamation, ecological reconstruction and soil and water conservation, in particular to a method for restoring vegetation in acid mining area dumps. Background technique [0002] According to statistics, every 1 ton of ore mined in my country's mines will produce 0.52 tons of tailings, 0.04 tons of smelting waste residue and 0.42 tons of waste rock, of which only 0.02 tons are usable. Mining waste is one of the key factors of environmental pollution in mining areas. The discarded soil stripped during mining is piled up in the dump, often due to the mixing of tailings and waste rocks during the mining process, it becomes the source of water and soil erosion in the mining area and excessive heavy metals in the downstream river section. Vegetation restoration is the most fundamental way to completely solve such problems. However, in the acid mining area, a large amount of acid is produced after the s...

AI Technical Summary

Problems solved by technology

Therefore, soil improvement in acidic mining areas needs to eliminate the above limiting factors at the same time, which is difficult

[0004] The soil improvement method in the process of vegetation restoration in the existing acid mine dumps is the highest success rate of the foreign soil method. Although the improvement effect is good, it requires a large amount of foreign soil sources and a large amount of engineering. Most mining areas are located in mountainous areas. Insufficient and poor transportation conditions, so the guest soil method is not suitable for soil improvement of most mine dumps

The in-situ improvement method is a method that has been continuously explored and optimized in vegetation restoration projects in mining areas. It has the advantages of small engineering volume, low investment, and quick implementation. However, the soil properties of mine dumps vary greatly in time and space, so the soil improvement method that only gives the specific amount of amendments has a very large limitation in use, and there is no great limitation. Promote application value

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