Abstract
Taking the mine dump in nonferrous metal mine as the research object in desert steppe Inner Mongolia, according to the artificial remodeling of the landforms and the characteristics of water and soil erosion, the vegetation restoration model tests on the dumping site were carried out. The ecological effects of four vegetation restoration measures on soil and water storage were analyzed which including shrubs, shrubgrass, grass and natural restoration of vegetation. The research results showed that compared with the natural restoration plant community, the soil surface water content of the three planting restoration measures increased obviously, the soil organic matter content increased but the change difference was not obvious. The vegetation coverage of shrub-grass was 67%, and the aboveground biomass was 132 g/m2. The vegetation restoration measure of shrub-grass had stronger wind-proof and soil-fixing ability than other measures, the vegetation coverage reaches 67% and the above-ground biomass is 132 g/m2. Efficacy evaluation was carried out by the grey correlation method, and Comprehensive benefit of shrubs, shrub-grass and grass all reached higher value. The most comprehensive benefit was the shrub-grass measure, which reached 0.68, and the smallest was shrubs measure also reached 0.60. Three measures cloud be applied to the vegetation restoration of desert steppe metal mining areas, and shrub-grass measure was the best.
Highlights
The desert steppe in Inner Mongolia was located in the northern sand prevention belt of the national ecological security pattern of "two screens and three belts"
3.1 Change of vegetation The plant community of the nonferrous metal mine dump had certain difference after implementing different vegetation restoration measures. the vegetation coverage of the natural restoration plot was only 12%, and a large area of the ground was exposed according to Table 2
4.2 The comprehensive benefit of shrub-grass measures was the highest, up to 0.68, and the soil and water conservation and ecological benefits were obvious through the grey relational degree method
Summary
The desert steppe in Inner Mongolia was located in the northern sand prevention belt of the national ecological security pattern of "two screens and three belts". It was the key construction area of the belt and road initiative area and was an important natural ecological barrier in China. With the increasing of the scale and intensity of mineral resources construction in desert steppe, the area of loose accumulation abandoned land formed by mining construction and production was increasing continuously. The ecological and environmental problems in desert steppe mining areas were becoming more and more serious, especially in nonferrous metal mine, and had adverse effects on the green mine construction
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