Abstract
The dump site formed by the large-scale open-pit coal mining waste piles has poor soil environment and difficult vegetation restoration, and is in the grassland area with relatively weak ecological environment. A completely randomized block design was used to conduct separate application of microbial fertilizer and the combined application of microbial fertilizer and organic fertilizer in this study. The results showed that “Sino Green Agri-Biotech” soil conditioner combined with organic fertilizer had a higher plant biomass by comparing different fertilization methods, the plant biomass increased with the increase of microbial fertilizer application. The RSR (Rank Sum Ratio) method was used to analyze the comprehensive benefits of different fertilization methods from the aspects of microbial community diversity, soil enzyme activity, soil fertility, vegetation growth status and economic benefits. Evaluation results showed that application of microbial fertilizer had an important role in increasing soil fertility and accelerating vegetation construction the combined benefit of E-2001 microbial fertilizer application rate of 0.60 ml/m2 and organic fertilizer was the highest, priority can be given to the process of ecological restoration on coal mine dump in grassland. It is preferred to use a combination of E-2001 microbial fertilizer application rate of 0.60 ml/m2 and organic fertilizer in the soil improvement process of vegetation restoration and reconstruction in the grassland mining area.
Highlights
Inner Mongolia has become one of the most important energy bases in China because of its abundance of coal
The average biomass reached 161.53 g/m2, the plant biomass treated by E3F3 reached 220.45 g/m2, and the aboveground biomass of the non-fertilized control plot had 84.64 g/m2
The results showed that the combined benefit of E-2001 microbial fertilizer application rate of 0.60 ml/m2 and organic fertilizer was the highest, followed by the combination of "Sino Green Agri-Biotech" soil conditioner application rate of 6 g/m2 and organic fertilizer, and the comprehensive benefit of organic fertilizer alone lowest
Summary
Inner Mongolia has become one of the most important energy bases in China because of its abundance of coal. The waste land produced by open-pit mining is mainly coal mine dump on grassland[2]. A large number of waste soil and residue are piled up in the coal mine dump, and the original mechanical composition and structure of the soil are changed. These characteristics of the coal mine dump severely restrict the ecological restoration and vegetation reconstruction of the grassland mining area, such as poor soil, low water content, and low biological activity[3,4]. Soil microorganisms are an important part of the ecosystem and the most active part of the soil ecosystem. The use of modern microbial technologies such as autogenous nitrogen-fixing bacteria, phosphorus bacteria, potassium
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