Identification of soil organic carbon components and hyperspectral sensitivity in microbial reclamation area

Microbial reclamation technology is one of the important means of environmental management in mining areas,and it is of great significance for improving the ecological environment of mining areas.Microbial restoration in mining areas is a continuous ecological evolution process.The ecological effect is an urgent problem to be solved.In order to prove the ecological effect of arbuscular mycorrhizal fungi (AMF) inoculation on soil improvement in coal mining subsidence areas after many years of reclamation,scientifically evaluate the important role of microbial reclamation technology in the environmental restoration of mining areas,the cultivated area of Amorpha fruticosa was planted at the research area in 2012.The basic physical and chemical properties,soil active organic carbon,hyperspectral characteristics of the soil and the control area under two different treatments were analyzed.The results of the study showed that the soil texture changed significantly after 7 years of inoculation with AM fungi.Total nitrogen,available phosphorus and organic carbon in the soil were significantly increased by 48.3%,17.7% and 31.2%,respectively,increasing the soil moisture content.Different treatment areas showed some differences.Soil urease and phosphatase in the inoculated area were higher than the control area,which were significantly increased by 28.6% and 50.0%,respectively.The spectral reflectance of the soil was significantly reduced.The most obvious change was the visible light 655 nm band,and the sensitive band was 630-680 nm.The decrease of soil spectral reflectance was mainly affected by soil organic carbon.The microbial biomass carbon in the soil carbon component was highly correlated with organic carbon and soil physical and chemical indicators,and the fitting degree R2 was higher than 0.7,the significance test probability P was far below 0.01,reaching a significant level,and could be used as an indicator to analyze the spectral characteristics.After microbial reclamation,the ecological effects have been continuously improved.