Quality Evaluation Of Reclaimed Soil In Subsidence Area Of Huainan And Huaibei Mining Area

The problem of remediation of subsided land through land reclamation technology is not only the re-use of the destroyed land,but also greatly alleviates the contradiction of urban land use.Therefore,We need to pay close attention to the quality of land resources after the restoration measures.In this paper,The two-factor index method and the Nemero index method based on fuzzy mathematics were used to comprehensively evaluate the subsidence area of the huainan and huaibei mining area.The level of soil fertility and the degree of heavy metal pollution are reclaimed.Then,through the potential ecological hazard index method,the possible ecological hazards of the five pollution factors in the huainan and huaibei mining area will be analyzed.Taking Panji District as an example,the spatial distribution characteristics of soil fertility quality,heavy metal pollution degree and potential ecological risk degree were obtained through GIS technology analysis.The main results of the paper are as follows:(1)Soil fertility index ranged from 1.04 to 2.07 in the study area,and soil fertility quality index ranged from 1.67 to 1.87 in most areas,accounting for 71%of the total sample points,indicating that the overall quality of soil fertility inthe Huainan and Huaibei Mining Areas was above the middle level and had a larger development space.(2)The single factor index values of all heavy metals measured in the study area are all in the middle of 0～2,and thevalues are all less than 0.7.It can be seen that the pollution level of the reclaimed soil in the Huainan and Huaibei Mining Areas is relatively small,which basically conforms to the national soil environment level.Standards,only some areas with individual sample points have slight cadmium contamination.(3)The potential hazard risk of soil in the subsidence area of the Huainan and Huaibei Mining Areas is cadmium>mercury>arsenic>copper>nickel,so the two elements of mercury and cadmium pose a great threat to the environment of the mining area,and the local needs regular monitoring.It can be seen from RI that the slight degree of damage accounts for 73.39%,indicating that the risk of potential heavy metal pollution is small in most research areas.In general,the potential ecological risk of reclaimed soil in the subsidence area of the Huainan and Huaibei Mining Areasis mainly caused by cadmium and mercury,while other heavy metal elements have not brought potential ecological risks to the reclaimed soil.(4)In the Panji District,The highest level is in the Rongzhuang-Xiaxu area,and also exists in the Paner mining area in Yangji.The Panbei mining area has gradually increased its pollution level from Panyang-Zhuzhuang.The multi-factor potential hazard degree of five heavy metals in Panji District is the best in the vicinity of the Panbei mining area.Near the Panyi mining area,the potential hazard index from the Lixu-Daimiao gradually increases.The range of moderate hazard is mainly concentrated in Pan er.And Pan san,two of the long history of coal mining subsidence areas.The entire Panji District is mainly divided into mild damage degree and moderate hazard degree,and their respective area ratios are 99.77%and 0.23%,respectively.Figure[7]table[23]reference[57]...