Research Of Soil Restoration Effect Of Mine Subsided Area In Quanda’S Resource Depletion Mining

Huainan coal as the main base in chain, large resources mining area is located in the east of huainan city, the study area for mining and has set up a scrap of more than30years before the founding of the old mining area, covers an area of22.2square kilometers, the area3of discarded mine (laolongyan area, Datong area,Jiulonggang area) to form an area of6.6square kilometers mining subsidence area, abandoned quarry and pool area of0.6square kilometers, accounting for the entire Quanda resource depletion32.4%of the mining area.In order to explore the three characteristics of soil under different repair time limit,using grid points, obtained the three soil samples and soil samples in the study area surrounding sedimentary water sample and typical plants, analyzing the nutrient status, the total amount of heavy metals. Results show that the soil nutrient status for Lanlongyan> Jiulonggang> Datong, the wetland reclamation areas of collapse in Datong o, strong alkaline soil reach10.103, the highest soil available p about point Dl is digging holes as low as1.002mg/kg, alkali solution nitrogen17.500mg/kg for the determination of the lowest level in the samples. Can be seen from the monitoring results of soil heavy metal total condition for Jiulonggang> Datong> Lanlongyan, Cd is one of the most important heavy metal pollutants including Cr. Pb and Hg, in addition to the study of Jiulonggang area are not overweight, heavy metal content of Datong is slightly lower than Lanlongyan. long repair time of Lanlongyan plant species in the study area is:the trees there are24species, shrub with16species,52species of herbaceous plants, repair time limit short Datong plant species in the study area is:the trees there are21species,10shrubs,15species of herbaceous plants, Lanlongyan study area except the metasequoia sulfur content in the rest of the plant is less, Datong of sulfur content in plant inside area of wetland research gradually rise, the sulfur content in poplar Canada reached0.267%, especially in the study area of Jiulonggang, sulfur higher than other two areas in the plant, which compose the number of sulfur content reached0.550%. Sedimentary water quality situation for Lanlongyan>Jiulonggang> Datong, including Hg in three studies all levels of the water quality in Jiulonggang and Lanlongyan water quality in the study area, on average, more than50times the left and right sides, and Datong water quality research district most beyond multiples in the average range, but the hole i and processing pool n DaTong is372and119times water quality beyond standard, lowest pit ground subsidence in DaTong the point of12and even beyond the6103times.In addition, investigate the soil environmental characteristics of filling reclamation soil with chemical waste and coal gangue,setting a soil sampling routes through3areas different in filling reclamation pattern.Two types of restoration filling from coal mine subsidence in Datong, in Huainan, China were collected for evaluation. Sample B was taken from an area with chemical waste filling, sample C was taken from an area with coal gangue filling, and sample A was from the control area with a plantation mixture. The physical and chemical properties were analyzed, including the occurrence of Cr, Cd, Cu, Pb, and Hg. The environmental effects of the soil restoration were assessed. First, the results for the relationship of the prevalence of Available P in the three samples showed that Available P in area A> area B> area C. The prevalence of Available N in area C> area A> area B. The content of heavy metals and exchangeable Na+of area B was higher than in other areas, and the ESP content, in particular, was up to22%greater. Second, high alkalinity of the filling soil was widespread, showing a serious lack of available N and P. The soil fertility relationships showed that area A> area C> area B. The levels of heavy metal pollution found in the soil showed that area A had slight levels, area B had moderate to high levels, and area C had different types of heavy metal pollution. The total content of Cr, Cd, Cu and Pb in the soil was, to different degrees, greater than that found in typical Huainan contextual values. Third, the effect of the soil restoration in subsidence sample C was superior to subsidence sample B, and the environmental problems of the soil in area B need to be addressed.Quanda resource depletion has been established and soil environmental quality assessment methods of mining area:z-score standardization, principal component analysis and clustering synthesis.Lanlongyan area soil nutrient F value between 0.05-3.86, Datong area soil nutrient F value between5.64-1.06, Jiulonggang area soil nutrient F value between1.14-4.17, together soil nutrient status of Lanlongyan> Jiulonggang> Datong, nutrients from soil, heavy metal pollution, sedimentary water quality, and vegetation survey results comprehensively, Lanlongyan repair effect is best, ecological environment problem of Datong and Jiulonggang area are badly in need of effectively solution.