Spatial Distribution Characteristics of Dissolved Organic Carbon in Reconstructed Soil in Coal Mine Reclamation Area
In order to analyze the spatial distribution characteristics of dissolved organic carbon(DOC) in reconstructed soil in coal mine reclamation area, this study selected a coal gangue pile and peripheral reclaimed forestry soil in Panyi Coal Mine in Huainan as the study object, the contents of DOC in gangue weathering matters located at the peak, slope and foot of the gangue pile and in reclaimed forestry soil and in their different size particles were measured. The results showed that DOC contents in gangue weathering matters decreased from the peak to foot of gangue pile but increased with the increase of profile depth at the same site, while DOC content in forestry soil reduced with the increase of profile depth. DOC contents were different in different size particles, fine sand part (0.2-0.05 mm) had the highest DOC content while gravel part (10-2 mm) had the smallest DOC content. Under the leaching of rainwater, gangue weathering matter contributed significantly to DOC content in peripheral soil, within the range of 1-100 m, with the increase of the distance from the foot of gangue pile, DOC content in soil decreased from 325.46 mg/kg to 177.89 mg/kg, the contribution rate of gangue weathering matter to soil DOC content decreased from 85.78% to 1.54%, and DOC content in soil at 100 m far was near the normal level of CK soil.
国家科技期刊平台
NSTL
万方数据
维普
