风沙区采煤扰动下土壤养分含量的演变特征

为揭示超大工作面开采过程中采煤沉陷对土壤养分影响的演变特征,并为矿区生态自修复研究提供理论参考。选择大柳塔矿某综采工作面,分别对开采前、开采过程中、开采结束及地表稳定后这一煤炭开采全周期的对照区及沉陷区进行取样,对比分析土壤养分含量。结果表明:土壤pH值随开采进度呈增大趋势,地表稳定后逐渐降低;有机质、速效磷及全氮随开采程度呈先降后增的趋势;速效钾一直呈增大的趋势,与有机质、全氮及速效磷变化趋势不一致。地表稳定后土壤养分含量与对照区基本趋于一致,表明沉陷区土壤养分具有一定的自修复特征。

Evolution characteristics of soil nutrient contents due to coal mining in windy and sandy region

To reveal the evolution characteristics of impacts of mining subsidence on soil chemical properties induced by super-large working face, which would provide a scientific basis for ecological self-healing in mining area. Samples were taken from certain Daliuta working face, including pre-mining, mining, post-mining and surface stability in control area and mining area, respectively, and the data were analyzed for soil nutrient contents. The results show that: soil pH value increased with the extension of exploitation schedule and then gradually inclined in the period of surface stability; organic matter, available phosphorus and total nitrogen inclined first and then increased with the extension of exploitation degree; available potassium continuously increased which was different from other indexes. Soil nutrient contents were basically consistent with control area after surface stability, and it shows certain self-heal ability.