采煤沉陷积水区沉积物总碳和有机碳分布特征——以XT矿区为例

Distribution Characteristics of Total Carbon and Organic Carbon in Sediments of Coal Mining Subsidence―Taking the XT Coal Mine as a Case Study

地下采煤活动极易诱发地表沉陷,地表径流汇聚形成塌陷湖泊,影响矿区土壤中总碳(TC)及总有机碳(TOC)的含量和分布。通过测定土壤理化性质、总碳、总有机碳含量来对比不同水域(浅水区、深水区)差异性,基于反距离权重插值查看两种碳组分空间分布。结果表明:沉陷区底泥0~5 cm的容重存在显著性差异,深水区和浅水区之间的含水率、pH值及电导率之间不存在显著性差异(P<0.05)。TC和TOC在沉陷积水区不存在显著差异,浅水区不同沉积物层TC含量存在显著性差异,而深水区不同沉积物层TC含量不存在显著性差异(P<0.05)。0~5 cm沉积物的TOC含量最高,其含量范围为(10.59±3.03)~(11.67±4.02)g/kg。基于反距离权重插值图可知,TC和TOC的含量随深度增加呈正相关关系。TC含量在近岸侧高,而TOC含量在湖泊底部凹陷处较高。

Coal mining activities can easily induce surface subsidence,and surface runoff converges to form subsidence lakes,which affects the content and distribution of Total Carbon(TC)and Total Organic Carbon(TOC)in the soil of the mining area.This paper compares the differences in different waters(shallow water areas and deep water areas)by measuring soil physical and chemical properties,total carbon,and total organic carbon content,and examines the spatial distribution of the two carbon components based on inverse distance weight interpolation.The results show that there is a significant difference in the bulk density of 0~5 cm sediment in the subsidence area,and there is no significant difference in the moisture content,pH and conductivity between the deep-water area and the shallow water area(P<0.05).There is no significant difference between TC and TOC in the subsidence water area.There is a significant difference in the TC content of different sediment layers in the shallow water area,but there is no significant difference in the TC content of different sediment layers in the deep-water area(P<0.05).The 0~5 cm sediment has the highest TOC content,with the content ranging from 10.59±3.03 to 11.67±4.02 g/kg.Based on the inverse distance weighted interpolation diagram,it can be seen that the contents of TC and TOC have a positive correlation with depth.The TC content is high on the nearshore side,while the TOC content is higher in the depression at the bottom of the lake.