煤矿区采煤沉陷坡土壤有机碳变化特征探究

Study on the Characteristics of Soil Organic Carbon Changes in Coal Mining Subsidence Slopes in Coal Mining Areas

为了探究采煤沉陷对土壤有机碳含量的影响,分析了煤矿区沉陷坡坡顶、坡中、坡底和对照区农田土壤总有机碳(TOC)含量的差异和沉陷坡不同坡位、不同深度土壤有机碳含量的变化特征。结果表明:沉陷坡土壤有机碳含量均值相较于对照区农田明显降低了17%(P<0.05),沉陷坡土壤有机碳含量总体空间变异性更大。沉陷坡不同坡位和对照区土壤剖面土壤有机碳含量总体上随着土壤深度增加而呈现逐渐减少的趋势。沉陷坡不同坡位间土壤有机碳含量均值变化总体为坡顶最低、坡中最高、坡底最低。煤矿区沉陷坡土壤有机碳含量空间变化与由地表塌陷导致的土壤侵蚀现象有关,土壤侵蚀对不同位置、不同深度的土壤有机碳流失的影响程度不同。

In order to explore the impact of coal mining subsidence on soil organic carbon content,this paper analyzed the differences in soil Total Organic Carbon(TOC)content at the top,middle,bottom of the subsidence slope and farmland in the control area of the coal mining area,and the variation characteristics of soil organic carbon content at different slope positions and depths of the subsidence slope.The results showed that the mean value of soil organic carbon content in the subsidence slope was significantly lower than that in the farmland in the control area by 17%(P<0.05),and the overall spatial variability of soil organic carbon content in the subsidence slope was greater.The soil organic carbon content of soil profiles at different slope positions of the subsidence slope and the control area generally showed a gradual decrease trend with increasing soil depth.The mean change of soil organic carbon content between different slope positions of the subsidence slope was generally the lowest at the top,the highest in the middle,and the lowest at the bottom.The spatial variation of soil organic carbon content in the subsidence slope of the coal mining area is related to the soil erosion caused by surface collapse,and soil erosion has different effects on the loss of soil organic carbon at different positions and depths.