采煤塌陷区土壤碳储量变化及其影响因素分析

采用因子分析、相关分析等方法揭示大柳塔矿区采煤塌陷前后土壤碳储量的变化及其影响因素。结果表明:（1）在不同土层深度上，土壤碳储量含量差异不显著（p < 0.05），但在空间分布上差异显著。（2）在不同坡位上，对照区和沉陷区均表现出坡底 > 坡中 > 坡顶的规律，采煤塌陷对坡底部位的土壤碳储量影响差异显著（p < 0.05）。（3）土壤碳储量与土壤孔隙度、全氮、有机质均呈显著正相关，相关系数分别为0.943，0.864，0.967（p < 0.01），并且，主导影响因子为土壤有机质和土壤孔隙度。

Effects of Mining Subsidence on Soil Carbon Storage in the Semi-arid Area

Variance analysis and factor analysis were used to reveal effects of mining subsidence on soil carbon storage in Daliuta mining area. The results showed that: (1) at different soil depths, soil carbon storages had no significant difference (p < 0.05), but significantly different in spatial distribution; (2) at different slope positions, both in control area and subsidence area, carbon storages showed the same pattern: slope bottom > slope middle > slope top, mining subsidence had the great impact on soil carbon storage of slope bottom according to variance analysis(p < 0.05); (3) in coal mining subsidence, soil carbon storage was positively related to soil porosity, total nitrogen, and soil organic matter, respectively, with the correlation coefficients: 0.943, 0.864 and 0.967 (p < 0.01), and the dominant factors were soil organic matter and soil porosity.