【摘要】 了解煤矿开采区土壤无机碳(SIC)的垂直分布状况，对区域土地复垦和生态恢复具有重要指导价值。本研究以陕北红柳林煤矿开采区和未采区典型植被(草本、灌木、草灌混合)下的土壤为研究对象，通过分析0～200 cm不同土层SIC、可溶性无机碳(DIC)及土壤理化性质，揭示SIC的垂直分布特征及其影响因素。结果表明：(1)SIC含量随土层深度增加呈波动性下降趋势。未采区不同植被类型SIC无显著差异，开采区表现为草灌混合区与草本样地均高于灌木林地。(2)开采区各处理SIC、DIC含量均显著高于未采区。开采区表现为：草灌混合区>草本样地>灌木林地；未采区则表现为：灌木林地>草灌混合区>草本样地。(3)开采区各处理0～200 cm土壤无机碳密度(SICD)显著高于未采区。未采区以沙蒿草地(WCH)最高，沙柳-羊草混合区(WCG-1)最低，但差异不显著；而在开采区沙柳-羊草混合区(KCG-1)显著高于其他各处理。(4)SIC与土壤含水量、有机碳、电导率整体呈正相关关系，与pH值负相关。因此，为提升陕北煤矿区土壤无机碳库，未采区宜优先恢复草本植被(如沙蒿),开采区则推荐草灌混合植被(如沙柳与羊草)。更多还原

【Abstract】 Understanding the vertical distribution of soil inorganic carbon(SIC) in coal mining areas has important guiding value for regional land reclamation and ecological restoration. In this study, the soil under typical vegetation(herb, shrub, grass-shrub) in the mined and unmined areas of Hongliulin Coal Mine in northern Shaanxi was taken as the research object. By analyzing SIC, dissolved inorganic carbon(DIC) and soil physical and chemical properties in different soil layers from 0～200 cm, the vertical distribution characteristics and influencing factors of SIC under different vegetation types were revealed. The results show that(1) SIC content shows a fluctuating decreasing trend with the increase of soil depth. There is no significant difference in SIC among different vegetation types in the unmined areas, whereas in the mined areas, grass-shrub mixed areas and herbaceous plots show higher SIC than shrubland.(2) SIC and DIC contents in all treatments in the mined area are significantly higher than those in the unmined area. In the mined area, the order is: grass-shrub mixed area>herbaceous plot>shrubland; in the unmined area, the order is: shrubland>grass-shrub mixed area>herbaceous plot.(3)The soil inorganic carbon density(SICD) in the 0～200 cm soil layer is significantly higher in the mined area than in the unmined area. In the unmined area, Artemisia desertorum grassland(WCH) has the highest SICD, while Salix psammophila-Leymus secalinus mixed area(WCG-1) has the lowest, though the difference is not significant. In the mined area, Salix psammophila-Leymus secalinus mixed area(KCG-1) is significantly higher than other treatments.(4)SIC is generally positively correlated with soil water content, organic carbon, and electrical conductivity, but negatively correlated with pH. Therefore, to enhance the soil inorganic carbon pool in the coal mining area of northern Shaanxi, herbaceous vegetation(e.g., Artemisia desertorum) should be prioritized for restoration in unmined areas, while grass-shrub mixed vegetation(e.g., Salix psammophila and Leymus secalinus) is recommended for mined areas.更多还原