基于Meta分析的煤矿区土壤有机碳储量对外源养分输入的响应机制研究OA

Coal mining severely damages surface vegetation and causes land degradation.Al-though reclamation measures can help restore the basic soil fertility,it is necessary to apply exogenous nutrients(such as various soil amendments or fertilizers)to comprehensively im-prove soil quality.In this study,Meta-analysis was used to integrate field experimental da-ta to reveal the laws governing the effects of exogenous nutrient input on soil organic carbon(SOC)and related soil physical and chemical properties in coal mining areas.The results showed that mixed fertilizer(mixed application of two or more fertilizers)had the best im-provement effect,followed by organic fertilizer and chemical fertilizer,and the effect of or-ganic fertilizer on increasing soil nutrient content and reducing soil alkalinity was weaker than that of chemical fertilizer.The intercropping pattern had the best effect on improving soil nutrients,and the combination of mixed fertilizer and herbaceous plants could signifi-cantly increase SOC storage;the application of organic fertilizer,chemical fertilizer,and mixed fertilizer in corn fields could all effectively improve soil nutrients.With the long-term application of organic fertilizer,the increase in soil nutrients gradually enhanced,while the nutrient-improving effects of chemical fertilizer and mixed fertilizer showed a weake-ning trend with the extension of application years.In addition,although high-rate fertiliza-tion can increase SOC storage and reduce soil alkalinity,it will reduce nutrient use efficiency and pose risks of nutrient waste and secondary pollution.Ecological restoration in mining ar-eas is a complex systematic project.In practice,comprehensive consideration should be giv-en to fertilizer type,fertilization rate,planting pattern,and ecological safety to achieve the long-term stable restoration of soil fertility and ecological functions in mining areas.