矿区复垦地土壤碳氮含量变化特征

Variation of Soil Carbon and Nitrogen Contents in the Reclamation of Coal Mine Area

为阐明矿区复垦对土壤碳氮含量的影响,以神府东胜矿区马家塔露天矿区复垦地为研究对象,比较了复垦区与原状土壤有机质、全氮、碱解氮含量以及碳氮比变化,同时分析了有机质和氮之间的相关性。结果表明:(1)复垦区表层(0—20cm)土壤有机质含量显著高于下层(20—40cm),且有机质分布不均衡。和原状土壤相比,复垦地土壤的有机质含量显著增加,C/N比减小。(2)复垦土壤的全氮和碱解氮含量显著高于原状土壤,碱解氮含量表层显著高于下层,说明复垦后氮素的供应潜力提高。(3)相关分析表明,有机质和全氮之间、有机质与碱解氮之间以及全氮与碱解氮之间均存在显著的线性正相关关系。该研究结果对于评估复垦效应,指导复垦的实践具有重要作用。

In order to address the effect of reclamation on soil organic carbon and nitrogen contents, the variation of organic matter, total nitrogen, available nitrogen and the ratios of C/N in soil at Shengfudongsheng reclamation of coal mine area were trogen was analyzed. The results s than that in 0-20 cm layer, indica investigated. Furthermore, the correlation between organic matter and ni howed that. （1） soil organic matter content in 20 40 cm layer was lower ting that the distribution of soil organic matter was not balanced. Soil organic matter content in reclamation area significantly increased and C/N decreased compared to the original soil, which was of great benefit to the accumulation of available nitrogen; （2） total nitrogen and available nitrogen in reclamation area were significantly higher than that of none reclaimed soil. Soil available nitrogen in 20-40 cm layer was significantly lower than that of 0-20 cm soil layer in reclamation area. Potential of ni trogen supplying was greatly improved after reclamation; （3） a significantly positive linear correlation was observed among soil organic matter, total nitrogen content and available nitrogen content. Overall, the research provides a basic information for the evaluation of reclamation and instruction to the reclaimation.