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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 clarify the impact of reclamation on soil carbon and nitrogen content, taking the reclamation land of Majiatas open pit in Dongshen mining area of Shenfu as the research object, the contents of soil organic matter, total nitrogen, available nitrogen and carbon Nitrogen ratio changes, at the same time analyzed the correlation between organic matter and nitrogen. The results showed that: (1) The content of organic matter in surface layer (0-20cm) of reclamation area was significantly higher than that in the lower layer (20-40cm), and the distribution of organic matter was not balanced. Compared with undisturbed soil, the content of organic matter in reclaimed soil increased significantly and C / N ratio decreased. (2) The contents of total nitrogen and alkali-hydrolyzable nitrogen in reclaimed soil were significantly higher than those of undisturbed soil. The contents of available nitrogen in surface layer of reclaimed soil were significantly higher than those in the lower layer, indicating that the supply potential of nitrogen after reclamation increased. (3) Correlation analysis showed that there was a significant linear positive correlation between organic matter and total nitrogen, between organic matter and available nitrogen and between total nitrogen and basic nitrogen. The results of this study play an important role in assessing the reclamation effect and guiding the practice of reclamation.