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在野外调查基础上,对皇甫川流域五分地沟试验区油松林、锦鸡儿灌丛、本氏针茅草原、百里香草原和撂荒地的土壤有机质和养分进行测定及分析,结果表明:(1)植被恢复能显著提高土壤中有机质含量水平,增加速效养分的数量,改善土壤肥力状况;(2)土壤肥力的提高效益大多随深度增加而明显减小,其中油松林的土壤有机质的表聚性最为明显;(3)人工植被相对于天然植被对总氮的固定作用更为明显,而对总磷的固定作用劣于天然植被。最后,对植被恢复提高土壤肥力的机理和不同植被对土壤肥力的恢复效应进行了探讨。
Based on the field investigation, the soil organic matter and nutrients of Pinus tabulaeformis, Caragana korshinskii, Stipa bungeana, stephens steppe and abandoned land in the Fenghuang pilot area of Huangfuchuan catchment were measured and analyzed. The results showed that: (1) Vegetation restoration can significantly increase the content of organic matter in soil, increase the amount of available nutrients, and improve soil fertility. (2) The improvement of soil fertility mostly decreases with the increase of soil depth. The content of soil organic matter in Pinus tabulaeformis forest is the most Obvious; (3) Artificial vegetation relative to natural vegetation fixation of total nitrogen is more obvious, while the total phosphorus fixation is inferior to natural vegetation. Finally, the mechanism of vegetation restoration to improve soil fertility and the restoration effect of different vegetation on soil fertility were discussed.