????生物固氮是陆地生态系统重要的氮源。过去很多研究认为生物固氮速率受到氮添加的抑制，但是越来越多的研究发现氮输入对森林土壤微生物固氮的影响并不总是负面的，而富氮环境下微生物固氮的驱动机制仍然不清楚。研究表明，微生物固氮是典型的耗能反应，土壤活性有机碳可能是固氮菌潜在的能量来源，因此深入探索不同来源的碳输入如何影响氮添加对土壤微生物固氮的影响将有助于理解土壤固氮的驱动机理。

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