随着免耕年限延长，土壤微生物量碳、氮均呈逐渐降低的趋势，免耕10年以上土壤微生物量碳最低，微生物量氮在免耕7～8年时最低。

The microbial biomass C and N were lowest in no-tillage 10 and 7~8 years, respectively, and then decreased along with the the no-tillage years increasing.

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随着免耕年限延长，土壤微生物量碳、氮均呈逐渐降低的趋势，免耕10年以上土壤微生物量碳最低，微生物量氮在免耕7～8年时最低。

The microbial biomass C and N were lowest in no-tillage 10 and 7~8 years, respectively, and then decreased along with the the no-tillage years increasing.

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