土壤微生物生物量碳(简称土壤微生物量碳)是指土壤中体积<5000μm 3活的和死的微生物体内碳的总和。土壤微生物生物量碳在土壤碳库中所占比例很小,一般只占土壤有机碳全量的1%～ 4%,但对土壤有效养分而言,却是一个很大的给源和库存。
土壤有效铅与土壤微生物生物量碳及土壤脲酶呈显著负相关。
Correlation analysis indicated that there were significantly negative correlations between soil biomass carbon and urease activity with available lead content in the soil.
茶树根层土壤微生物生物量碳随树龄增长而增加，但与茶树根层土壤可培养微生物总量无显著相关。
Soil microbial biomass carbon in the tea plant root layer increased significantly with the age of tea plants.
施用铜制剂还显著影响了土壤的生物学指标，表现为土壤基础呼吸和代谢熵升高，微生物生物量碳降低。
Moreover, the biological indexes of soil were affected, basal respiration and metabolic quotients were increased, microbial carbon was declined.
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