不同耕作和轮作下潮棕壤微生物生物量及周转特征

Characteristics of turnover and soil microbial biomass in meadow brown soil under different rotation and tillage systems

通过对下辽河平原不同耕作和轮作措施下潮棕壤微生物生物量C、N及周转进行研究,结果表明,土壤微生物生物量C、N的变化趋势表现为,表层(0cm^5cm)高于下2层;在免耕实施6年后表层土壤微生物生物量C平均比常规耕作高12.4%;在相对比较干旱的情况下,免耕土壤微生物更新比常规耕作快。图2,表2,参8。

The characteristics of turnover and soil microbial biomass in meadow brown soil were studied under different rotation and tillage systems at lower Liaohe river plain. The results showed that changes of soil microbial biomass C, N in top layer （0cm - 5cm） were higher than in low layers. The soil microbial biomass C in zero tillage treatments increased by 12.4% compared to those in conventional tillage in 0cm - 5cm depth layer after 6 years. Under condition of relative drought, the turnover of soil microbial biomass C in zero tillage treatments was faster than those in conventional tillage.