Relationship between soil microbial biomass P dynamics

1.建立了一种利用阴离子交换膜（AEM）测定高持磷土壤生物量磷的新方法，与传统的氯仿-熏蒸提取法（FE）相比，该方法更简便、准确、灵活，可用于高持磷土壤生物量磷的测定2.比较了不同管理方式下草地土壤微生物量C、N、P的变化，结果表明，免耕和有机肥沿着无机肥的草地土壤微生物量C、N、P含量较高，3.测定了添加葡萄糖和黑麦草后土壤微生物生物量的动态变化，结果表明，添加葡萄糖和黑麦草后，土壤微生物生物量磷的周转时间比生物量C快一倍以上，表现出明显的启动效应。4.分析了有机质施用对土壤生物量磷动态的影响，结果表明，土壤生物量磷和生物量C的变化与有机质施用量的变化呈显著正相关。施用有机质可提高土壤磷素的利用率，生物量磷有助于提高土壤磷素的有效性，提高有机质和化肥中磷素的利用率。

1.A new method to determine biomass P in soils of high P retention capacity by employing anion exchange membrane (AEM) was developed.Compared to the original chloroform-fumigation extraction (FE) method, the AEM method is simpler, more accurate, and more flexible, allowing assay of biomass P in soils of high P retention capacity (e.g.andosols).2.The soil microbial biomass C,N and P of grasslands under different managements were compared.The amount of biomass C,N and P were higher in no-tillage plots and in plots receiving organic manure along with inorganic fertilizer, and also affected crop species grown.3.Soil microbial biomass dynamics were measured following addition of glucose and ryegrass.A priming effect apparently occurred by glucose and ryegrass addition.The apparent turnover time of biomass P was more than twice as fast as that of biomass C.4.The effects of organic matter application on biomass P dynamics in andosols were analyzed.The amount of biomass P and the recovery of applied P were increased by the organic matter application.The biomass P contributes to the increase of P availability in soils and the recovery of P in organic matter and chemical fertilizer.