Relationship between soil microbial biomass P dynamics

1.建立了一种利用阴离子交换膜(AEM)测定高磷土壤生物量P的新方法。与原有的氯仿-熏蒸萃取法(FE)相比，AEM方法更简单、更准确、更灵活，可以测定高磷土壤(如红壤)中的生物量P。2.比较了不同管理方式下草地土壤微生物生物量C、N、P的变化。免耕和有机肥配施无机肥的草地土壤微生物量C、N、P含量较高。研究了添加葡萄糖和黑麦草对土壤微生物量动态的影响，结果表明，添加葡萄糖和黑麦草对土壤微生物量有明显的启动作用，生物量P的表观周转时间是生物量C4的2倍以上。分析了有机质施用量对红壤生物量P动态的影响，有机质提高了生物量P的用量和施磷量的利用率，提高了土壤P的有效性和有机质和化肥中P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.