低碳条件下土壤微生物量磷对加入无机磷的响应  

Response of soil microbial biomass P to addition of different quantities of inorganic P with low soil organic C content

作　　者：来璐[1] 赵小蓉[1] 李贵桐[1] 林启美[1] 

机构地区：[1]中国农业大学资源与环境学院,北京100094

出　　处：《生态环境》2007年第3期1014-1017,共4页Ecology and Environmnet

基　　金：国家自然科学基金项目(40301023)

摘　　要：土壤微生物量磷是土壤有效磷的“源”和“库”,其变化幅度很大,受多种因素影响。采用室内培养的方法,向土壤中加入不同量KH2PO4,分析在土壤有机碳供应不充足条件下土壤微生物量磷对外加无机磷的响应,探讨影响土壤微生物量磷的因素,为提高土壤磷素有效性提供理论依据。结果表明,在土壤有机碳供应不充足的条件下,加入的无机磷对土壤微生物量碳无明显影响,但可显著增加土壤微生物量磷和微生物含磷量,随着无机磷加入量的增加,土壤微生物量磷和微生物含磷量增加幅度增加。土壤微生物量磷及微生物含磷量与土壤有效磷之间成显著直线相关,土壤有效磷每提高1个单位,土壤微生物量磷增加0.22个单位,土壤微生物含磷量增加0.73个单位。Soil microbial biomass P is considered as the ＂sources＂ and ＂sink＂ for soil available P. It changes widely and is influenced by many factors. Laboratory incubation was conducted to evaluate the influence of inorganic P on soil microbial biomass P with low soil organic C content. The results showed that soil microbial biomass P and P concentration in biomass increased with the amount of added P under the condition of insufficient C, while soil microbial biomass C did no change significantly with the addition of phosphates. Relationship analysis results indicated that there was significant linear relationship between soil microbial biomass P and soil available P. Similar relationship was found between P concentration in biomass and soil available P. Soil microbial biomass P and P concentration in biomass increased 0.22 mg·kg^-1 and 0.73 mg·g^-1 respectively with increased 1 mg·kg^-1 soil available P.

关 键 词：低碳 微生物量磷 无机磷 

分 类 号：S154.34[农业科学—土壤学]