^(32)P示踪法研究溶磷真菌对磷肥转化固定和有效性的影响  

Effects of phosphate-dissolving fungi on transformation,fixation and efficiency of fertilizer 32 P.

作　　者：范丙全[1] 金继运[1] 葛诚[1] 

机构地区：[1]中国农业科学院土壤肥料研究所,北京100081

出　　处：《应用生态学报》2004年第11期2142-2146,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金资助项目 (3 0 2 70 0 48)

摘　　要：采用3 2 P示踪技术 ,研究了溶磷青霉菌P8对肥料磷与土壤有效磷的转化、固定和有效性的影响 .结果表明 ,溶磷青霉菌菌剂能够增加玉米、花生的生物量 ,促进作物对土壤和肥料磷素的吸收 ;溶磷菌剂具有防止有效磷转化为难溶Ca10 P的作用 ,增加有效态磷 (Ca2 3 2 P、Ca8 3 2 P)的比例 .随时间延长 ,施入的3 2 P转化为Ca10 P的数量 (或比例 )逐渐增加 ,但是相对于未接种菌剂处理 ,接种青霉菌菌剂的土壤磷和肥料磷转化为Ca10 P比例最低 .溶磷青霉菌菌剂不仅能够防止有效磷向难溶磷Ca10 P的转化 ,而且其效果能够维持较长时间 .By using a radioactive 32 P-labeled technique,this paper studied the effects of P-dissolving Penicillium oxalicum P8 inoculum on the transformation,fixation and efficiency of fertilizer P.The results showed that the inoculum could prevent available P from fixation by soil,and promoted the uptake of applied P by maize and peanut.Additionally,it reduced the amount of Ca 10 -P fraction derived from available P,increased the pool of available P,and maintained more 32 P in forms of Ca 2-P and Ca 8-P.With time extending,the ratio of Ca 10 -P fraction in soil was gradually increased,and the treatment with P.oxalicum P8 showed the lowest ratio of Ca10-P form,compared with treatment without P.oxalicum P8.The inoculum not only prevented available 32 P from turning into Ca 10 -P form,but also had a longer effective period.

关 键 词：^32p示踪技术 溶磷真菌 磷肥 有效性 

分 类 号：S143.2[农业科学—肥料学]