白浆土-植物系统营养物质转化机制及其有效性研究 Ⅰ.^(32)P同位素示踪法对白浆土中P肥利用率  

Transformation mechanism and availability of nutrients in albic soil-plant system Ⅰ.Phosphorus utilization rate in albic soil: a tracing study

作　　者：李法云[1] 高子勤[1] 

机构地区：[1]中国科学院沈阳应用生态研究所

出　　处：《应用生态学报》1996年第2期174-178,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金资助项目。

摘　　要：利用３２Ｐ同位素示踪法对白浆土中Ｐ肥利用率进行了研究．结果表明，在岗地白浆土上，表层土壤表现出一定程度的供Ｐ不足现象，白浆层土壤有效Ｐ含量严重缺乏．表层土壤中当季Ｐ肥利用率的变幅范围为６．０９～１２．３５％，白浆层土壤Ｐ肥利用率为１３％左右．施用有机肥能明显提高白浆土ＯｌｓｅｎＰ的含量，加速土壤本身Ｐ的活化，各种有机物中，以猪粪对土壤潜在Ｐ的活化效果最好．将ＯｌｓｅｎＰ与Ｘ值、Ａ值比较，认为ＯｌｓｅｎＰ是评价白浆上Ｐ肥力简便易行的可靠指标．The tracing study with 32 P isotope shows that the supply of phosphorus in topsoil is insufficient and the amount of available phosphorus in Aw soil is fairly lack. The utilization rate of phosphorus fertilizer in topsoil ranges from 6. 09 to 12. 35% and that in Aw soil is 13% or so. Application of organic fertilizer can increase the content of Olsen P in albic soil and mobilize potential phosphorus. Fertilizing feces is the best way to mobilize the potential phosphorus in soil. Olsen P is the reliable index to evaluate the phosphorus fertility of albic soil.

关 键 词：^(32)P同位素示踪 白浆土 P肥利用率 

分 类 号：S154.4[农业科学—土壤学]