摘要
磷素是红壤地区农业生产的最重要的限制因素,因此红壤磷素形态与转化问题的研究,对红壤地区农业生产具有重要意义。用Hedley方法对不同施肥条件下红壤旱地土壤磷素形态进行了研究,结果表明:施磷肥能明显增加红壤各形态无机磷含量和大多数形态有机磷含量;红壤中,对植物最有效的树脂磷和碳酸氢钠磷含量很少,铁铝结合态磷和残留磷含量很多;对有效磷(Bray磷)贡献最大的磷素形态是碳酸氢钠无机磷、铁铝结合态无机磷和存在于土壤团聚体内表面的有机磷。这对于了解不同施肥条件对红壤旱地磷素有效性的影响、探索磷素消长规律、指导红壤旱地磷素管理等都有一定的理论和实践意义。
Phosphorus （P） is the limiting factor for agricultural production in red soil regions, so the study about P forms and transports can be meaningful to agricultural production in red soil regions. The forms and contents of phosphorus by upland red soils different in fertilization were studied with the P fractionation method proposed by Hedley. The results show： 1） All the inorganic P and most of the organic P are always lower in soil not fertilized with inorganic or organic phosphorus than in soil fertilized with phosphorus. 2） Resin-P and NaHCO3-P that can be utilized by plant easily are tiny, but P combined with ferric and aluminium and Residual-P are the greatest parts in upland red soil. So the P availability in red soil is low. 3）NaHCO3-Pi, Pi combined with ferric and aluminium, Po existed in soil aggregates are the most contributive forms to available P（ Bray-P）. In a word, these results guide us to research on P availability and transformation of phosphorus by upland red soils different in fertilization. And then, they can be theoretical and practical guidance for phosphorus managment in upland red soil.
出处
《土壤学报》
CAS
CSCD
北大核心
2006年第5期793-799,共7页
Acta Pedologica Sinica
基金
中国科学院知识创新项目(KZCX2-413
ISSASIP0201)部分资助
关键词
红壤旱地
不同施肥处理
磷素形态
磷素有效性
Upland red soil
Different fertilization treatment
Phosphorus forms
Availability of phosphorus
