草业学报2017，Vol.26Issue(11)：22-34,13.DOI:10.11686/cyxb2017069
自然粒度酸化紫色土磷形态分级及其流失解析度评价
Phosphorus fractionation and losses in an acidified purple soil
摘要
Abstract
Phosphorus (P) fractionation was developed to quantitatively analyze P fraction transformation and P loss apportionment.In order to investigate the effect of P fertilization on P fractions and apportionment of P loss forms,a plot experiment with three P levels (0,60 and 120 kg P2O5/ha) was conducted in a mustard crop grown on an acidified purple soil.Phosphorus fractions and P loss apportionment were analyzed using a new P fractionation method which is much less variable than the Hedley fractionation method and better at characterizing the P loss index.The P loss index was positively correlated with P fertilization and the main P loss source was soluble P in NH4F and NaOH.Increasing P fertilization significantly increased the free P,resin available P,Ca2-P and Ca8-P,while zero P application significantly decreased the Ca2-P,Ca8-P and iron or aluminum bound P.In conclusion,the new P fractionation method was a viable and better method for characterizing the quantitative assessment of P loss in non-point source pollution.The study also showed that soil P loss was mainly of soluble P and that P fertilization greatly influenced the transformation of P fractions in a labile and chronic phosphorus pool.关键词
磷形态分级/自然粒度/酸化紫色土/磷流失指数/磷流失解析度Key words
phosphorus fractionation/natural grain size/acidified purple soils/phosphorus loss index/phosphorus loss apportionment引用本文复制引用
张洋,雷平,谢德体,倪九派..自然粒度酸化紫色土磷形态分级及其流失解析度评价[J].草业学报,2017,26(11):22-34,13.基金项目
国家自然科学基金项目(41671291),中央高校基本科研业务费项目(XDJ2016E161)和重庆市研究生科研创新项目(CYB2015054)资助. （41671291）
