水稻土对有机、无机磷吸附-解吸的特征  

The characteristic on adsorption-desorption of organic and inorganic phosphorus in paddy soils

作　　者：贾学萍[1,2,3] 刘勤[1] 张焕朝[3] 袁嫚嫚[1] 朱强根[3] 

机构地区：[1]中国科学院南京土壤研究所,江苏南京210008 [2]安徽省滁州市土肥站,安徽滁州239001 [3]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《南京林业大学学报（自然科学版）》2010年第2期129-132,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：中国科学院知识创新工程重要方向项目(KSCXZ-YW-N-037);"十一五"国家科技支撑计划(2006BAD05B08);中国科学院知识创新工程项目(KZCX3-SW-435)

摘　　要：选用3种典型水稻土,在室内模拟研究了不同水稻土对无机磷和有机磷的吸附、解吸特征。结果表明,对磷酸二氢钾和磷酸肌醇的吸附方面,3种土壤吸附能力从大到小依次为:红田土、黄泥土、潮沙土,并且对不同存在形式磷的吸附大小均为有机磷大于无机磷。Langmuir方程、Fre-undlich方程和Temkin方程均能较好地拟合对无机磷和有机磷的吸附,且均达到显著相关。比较不同土壤的3种模拟参数,对于无机磷的吸附表征,Langmuir方程拟合较好,而对有机磷吸附的表征,Temkin方程拟合较好。3种水稻土对有机磷和无机磷的解吸量与吸附量均呈明显的指数相关关系,3种土壤解吸量从大到小依次为:潮沙土、黄泥土、红田土。磷的吸附随着离子强度的增加而增加。The adsorption and desorption of organic and inorganic phosphorus in the three types of paddy soils were studied in the lab experiments. The results showed that the maximum adsorption capacity both to monopotassium phosphate and inositol hexaphosphate from big to small were： red loam soil, stagnic anthrosols, loamy sand soil, and adsorption capacity of organic phosphorus was larger than that of inorganic phosphorus. The adsorption of organic and inorganic phosphorus could be fitted well by equations of Langmuir, Freundlich and Temkin. The Langmuir equation was the best for the fit of inorganic phosphorus adsorption. The Temkin equation was the best for the fit of organic phosphorus adsorption. The desorption of organic and inorganic phosphorus correlate exponentially with the adsorpted phosphorus. The desorbed phosphorus from big to small was loamy sand soil, stagnic anthrosols, red loam soil. The adsorption was affected by the ionic strength of the sorption solutions.

关 键 词：有机磷 无机磷 吸附 解吸 离子强度 水稻土 

分 类 号：S714[农业科学—林学]