Effects of Phosphate Adsorption on Adsorption-Desorption and Availability of Cu and Zn Ions in Ultisols and Alfisols  

作　　者：LIXUEYUAN DONGYUANYAN 等 

机构地区：[1]KeyLaboratoryofSubtropicalSoilResourcesandEnvironment,ChineseMinistryofAgriculture,HuazhongAgriculturalUniversity,Wuhan430070,China [2]KeyLaboratoryofSubtropicalSoilResourcesandEnvironment,ChineseMinistr

出　　处：《Pedosphere》2000年第4期355-362,共8页土壤圈（英文版）

基　　金：Project (No. 49871043) supported by the National Natural Science Foundation of China.

摘　　要：Surface charge, secondary adsorption- desorption and form distribution of Cu2+ and Zn2+ in Ultisols and Alfisols having adsorbed phosphate were studied by potentiometric titration, adsorption equilibrium and sequential extraction method, respectively. The soil surface negative charges increased whereas the amount of positive charges decreased with increase of P adsorbed. The soil secondary adsorption capacity for Cu2+ and Zn2+ was positively significantly correlated with the amount of P adsorbed by the soils, which could be described by the Langmuir equation. The amounts of Cu2+ and Zn2+ desorption from soils were decreased after P adsorption by the soils and the relationship between them was linear. After the soils adsorbed P, form distribution of Cu2+ and Zn2+ in soils changed remarforbly.Surface charge, secondary adsorption- desorption and form distribution of Cu2+ and Zn2+ in Ultisols and Alfisols having adsorbed phosphate were studied by potentiometric titration, adsorption equilibrium and sequential extraction method, respectively. The soil surface negative charges increased whereas the amount of positive charges decreased with increase of P adsorbed. The soil secondary adsorption capacity for Cu2+ and Zn2+ was positively significantly correlated with the amount of P adsorbed by the soils, which could be described by the Langmuir equation. The amounts of Cu2+ and Zn2+ desorption from soils were decreased after P adsorption by the soils and the relationship between them was linear. After the soils adsorbed P, form distribution of Cu2+ and Zn2+ in soils changed remarforbly.

关 键 词：ADSORPTION-DESORPTION Alfisol and Ultisol availability Cu2+ and Zn2+ phosphate adsorption 

分 类 号：S153.6[农业科学—土壤学]