湖北省几种土壤的粘土矿物组成与表面化学性质

CLAY MINERALOGY AND SURFACE PROPERTIES OF HUBEI PROVINCE SOILS DERIVED FROM QUATERNARY PERIOD DEPOSIT

研究了湖北省棕红壤、黄棕壤、水稻土和灰潮土的粘土矿物组成、电荷性质及对磷的吸附。结果表明：①供试土壤的粘土矿物组成都以水云母为主，高岭石和１．４ｎｍ矿物含量较少，１．４ｎｍ矿物种类不同且比例变异大；②供试土壤的负电荷量（ＣＥＣ８．２）介于９．２～１９．１ｃｍｏｌ／ｋｇ间，永久负电荷占ＣＥＣ８．２的５０％～６４％，阴离子交换量（ＡＥＣ）为０．７５～２．２１ｃｍｏｌ／ｋｇ，电荷零点（ＰＺＣ）介于２．３～３．４；③供试土壤对磷的吸附量多符合Ｌａｎｇｍｕｉｒ方程，其高低顺序为棕红壤＞黄棕壤＞水稻土＞灰潮土。

Seven soils of Hubei Province were used to investigate the clay mineral constituents, charge properties and atsorption behaviors of phosphate. The results show that: (1) Hydromica in the clay fraction was predominant in these soils tested, and the content of kaolinite and 1.4 nm mineral was very low. (2) The amount of negative charge (CEC 8.2 ) for them was changed from 9.2 cmol/kg to 19.1 cmol/kg, and the anion exchange capacity (AEC) for them was 0.75～2.21 cmol/kg. All samples contained variable negative charge (CECv), even the rate of CECv to CEC 8.2 was less than 50%. (3) The amount of phosphate absorbed for varied different soils, which was corresponding to the clay mineral constituents and surface properties of the soils.