四川盆地紫色水稻土胶体电荷性质研究  

STUDIES ON THE PROPERTIES OF COLLOIDAL CHARGE IN PURPLE PADDY SOILS IN SICHUAN

作　　者：王军[1] 陈世正[1] 

机构地区：[1]西南农业大学土化系

出　　处：《西南农业大学学报（自然科学版）》1991年第5期511-517,共7页Journal of Southwest Agricultural University

基　　金：高等学校博士学科专项科研基金

摘　　要：四川盆地中性、石灰性和酸性紫色水稻土胶体负电荷分别为47.9±9.7、37.6±10.0和48.2±11.0m·e/100g,负电荷密度分别为15.2±3.1、12.2±3.2和10.1±2.3μc/cm^2,负电荷性质极大地受蒙脱石、蛭石、14A。过渡矿物含量的影响。pH值对酸性紫色水稻土胶体负电荷的影响最大,其次是中性和石灰性紫色水稻土。3种土壤胶体有90％以上的负电荷是永久负电荷。有机质对3种土壤胶体负电荷的影响不明显。去游离氧化铁后,3种土壤胶体负电荷均有降低趋势。去除非晶质氧化铝能显著地释放负电荷点。羟基释放量与电荷的pH值因变性之间有密切关系。The present paper deals with the properties of negative charge of three purple paddy soils in Sichuan Basin and the factors influencing the negative charge (clay minerals, pH, organic matter, free iron oxides and amorphous substances). The relation between the amouni of release of hydroxyl and the variation of charge with pH has also been discussed. The negative charge of neutral calcareous and acid purple paddy soil colloids was found to be 47.9±9.7, 37.6±10.0 and 48.2±11.0m.e./100g, respectively, and the charge density—15.2±3.1, 12.2±3.2 and 10.1±2.3μc/cm, respectively. The propertics of negative charge of the three soil colloids were chiefly influenced by the content of montmorillonitc and vermiculitc, while organic matter, free iron oxides and amorphous substances exerted but a minor effect. pH had the greatest influence on the negative charge of acid purple soil colloids. There was a close relation between the pH-dependent charge and the amount of the release of the hydroxyl gruop. The permanent negative charge of those soil colloids accounted for more than 90% of the tolal negative charge.

关 键 词：紫色土 水稻土 胶体 电荷性质 四川盆地 

分 类 号：S155.292[农业科学—土壤学] S153.3[农业科学—农业基础科学]