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本文选择我国五种不同地带土壤分别提取<2μm胶体,并进行土壤胶体比表面和电荷性质的研究.结果表明,五种土壤胶体比表面和负电荷量为黑土>黄棕壤>黄绵土>红壤>砖红壤.电荷零点(ZPC)为砖红壤>红壤>黄绵土>黄棕壤>黑土.其中砖红壤和红壤胶体在pH>5时负电荷量明显增加,而黑土和黄棕壤胶体则无此变化.五种土壤胶体比表面和负电荷量与2:1型粘土矿物量呈显著正相关(r=0.943~(**)),而与高岭石和游离氧化铁量呈负相关,电荷零点(ZPC)却与游离 Fe_2O_3量呈显著正相关(r=0.955~(**)).
The results showed that the specific surface area and the negative charge of the five soil colloids were black soil> yellow brown soil> loessial soil> red soil> The red soil of red brick> red soil> yellow soil> yellow brown soil> black soil were the zero point of charge (ZPC), and the negative charge of brick red soil and red soil colloid obviously increased at pH> 5, but no change of black soil and yellow brown soil colloid The specific surface area and the negative charge of five kinds of soil colloids were positively correlated with the amount of 2: 1 type clay minerals (r = 0.943 ~ (**)), negatively correlated with the amount of kaolinite and free iron oxide, ZPC) had a significant positive correlation with the amount of free Fe 2 O 3 (r = 0.955 ~ (**)).