摘要
本工作选用二种可变电荷土壤粘粒(<2μ),分别含有0.35×10^(-4)-1.3×10^(-4)mol/L的不同电解质,在不同含水量下,在5—50℃范围内测量其直流电导率的变化。试验结果表明,电导热散法是研究土壤粘粒与离子相互作用的有用手段;电导率-温度曲线上的折点温度是随含水量、电解质种类和土壤类型而不同。在相同含水量下,含有不同电解质的红壤体系的折点温度具有如下的变化顺序:CaCl_2>Na_2SO_4>KCl>Ca(NO_3)_2>NaNO_3;砖红壤体系的折点温度明显高于红壤体系。折点温度的高低是土壤粘粒与离子相互作用强度的反映。
In this study, direct current (DC) conductivities in the system which was composed of the clay fraction (<2μ) of variable charge soil and electrolyte solution with a concentration of 0.35×10^(-4)—1.3×10^(-4) mol/L were measured within the range of 5—50℃. The results showed that heated conductivity dispersion could be used for investigating interactions between ions and the clay fraction of soils. The temperatures at turning points on DC conductivitytemperature curves varied with the content of water, kind of electrolytes, and type of soils. At the same content of water, the temperatures at turning points for the system of red earth containing different electrolytes were in the sequence of CaCl_2>Na_2SO_4>KCl>Ca(NO_3)_2>NaNO_2. The temperatures at turning points for latosol system were apparently higher than chose for red earth system. The difference in temperatures at turning points is interpreted in terms of the strength of the interaction between the ion and the clay particle.
出处
《土壤学报》
CAS
CSCD
北大核心
1992年第1期57-63,共7页
Acta Pedologica Sinica
基金
中国科学院自然科学基金
