长江中下游第四纪沉积物发育土壤的研究─—电荷特性及其分类意义

Studies on genetic properties of soils derived from, quaternary sediments in the mid-lower reaches of the Yangtze river:Ckarg.ckaracteristics and its significance in soil classification.

对长江中下游地区第四纪沉积物发育土壤的电荷特性作了初步研究，结果表明：①土壤有效阳离子交换量（ＥＣＥＣ）值，粘盘壤＞粘盘黄棕壤＞棕红壤＞红壤；阴离子交换量ＡＥＣ，可变电荷量ＣＥＣｖ／ＣＥＣ＿３．２，电荷零点ｐＨ＿０，粘盘壤＞粘盘黄棕壤＞棕红壤＞红壤。②土壤的电荷特性与土壤的粘粒矿物组成和氧化物数量有关，它可以很好地显示土壤的发育程度，③土壤的电荷特性可用于土壤分类，作者对此提出了相应的指标值。

Preliminary studies were conducted to explore the charge characteristics of soils derived from mid-late pleistocene sediments,developed under the transitional zone of subtropic to warmer temperate climate in the mid-lower reaches of the Yangtze river,The results indicated tkat :①the values of soil effective cation exchange capacity(ECEC)was in the increasing order of red soil,brown red soil,claypanic yellow brown soil and planosol,but a reverse order was found for AEC,CECv/CEC_3 2 and pH_0. ②soil charge characteristics were related to the clay mineral type and content of Fe and Al oxides, reflecting the degree of soil development.③soil charge character- istics could be used in soil classification,and the index values for classification were proposed in this paper.