影响四川紫色水稻土胶体水化性质的主要因素

MAIN FACTORS INFLUENCING HYDRAT1ON OF PURPLE PADDY SOIL COLLOIDS IN SICHUAN

选用膨润值作为指标研究了四川三种主要紫色水稻土胶体的水化性质及其主要影响因素。结果表明,2:1膨胀性粘土矿物含量对膨润值影响较大;介质pH与膨润值间里正相关关系;有机质和游离氧化铁与膨润值呈负相关;羟基释放量与膨润值间有一定相关性;膨润值与比表面、阳离子交换量及电动电位间相关性不明显。

Used the swelling value as index the hydration of three main purple paddy soils in Sichuan and their influencing factors were studied. The result indicated that the 2:1 content of expanding clay influenced the swelling value largely. There was a positive correlation between the swelling value and the pH of medium, and a negative correlation between the swelling value and the amount of organic matter and free ferric oxide. The correlation between the swelling value and the amount of released-oH was obvious, but it wasn't obvious between the swelling value and the specific surface area, the capacity of cation exchange or electromo tive force of soil colloid respectively.