应用等温吸附曲线判断水稻土供硅能力 Ⅰ等温曲线方程参数与水稻相对产量的关系

选取低浓度系列平衡液进行等温吸附解吸试验,并结合田间试验的效果,研究了不同水稻土对硅的吸附解吸特征及其与土壤理化性质水稻土供硅能力之间的关系。结果表明:在低浓度梯度条件下,直线方程y=bx-a可以很好地描述土壤对硅的吸附过程。水稻相对产量与a之间存在着极显著的幂指数函数正相关关系,所以,a可以作为评价水稻土供硅能力的指标。

Evaluation of Silicon Supply Capacity in Paddy Soil by Adsorption Isotherm

The adsorption and desorption experiment with low concentration of silicon and pot experiments were conducted by using three paddy soils. The relation between silicon supply capacity and the parameters of adsorption isotherm was studied. The results showed that under low silicon concentration conditions, the linear equation, y=bx-a,was found to be suitable in describing silicon adsorption characteristics of the soils. There were correlations between parameter a, b and c (a/b) with soil properties. There was very significant exponential positive correlation between relative yield and "a" value. Therefore, "a" value can be used as an index for assessing silicon -supply capacity in the paddy soils.