应用吸附等温曲线判断水稻土供硅能力 Ⅱ吸附等温曲线方程参数与水稻土理化性质的关系

选取低浓度系列平衡液进行等温吸附试验,研究了不同pH水稻土对硅的吸附等温曲线方程参数与土壤理化性质之间的关系。结果表明:土壤吸附硅的缓冲容量(PBCSi)与土壤粘粒含量呈线性正相关关系(r=0.7745**,n=12),与土壤pH呈对数正相关关系(r=0.8660**,n=12);土壤吸附硅的零位浓度(ZACSi)与土壤游离氧化铁含量呈对数正相关关系(r=0.5801*,n=12),与土壤pH呈指数负相关关系(r=0.8661**,n=12);评价土壤供硅能力指标的参数与土壤氧化铁活化度呈指数负相关关系(r=0.6026*,n=12),与氧化铁晶胶比呈幂函数正相关关系(r=0.5950*,n=12)。

Evaluation of Silicon Supplying Capacity in Paddy Soil by Adsorption Isotherm ⅡThe Relationship between Parameter of Adsorption Isotherm Equation and Properties of Paddy Soils

The adsorption and desorption experiments with low concentration silicon were conducted on twelve paddy soil,and the relations between the parameters of adsorption isotherm and properties of paddy soils were studied. The results showed that, there were linear positive correlations between parameter (PBC~(Si))and soil clay (r=0.7745~(**),n=12), and logarithmic positive correlations and soil pH (r=0.8660~(**),n=12); there were logarithmic positive correlations between parameter (ZAC~(Si)) and DCBFe (r=0.5801~*,n=12), and exponential negative correlations and soil pH (r=(0.8661~(**)),n=12); there were exponential negative correlations between parameter and Fe_o/Fe_d (r=0.6026~*,n=12), and power function positive correlations and (Fe_d-Fe_o)/Fe_o (r=0.5950~(**),n=12).