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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。
The isobaric adsorption and desorption experiments were carried out with a series of low-concentration equilibration solutions. The adsorption-desorption characteristics of silicon in different paddy soils and their relationship with the silicon-supplying ability of soil physical and chemical properties in paddy soil were studied. The results show that the linear equation y = bx-a can describe the adsorption of silicon to soil well under low concentration gradient conditions. A significant positive exponential function exists between the relative yield of rice and a, so a can be used as an index to evaluate the ability of silicon supply for paddy soil.