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本工作选用了6个可变电荷土壤原土标卒,加入不同量的SO_4~(2-)后测定其在不同pH时对SO_4~(2-)的吸附量或释放量,发现SO_4~(2-)吸附量随SO_4~(2-)加入量增加而增加,随pH升高而减少。除砖红壤外,其余土壤在加入不同量SO_4~(2-)时的SO_4~(2-)吸附量与pH的关系曲线有最终汇集于某pH的趋势。根据恒定pH条件下SO_4~(2-)加入量和吸附量之间的直线关系,方程的斜率反映土壤对SO_4~(2-)亲和力的强弱,发现各土壤对SO_4~(2-)的亲和力有显著差异,且均随pH升高而减弱。反应土壤库(RSP)的值可用来作为衡量土壤活性SO_4~(2-)或有效SO_4~(2-)的一个尺度。除砖红壤外,其余各土的RSP值随pH升高而增加。
In this work, 6 variable-charge soil samples were selected and the amount of SO 4 2- absorbed or released at different pH was determined by adding different amount of SO 4 2-. 2-) The amount of adsorption increases with the amount of SO 4 2- added, but decreases with the increase of pH. Except brick red soil, the relationship curves of SO 4 2- adsorption amount and pH in the remaining soils with the different amounts of SO 4 2- added to some pH eventually converged. The slope of the equation reflects the affinity of SO_4 ~ (2-) to soil, and found that SO_4 ~ (2-) content in soil is linearly proportional to the amount of SO_4 ~ (2-) There were significant differences in affinities, both of which decreased with increasing pH. The value of RSP can be used as a measure of soil active SO 4 4- (2-) or available SO 4- 2-. Except brick red soil, the RSP value of other soil increased with the increase of pH.