贵州独山地区山地土壤施用石灰对钾素平衡规律的研究

THE STUDY ON POTASSIUM EQUILIBRIA IN LIMING SOIL IN DU SHAN COUNTY OF GUIZHOU

关于贵州省南部土壤施用石灰对钾平衡影响,及施用石灰于山地土壤能致平衡溶液土壤含钾量降低,将减少钾的自然流失,使白三叶草钾含量增加这一现象,已引起国外土壤学者广泛关注。我们采用Q/I曲线讨论该地区二种类型土壤施用石灰影响钾平衡的各项因子,结果表明:施石灰可使交换钾降低,其变化影响的参数是缓冲容量PBC^K变大;强度因子ARo^k减少。 此外我们采用Ca(OH)_2实验室淋洗土壤,测定其BC^K,ARo^K、可交换钾、平衡溶液中钾等实验参数与田间石灰处理土壤结果吻合,有良好相关性,表明采用此法实验室模拟田间施用石灰讨论钾在土壤中平衡方法是可行的。

Many soil scientists in the world have attended in these facts, lime effect of Potassium equilibria in soil of Du Shan county, lower amounts of K teachability of native and increasing K to white clover. The quantity-intensity (Q/I) approach was applied to make an inquiry into factors of liming on K equilibria in two type soils.It has shown that the exchangeable K values were decreased by liming and the greatest changes in liming were observed decrease in the intensity factor, AR0k, and increase in the buffer capacity for K, BCk. Besides, when soil was leached with Ca(OH)2 in the laboratory, BCk, AR0k, exchangeable K values etc. were identical with field experiments. So we consider that leaching method in the loboratory can be applied to study potassium equilibria in liming soil.