紫色土的钾素形态转化

采用室内盆钵培养方法 ,研究侏罗纪蓬莱镇组 (J3P)、沙溪庙组 (J2 S)、遂宁组 (J3S)和白垩纪城墙岩群 (K1 C)紫色岩层发育土壤的钾素形态转化。结果表明 ,一年后 ,紫色土交换性钾增加 2 0mg.kg- 1 以上 ,非交换性钾增加 10 .5 8mg .kg- 1 ,结构钾减少了 31.5 6mg .kg- 1 。交换性钾、非交换性钾增加顺序分别为 :J3P >J3S >J2 S >K1 C及K1 C >J3P >J2 S >J3S ;结构钾降低的顺序为 :J3P >J3S >K1 C >J2 S。紫色土交换性钾、非交换性钾及结构钾互为消长有利于土壤源源不断地供给作物有效态钾素 ,一定程度弥补因作物带走的钾。

Studies on forms transformation of potassium in purple soil

Indoor incubation experiments were conducted to study potassium forms transformation in the soil developed from the purplish rocks formed in the Jurassic (group penglaizhen-J3P, group shaximiao-J2S,and group suining-J3S) and Cretaceous (group chengqiangyan-K1C) period. Results showed exchangeable K of the purple soil increases more than 20 mg/kg,non-exchangeable K increases about 10.58 mg/kg.But mineral K decreased 31.56 mg/kg.The exchangeable K and non-exchangeable K increase in the sequence as J3P> J3S>J2S>K1C and K1C >J3P> J2S> J3S respectively, whereas mineral K decrease in the sequence as J3P> J3S >K1C >J2S.The relationships between exchangeable , non-exchangeable and mineral K in purple soil indicate the continuous supply available K to crops, so that ,to some extent, make up a loss of potassium absorbed by corps .