广东不同母质发育水稻土钾素的固定与释放

本文通过室内模拟和化学方法研究了广东几种不同母质发育的水稻土的钾素的固定与释放特性。结果表明,砂页岩、珠江三角洲沉积物、石灰岩和玄武岩发育的水稻土的固钾量均随钾加入量的增加而增大,但花岗岩发育的水稻土却相反;砂页岩、花岗岩和玄武岩发育的水稻土的固钾量在淹水时最高,而沉积物和石灰岩发育的水稻土则在恒湿时最高;沉积物发育的水稻土的非交换性钾累计释放量和平均释放速率显著高于其它母质发育的水稻土;施钾肥对非交换性钾释放的影响因土壤所含粘土矿物类型而异。

Potassium Fixation and Release in Paddy Soils Derived from Different Parent Materials in Guangdong Province

The characteristic of Potassium fixation and release of the key paddy soils derived from different parent materials was studied by an simulation experiment and chemical methods.The results showed that K fixation in soils derived from sandstone,Pearl River Delta deposits,limestone and basalt increased with the increasing of K application,however,the soil derived from granite had the contrary situation.K fixation of soils derived from sandstone,granite and basalt was supreme when submerging water,while it was supreme to soils derived from Pearl River Delta deposits and limestone when wetting.The total amount and mean release rate of non-exchanged Potassium of soil derived from Pearl River Delta deposits were higher significantly than that of the others soils.The factor affecting non-exchanged potassium release of soil by K application was varied with the soil mineral type.