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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。
In this paper, the effects of potassium fixation and release on paddy soils derived from different parent materials in Guangdong were studied by laboratory simulation and chemical methods. The results showed that the amount of potassium in paddy soils with sandstone, Pearl River Delta sediments, limestone and basalts increased with the increase of K addition, but contrasted with granite with paddy soils. Sand shale, granite and basalt The potassium content of developed paddy soil was the highest during flooding, while that of paddy soil with sediment and limestone was the highest at constant humidity. The accumulative release and average release rate of non-exchangeable potassium in paddy soil with sediment development were significantly higher In paddy soils developed from other parent materials, the effect of potassium fertilizer on the release of non-exchangeable potassium varies with the types of clay minerals contained in the soil.