酸雨对旱地红壤磷素释放的影响研究

为了探明酸雨对红壤磷素释放的诱导效应 ,采用室内模拟酸雨淋溶土柱的方法 ,研究了酸雨作用下旱地红壤磷素释放的特征与规律 .结果表明 ,从长期的淋溶效果来看 ,酸雨可促进红壤磷的释放 ,且酸雨pH值越低 ,磷累积释放量越大 ;磷释放的动态变化在不同土壤之间存在一定的差异 .红壤磷素的释放强度主要取决于土壤有效磷含量 ,而与阳离子交换量关系不大 .磷释放量与钙释放量相关性很弱 ,与铝释放量呈较强的正相关性 ,与铁释放量呈显著的正相关性 .酸雨对红壤磷释放的促进作用主要是由于酸雨对铁铝化合物尤其是铁化合物的溶蚀作用所至 .

The influence of acid rain on the release of phosphorus from upland red soils

A soil leaching column experiment was designed to investigate the release of phosphorus from upland red soils under the influence of simulated acid rain.The results show that,the lower values of pH of the simulated acid rain,the more phosphorus is released.There is a difference in the release of phosphorus among various soils.The release of phosphorus is mainly dependant on the content of available phosphorus,but has little correlation with cation exchange capacity.There is a weak correlation between the release of P and the release of Ca,a relatively strong correlation between the release of P and the release of Al,a remarkable correlation between the release of P and the release of Fe. these results indicate that the promotion of acid rain on the release of phosphorus is due to the solubilization effect of acid rain on iron compounds and aluminum compounds,especially on iron compounds.