太湖地区水稻土pH及重金属元素有效态含量变化影响因素初探

通过调查研究及现场采样分析，探讨了太湖地区水稻土 pH和重金属有效态含量的变化趋势及影响因素。结果表明，基于经济快速发展影响下，太湖地区水稻土近十几年间发生了土壤 pH降低、重金属元素有效态含量升高的明显变化，指出近十几年间该地区化肥投入水平和结构的变化，酸雨强度和频率逐年增加，是导致上述变化的主要原因。土壤地球化学性质的不同是导致变化幅度差异的内在因素。

Factors Affecting pH and Availability of Heavy Metals in Paddy Soils in Taihu Lake Area

Under impact of accelerated economic development, paddy soils in Taihu Lake area have undergone decreasing pH and increasing availability of heavy metals in last decade. Data presented in this paper indicated that increasing fertilizer input and intensity and frequency of acid rain deposition are two main reasons responsible for decreasing pH and increasing availability of microelements.