水稻－土壤生态系统对Cu、As污染的缓冲作用

通过对冶炼厂区周围水系、土壤和水稻中Ｃｕ、ＡＳ含量分析，探讨其对农田生态环境的影响．结果表明，各稻田耕作层渗出水和相邻塘水中的Ｃｕ平均浓度分别为０．０５９和０．０７ｂｍｇ·Ｌ（－１），Ａｓ为３１．６８和４２．７９μｇ·Ｌ（－１），稻田土壤中未出现Ｃｕ、Ａｓ明显的梯度累积变化以及水稻能吸收累积相当数量的Ｃｕ、Ａｓ，它们大部分累积在根部．可以认为，水稻一土壤生态系统本身对Ｃｕ、ＡＳ污染具有相当大的缓冲作用．

Buffer action to rice-soil ecosystem to Cu and As pollution

The Cu and As contents in waters,soils and rice plants around a smeltery are analysed ,and their effects on farmland eec-environment are studied. The average concentration of Cu and As in percolated water from paddy soil and in adjacent ponds is respectively 0. 059and 0. 070 mg. L(-1) and 31. 69 and 42. 79pg. L(-1). No significant variation of gradient accumulation of Cu and As is found in paddy soil, and a quite amount of Cu and As is absorbed and accumulated by rice, especially by its root. It is considered that the rice-soil ecosystem itself has a relatively high buffer action to Cu and As pollution.