Abstract: 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 0.059 and 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.

Key words: Cu and As pollution, Waste water irrigation, Buffer action, Farmland ecosystem, Populus davidiana, sap flow velocity, Quercus liaotungensis, environmental factors, soil moisture