关键词: 铁皮石斛, 产地环境, 重金属, 污染评价

Abstract: Thirty\|four artificially cultivated Dendrobium officinale Kimura et Migo samples，27 matrix samples and 16 water samples were collected from 6 towns of Yueqing including Dajing，Danxi，Hongqiao，Xianxi，Yandang and Furong. The content of Pb，Cd，Cu，Hg in these samples had been determined and their pollution status had been evaluated by both single factor comprehensive pollution index method and Nemerow pollution index method. The results showed that indexes for Dendrobium officinale Kimura et Migo were less than 06, which indicated that Dendrobium officinale Kimura et Migo had not been polluted by heavy metals，as well as the water. Analysis showed that the subatrate was clean and met the requirement for the development of pollution\|free Dendrobium officinale Kimura et Migo，but the content of Cd should be strictly controlled. The single factor comprehensive pollution index of Cd in substrate was 133，which suggested that the substrate had been slightly polluted, while the Nemerow pollution index was 097， which almost reached the warning line.

Key words: Dendrobium officinale Kimura et Migo, origin environment, heavy metal, pollution evaluation