关键词: 乌龙江流域, 芦苇, 重金属, 湿地公园, 富集系数, 转运系数

Abstract: We examined the accumulation effect of heavy metals by reed plants in six major wetlands (Agricultural University Wetland Park, Agricultural University Beach Park, Jinshan Temple Wetland, Liuhuaxi Wetland Park, Wulong River Wetland Park and Huaian Footpath Wetland) along the Wulong River in Minjiang River basin. The inductively coupled plasma emission spectrometer (ICP-AES) was used to measure the contents of heavy metals (As, Zn, Pb, Ni, Cr, Cu) in reed plants, rhizosphere soil, and wetland sediments. The results showed that the pollution index of As in the sediments reached the strong intensity (>3), and that the geoaccumulation index (Igeo) of As reached medium to strong intensity (2-3). Pollution indices of the other five elements were mild and moderate, and the Igeo of those five elements were low to moderate. The potential ecological risk indices of each wetland park were at a slight level, but the As pollution control should be strengthened. The average transport coefficient of As for reeds in each wetland park was 1. As was mainly accumulated in the aboveground part of reeds, indicating that reeds had a good As adaptability. Zn, Pb, Ni, and Cu were mainly enriched in roots of reeds. The reeds in the Agricultural University Beach Park were Pb-enriched, and that in the Huaian Footpath Wetland were Cu-enriched, which could be extended to wetland parks as phytoremediation in the Minjiang River basin with Pb and Cu contents exceeding the standard.

Key words: Wulong River basin, Phragmites australis, heavy metal, wetland park, bioconcentration factor, translocation factor.