滇池底泥堆场次生植被富集污染物调查

对滇池周边3个底泥堆场次生演替恢复过程中主要植物的生态学特征和污染物富集情况进行了调查。结果表明：随着底泥堆场由表流湿地向潜流湿地过渡，植被的整体含水量逐渐减少，种群密度逐渐增加；3个底泥堆场优势种的生物量随着植被恢复时间的增长而逐步减少；植物优势种富集某种重金属的能力与生物量的相关性系数（Zn〈Cu〈Pb〈As〈Cr〈Cd〈Hg）随富集能力的提高而降低，其中Hg的富集与生物量有较高的相关性；水生植物富集污染物的能力高于陆生植物；水生植物富集污染物能力最强的是凤眼蓝，其次是长柱柳叶菜和水烛；陆生植物富集污染物能力最强的是稗、云南莎草和水蓼。

Investigation on the Pollutants Absorbed by the Secondary Vegetation Growing on Sediment Storage Area of Dianchi Lake

The investigation on the key ecological characteristics of dominant plants growing on sediment storage area of Dianchi lake and the pollutants absorbed by those dominant plants was performed. The results showed that the water content of vegetation gradually decreased and the pollutant amount of vegetation gradually increased with the sediment storage area of Dianchi lake from surface flow wetland turning to subsurface flow wetland. The biomass of dominant plants growing on the three sediment storage area was reducing with the vegetation restoration. The capability of some heavy metals absorbed by dominant plants with the biomass of the dominant plants correlation coeffi- cient （ Zn 〈 Cu 〈 Pb 〈 As 〈 Cr 〈 Cd 〈 Hg） was reducing with the capability increased. The Hg absorbed with biomass of the dominant plants had a higher correlation coefficient. The ability of pollutants absorbed by aquatic plants was better than the land plants. The best aquatic plants which absorbed pollutants on the sediment storage area of Dianchi lake were Eichhornia crassipes, Epilobium blinii and Typha angustifolia lesser. The best land plants of pol- lutants absorbed on the sediment storage area of Dianchi lake were Echinochloa crusgalli, Cyperus duclouxii and Polygonum hydropiper.