25 种观赏植物的重金属富集特性研究

采用10科25种观赏植物进行重金属富集特性试验,它们均能够在受到轻度污染的Cd-Pb-Cu土壤上正常生长.富集系数大多与土壤重金属质量分数显著相关,与各器官生物量不相关,生物量大的植物也有可能富集更多的重金属.凤尾蕨、肾蕨和万寿菊地上部及地下部Cd富集系数均大于1,紫苏地上部及地下部Pb富集系数均大于1,小蚌兰地上部及地下部Cu富集系数大于1,表现出较强的重金属富集能力.地上部富集系数大于1,同时生物量大的观赏植物地上部能积累更多重金属,用于污染修复更具有潜在优势.

Heavy metal enrichment characteristics of 25 kinds of ornamental plants

The enrichment characteristics of 25 kinds of ornamental plants in 10 families were studied. Theresults showed that, they were able to grow normally in soil slightly polluted by Cd-Pb-Cu. Enrichment coefficientmainly associated with heavy metal concentration in soil, and did not associated with the biomass of each organ.Plant with higher biomass may accumulate more heavy metals. The enrichment coefficients for Cd of aboveground andunderground parts of Pteris cretica, Nephrolepis auriculata and Tagetes erecta, the enrichment coefficients for Pb ofaboveground and underground parts of P. frutescens, the enrichment coefficients for Cu of aboveground andunderground parts of Rhoeo spathaceo, were more than 1, indicating that they had strong enrichment ability of heavymetals. Plants with enrichment coefficient of aboveground part more than 1 and larger biomass could accumulatemore heavy metals, and had the potential advantage for pollution remediation