【摘要】 以北京道路绿地37种常用园林植物为研究对象,实地取样并测定了植物地上部及其根系周围土壤Cd、Zn、Pb、Cu 4种重金属含量,利用富集系数指标和聚类分析法,分析比较37种植物对4种重金属的富集力及其等级水平,对其生态修复价值进行初步评价,以期为北京地区绿化植物的选择提供理论依据和参考,提高绿地系统生态防护效能。结果表明,37种植物对Cd、Zn、Pb、Cu的富集系数范围分别为0.07～0.68、0.25～1.13、0.01～0.30、0.10～0.32;对4种重金属的平均富集力表现为Zn>Cd>Cu>Pb;对Cd富集力强的植物为金叶女贞;对Zn富集力强的植物为紫丁香;对Pb富集力强的植物有栾树、洋白蜡、构树、月季;对Cu富集力强的植物有榆树、桑树、英桐、珍珠梅;对4种重金属综合富集能力最强的植物是紫丁香、金叶女贞、小叶黄杨。更多还原

【Abstract】 Taking 37 common garden plants in Beijing road greenland as research objects,the contents of heavy metals such as Cd,Zn,Pb and Cu in the aboveground parts of plants and soils around the roots were measured by field sampling method.The enrichment coefficient index and cluster analysis method were used to analyze the enrichment ability and levels for 37 plant species.Their values of ecological restoration were preliminarily evaluated to provide theoretical basis and references for the selection of greening plant species in Beijing and to improve the ecological protection efficiency of green space system.The results showed that the enrichment coefficients of 37 plants for Cd,Zn,Pb and Cu were 0.07～0.68,0.25～1.13,0.01～0.30,and 0.10～0.32.The average enrichment ability of plants for four heavy metals was in the order of Zn > Cd > Cu > Pb.The plant species with strong Cd and Zn enrichment ability were Ligustrum×vicaryi and Syringa oblata.The plant species with strong Pb enrichment ability were Broussonetia papyrifera,Fraxinus pennsylvanica,Koelreuteria paniculata,and Rosa chinensis.The plant species with strong Cu enrichment ability were Morus alba,Ulmus pumila,Platanus×acerifolia,and Sorbaria sorbifolia.The plant species with strong comprehensive enrichment ability were S.oblata,L.×vicaryi,and Buxus sinica.更多还原