海口交通要道行道树叶片中重金属含量累积效用研究

A Study on the Accumulative Effect of Heavy Metal Content in Tree Leaves along the Main Traffic Routes in Haikou

摘要: 采集海口市龙昆南路和万绿园区域榕树、凤凰木、糖胶树、叶子花、金叶女贞和地毯草6种行道树叶片及土壤样品，用电感耦合等离子体发射光谱仪检测Cr、Mn、Zn、Cu、Pb、Ni、Co、Cd和Ag共9种重金属含量，运用SPASS分析土壤重金属和植物叶片中重金属相关系数以及6种植物的重金属富集系数。结果表明：龙昆南路土壤九种重金属含量均小于参考值，土壤无明显重金属污染；六种植物叶片的重金属含量有显著差异，地毯草对重金属吸收能力突出，可作为海口市绿化主力。

Abstract: Leaves and soil samples of five kinds of street trees, Ficus microcarpa, Delonix regia, Alstonia scholaris, Bougainvillea spectabilis Willd, Ligustrum × vicaryi Rehder and Axonopus compressus, were collected from Longkun South Road and Wanlv Park. The contents of Cr, Mn, Zn, Cu, Pb, Ni, Co, Cd and Ag were determined by ICP-EIS. The origin of heavy metals in soil and the heavy metal enrichment coefficient of six tree species were analyzed by SPASS. The results showed that the contents of heavy metals in the soil were all lower than the reference value, and there was no heavy metal pollution in the soil. There were significant differences in metal content of the leaves of the six plants. Axonopus compressus had outstanding enrichment ability of heavy metals, which could be used as the main greening force in Haikou.