Hu Youning, Wang Dexiang, Wei Lijing, Zhang Xinping, Song Bin
College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100, China.
College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100, China.
Ecotoxicol Environ Saf. 2014 Dec;110:82-8. doi: 10.1016/j.ecoenv.2014.08.021. Epub 2014 Sep 7.
Urban plants are capable of reducing environmental pollutions through bioaccumulation contaminants in their tissues. The accumulation of heavy metals (Pb, Cu, Cd, Cr, and Zn) in leaves of nine tree species and five shrub species from Yan׳an city of China were investigated, and total metal accumulation capacities of different plants were evaluated using the metal accumulation index (MAI). The results indicated that plants in polluted environments are enriched in heavy metals relative to those in pristine environments, this is mainly caused by traffic emissions and coal combustion. Species with the highest accumulation of a single metal did not have the highest total metal accumulation capacity, the MAI should be an important indicator for tree species selection in phytoextraction and urban greening. Considering total accumulation capacities, Sabina chinensis, Juniperus formosana, Ailanthus altissima and Salix matsudana var. matsudana could be widely used in the Loess Plateau.
城市植物能够通过在其组织中生物累积污染物来减少环境污染。对中国延安市9种乔木和5种灌木叶片中重金属（铅、铜、镉、铬和锌）的积累情况进行了调查，并使用金属积累指数（MAI）评估了不同植物的总金属积累能力。结果表明，与原始环境中的植物相比，污染环境中的植物富含重金属，这主要是由交通排放和煤炭燃烧造成的。单一金属积累量最高的物种并不具有最高的总金属积累能力，MAI应成为植物提取和城市绿化中树种选择的重要指标。考虑到总积累能力，圆柏、台湾桧、臭椿和旱柳变种旱柳可在黄土高原广泛应用。
