Liu Yan-Ju, Zhu Yong-Guan, Ding Hui
Beijing Center for Physical and Chemical Analysis, Beijing 100089, China.
Environ Pollut. 2007 Jan;145(2):387-90. doi: 10.1016/j.envpol.2006.05.010. Epub 2006 Jun 21.
Lead and cadmium uptake was investigated for common deciduous street trees in Beijing in this study. Species having Cd accumulation included Populus tomentosa, Sophora japonica and Catalpa speciosa. P. tomentosa had the highest ratios between leaf and soil Cd (0.848), followed by S. japonica (0.536), C. speciosa (0.493), Paulownia tomentosa (0.453) and Juglans regia (0.415). Pb levels were high in leaves of C. speciosa, J. regia and Pa. tomentosa. S. japonica had the highest ratio between leaf Pb and soil Pb (0.146), followed by Pa. tomentosa (0.143), Ginko biloba (0.103) and C. speciosa (0.095). A predictive foliar metal accumulation index (MAI) was developed and C. speciosa was calculated to have the highest MAI value (53.8). This suggests that C. speciosa would be a good choice for planting in areas of Beijing where soil contamination with Cd and Pb may be a problem.
本研究对北京常见的落叶行道树的铅和镉吸收情况进行了调查。镉积累量较高的树种包括毛白杨、国槐和梓树。毛白杨的叶片与土壤镉含量比值最高（0.848），其次是国槐（0.536）、梓树（0.493）、兰考泡桐（0.453）和核桃（0.415）。梓树、核桃和兰考泡桐叶片中的铅含量较高。国槐的叶片铅与土壤铅含量比值最高（0.146），其次是兰考泡桐（0.143）、银杏（0.103）和梓树（0.095）。开发了一个预测性叶部金属积累指数（MAI），计算得出梓树的MAI值最高（53.8）。这表明，在土壤镉和铅污染可能成为问题的北京地区，梓树是一个很好的种植选择。
