Growth and heavy metal accumulation of Paulownia fortunei and Koelreuteria bipinnata in an ecological restoration site of the manganese-ore tailing
OUYANG Lin-nan1, WU Xiao-fu1, LI Yun1,2, FENG Chong-ling1,2, CHEN Yong-hua1
1. College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;
2. Research Center of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
A four hectare ecological restoration plot using wood species P. fortunei and K. bipinnata as phytoremediation plants was established in the Xiangtan manganese-ore tailing. The total average content of Mn at the project site was 20041mg/kg. The total average contents of Pb, Zn, Cu and Cd at the site were also much higher than the background values of Hunan province and China, showing a high level of multiple heavy metal contamination. The metal contaminated site was not sealed with normal soil. Before transplanting the seedlings, the rooting areas of the wood species at the experimental site were amended with organic manure containing a tolerant bacterium strain isolated from the mining wastes. In the second year after transplanting, the survival rates of both P. fortunei and K. bipinnata were higher than 83%. Species P. fortunei had apparently a higher growth rate than K. bipinnata. The contents of all measured metal elements were higher in leaves than in roots and stems of both species. The contents and uptake of Mn, Cu and Zn of P. fortunei were significantly higher than those of K. bipinnata. The total manganese uptake of five years old P. fortunei reached 2295g/hm2with a quantity transfer coefficient (the ratio of above to below ground uptake) of 2.32. In combination with the application of organic manure to improve the root growth environment, both P. fortunei and K. bipinnata could be used as phytoremediation tree species for manganese contaminated soil. In comparison, P. fortunei was superior to K. bipinnata as accounted for by their growth rates and nature in metal tolerance and uptake.
欧阳林男, 吴晓芙, 李芸, 冯冲凌, 陈永华. 锰矿修复区泡桐与栾树生长与重金属积累特性[J]. 中国环境科学, 2016, 36(3): 908-916.
OUYANG Lin-nan, WU Xiao-fu, LI Yun, FENG Chong-ling, CHEN Yong-hua. Growth and heavy metal accumulation of Paulownia fortunei and Koelreuteria bipinnata in an ecological restoration site of the manganese-ore tailing. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(3): 908-916.
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