College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China.
College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China.
Ecotoxicol Environ Saf. 2019 Jul 30;176:42-49. doi: 10.1016/j.ecoenv.2019.03.078. Epub 2019 Mar 25.
In order to investigate the toxicity-resistance of eighteen Chinese native plants in lead (Pb)-zinc (Zn) mine tailings, we categorized their resistance to Pb and Zn, and tested their potential for phytoremediation effectiveness of Pb and Zn. Fourteen woody plant species belonging to 12 families, and 4 herbaceous species belonging to 4 families, were grown in pots with mixtures of 100% tailing +0% peat (CK), 90% tailing +10% peat (A1), and 80% tailing + 20% peat (A2), respectively. Plant height and biomass, chlorophyll content, and Pb and Zn contents of non-rhizosphere spoil mixtures and plant tissues were measured. Fifteen of the plants grew in all three spoil mixtures. Both A1 and A2 had higher plant height and biomass increment and chlorophyll contents than CK. The content of Pb and Zn in plant shoots and roots was CK > A1 > A2. The value of BCF less than 0.1, compared to 1, was a more precise classification basis for plants excluding metals. Screening for Pb and Zn resistant plants and their bioremediation potential produced the following candidate species: Sapium sebiferum, Salix matsudana, Hibiscus cannabinus, Corchorus capsularis, Ricinus communis, and Populus nigra. These species were highly Pb and Zn tolerant species, with notable growth characteristics and capacities to bioaccumulate Pb and Zn from the mine tailings. Compared to CK, the removal of Pb and Zn from non-rhizosphere spoil increased by an average of 9.64% and 9.6%, respectively in A1, but decreased in A2. The results indicated candidate species and 10% peat addition in the tailing were significant in phytoremediation of Pb and Zn regarding environmental safety.
为了研究十八种中国本土植物在铅锌矿尾矿中的抗毒性和耐受力，我们对其抗铅锌能力进行了分类，并测试了它们在铅锌矿修复方面的潜在有效性。我们在花盆中种植了 14 种木本植物，分别属于 12 个科，以及 4 种草本植物，分别属于 4 个科，这些植物的混合物分别为 100%尾矿+0%泥炭（对照）、90%尾矿+10%泥炭（A1）和 80%尾矿+20%泥炭（A2）。我们测量了植物的高度和生物量、叶绿素含量以及非根际土壤混合物和植物组织中的铅锌含量。其中有 15 种植物在所有三种尾矿混合物中都能生长。A1 和 A2 的植物高度和生物量增长率以及叶绿素含量均高于对照。植物地上部分和根系中的铅锌含量表现为 CK＞A1＞A2。BCF 值小于 0.1，与 1 相比，是更精确的植物排除金属的分类依据。筛选出耐铅锌的植物及其生物修复潜力的结果产生了以下候选物种：乌桕、垂柳、苘麻、黄麻、蓖麻和黑杨。这些物种对铅锌具有高度的耐受性，具有显著的生长特性和从尾矿中生物累积铅锌的能力。与对照相比，A1 中非根际土壤中铅锌的去除率分别平均增加了 9.64%和 9.6%，而 A2 中则减少了。结果表明，候选物种和尾矿中添加 10%的泥炭在铅锌的植物修复方面对于环境安全是有意义的。
