木本植物由于其具有成本效益和生态友好性,因此在修复被重金属污染的土壤方面获得了相当大的关注。然而,大多数关于潜在植物修复评估的研究仅限于温室或田间的短期实验,这意味着实验室结果和在自然环境中的应用之间可能存在差异。在这项研究中,十种蕨类植物.在连续3年的田间试验(2018-2020年)中进行了测试,以评估其对Cd和Zn污染土壤的树状修复能力。结果表明,有9个蕨类植物。表现出良好的生存能力,没有任何压力,除了QuercusvelutinaLam.,在3年成长期。2020年,在9种Quercus属植物中,texanaBuckley和QuercusfabriHance植物产生的生物量最大(2100和1880gplant-1)。2020年的Cd总累积量(39.3mgplant-1)最高,是2018年的8.5倍,其次是槲树塔Raf。(8.85mgplant-1)和Q.fabri(8.07mgplant-1)植物,分别,与2018年相比,Q.宝塔和Q.fabri分别增加了7.4倍和22倍。2020年的结果表明,Q.fabri的锌积累量最高(205mgplant-1),其次是黑松(149毫克植物-1)和Q.texana(140毫克植物-1),分别,与2018年相比,这些值分别增加了14、6.4和6.2倍。提出了综合生物累积指数(CBAI)来评估Quercusspp的树状修复潜力。,表明Q.texana和Q.fabri在修复Cd和Zn污染土壤方面具有最突出的潜力,值分别为0.82和0.60。总之,Q.texana和Q.fabri是修复Cd/Zn污染土壤的理想选择,长期田间试验和CBAI方法有助于综合评价树木的修复能力。
Woody plants have gained considerable attention for remediating soils contaminated with heavy metals because of their cost-efficient and ecologically friendly nature. However, most studies on potential phytoremediation evaluation are limited to short-term experiments in greenhouse or field, meaning that differences may exist between laboratory results and application in natural environment. In this
study, ten Quercus spp. were tested in a consecutive 3-year field
trial (2018-2020) to assess their dendroremediation abilities for Cd and
Zn contaminated soil. The results revealed that nine Quercus spp. demonstrated good survival ability without any stress, except for Quercus velutina Lam., in the 3-year growth period. In 2020, Quercus texana Buckley and Quercus fabri Hance plants produced the greatest biomass (2100 and 1880 g plant-1) among the nine Quercus spp. Quercus texana had the highest total Cd accumulation (39.3 mg plant-1) in 2020, which was 8.5 times higher than that in 2018, followed by Quercus pagoda Raf. (8.85 mg plant-1) and Q. fabri (8.07 mg plant-1) plants, respectively, whereas Cd accumulation increased by 7.4 times for Q. pagoda and 22 times for Q. fabri compared to 2018. The results from 2020 indicated that Q. fabri had the highest
Zn accumulation (205 mg plant-1), followed by Quercus nigra L. (149 mg plant-1) and Q. texana (140 mg plant-1), respectively, and these values increased 14, 6.4, and 6.2 times in comparison to 2018. The comprehensive bioaccumulation index (CBAI) was proposed to evaluate the dendroremediation potential of Quercus spp., suggesting that Q. texana and Q. fabri had the most outstanding potential for remediation of Cd and
Zn polluted soil, with the values of 0.82 and 0.60, respectively. In summary, Q. texana and Q. fabri are ideal for remediating Cd/
Zn-contaminated soil, and long-term field trials and the CBAI method are helpful for comprehensively evaluating the remediation capacity of trees.