State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province, Fujian Normal University, Fuzhou, China.
Institute of Geography, Fujian Normal University, Fuzhou, China.
Int J Phytoremediation. 2020;22(10):1038-1047. doi: 10.1080/15226514.2020.1725870. Epub 2020 Feb 16.
Little is known about the clipping strategy to assist phytoremediation by at rare earth mines. We evaluated the phytoremediation ability of , designed an appropriate clipping strategy, and obtained the phytoextraction time for rare earth elements (REE) by field investigation, laboratory measurement, and statistical analysis etc. at four rare earth mines in south China. . growth and soil nutrients tended to increase across the ecological restoration chronosequence, the total REE content in aboveground biomass was ≥1,000 mg kg, the bioabsorption coefficient and translocation factor were ≥1, and the phytoextraction of light REE was greater than heavy REE. Overall, the REE accumulation did not vary significantly among seasons, the total REE accumulation in the underground biomass accounted for 26.55-64% and the vegetation covers were about 90% two years after clipping. It would take 57.88-168.57 years to reduce soil total REE content, and the soil nutrients and REE accumulations of at Longjing were the highest. has potential for REE phytoextraction and phytostabilization simultaneously. should be clipped in winter once every two years with underground biomass retained. The REE phytoextraction time is long with soil nutrients being important influencing factors.
关于利用修剪策略来辅助稀土矿区的植物修复，目前知之甚少。我们评估了 在稀土矿中的植物修复能力，设计了合适的修剪策略，并通过野外调查、实验室测量和统计分析等方法，获得了中国南方四个稀土矿的稀土元素（REE）的植物提取时间。随着生态恢复时间序列的延长， 的生长和土壤养分趋于增加，地上生物量的总 REE 含量≥1000mg/kg，生物吸收系数和迁移系数≥1，轻REE 的植物提取量大于重REE。总体而言，REE 积累在季节之间没有明显差异，地下生物量的总 REE 积累占 26.55-64%，修剪后两年植被覆盖率约为 90%。要降低土壤总REE 含量，需要 57.88-168.57 年，龙井的土壤养分和 REE 积累最高。 同时具有 REE 植物提取和植物稳定的潜力。 应该在冬季每隔一年修剪一次，保留地下生物量。REE 的植物提取时间较长，土壤养分是重要的影响因素。
