Little is known about the clipping strategy to assist phytoremediation by Dicranopteris dichotoma at rare earth mines. We evaluated the phytoremediation ability of D. dichotoma, 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. D. dichotoma growth and soil nutrients tended to increase across the ecological restoration chronosequence, the total REE content in aboveground biomass was ≥1,000 mg kg⁻¹, 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 D. dichotoma at Longjing were the highest. D. dichotoma has potential for REE phytoextraction and phytostabilization simultaneously. D. dichotoma 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.

关于在稀土矿中协助双歧鳞茎植物修复的修剪策略知之甚少。我们评估了D. dichotoma的植物修复能力，设计了适当的修剪策略，并通过现场调查，实验室测量和统计分析等方法获得了华南地区四个稀土矿的稀土元素（REE）的植物提取时间。d。萁生长和土壤养分倾向于横跨生态恢复年代序列来增加，在地上生物量的总REE含量为≥1,000毫克千克^-1，轻质稀土元素的生物吸收系数和转运因子≥1，而重质稀土元素的植物提取率更高。总体而言，REE的累积量在各个季节之间变化不大，修剪后两年，地下生物量的REE累积量占26.55–64％，植被覆盖率约为90％。减少土壤中的总稀土含量需要57.88–168.57年，而龙井D麦的土壤养分和REE积累最高。D. dichotoma具有同时进行REE植物提取和植物稳定的潜力。双歧杆菌冬季每两年应修剪一次，保留地下生物量。稀土元素的植物提取时间长，土壤养分是重要的影响因素。