Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China; Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area, MNR, Guilin 541004, China.
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China.
J Hazard Mater. 2024 Jul 5;472:134551. doi: 10.1016/j.jhazmat.2024.134551. Epub 2024 May 9.
Most hyperaccumulators cannot maintain vigorous growth throughout the year, which may result in a low phytoextraction efficiency for a few months. In the present study, rotation of two hyperaccumulators is proposed to address this issue. An 18-month field experiment was conducted to evaluate the phytoextraction efficiency of Cd by the monoculture and rotation of Celosia argentea and Sedum plumbizincicola. The results showed that rotation increased amount of extracted Cd increased by 2.3 and 1.6 times compared with monoculture of C. argentea and S. plumbizincicola. In rotation system, the biomass of S. plumbizincicola and Cd accumulation in C. argentea increased by 54.4% and 40.7%, respectively. Rotation reduced fallow time and increased harvesting frequency, thereby enhancing Cd phytoextraction. Planting C. argentea significantly decreased soil pathogenic microbes and increased the abundances of plant growth-promoting rhizobacteria (PGPR) and 1-aminocyclopropane-1-carboxylate (ACC) deaminase genes, which may be beneficial for the growth of S. plumbizincicola. Planting S. plumbizincicola increased the abundance of sulfur oxidization (SOX) system genes and decreased soil pH (p < 0.05), thereby increasing the Cd uptake by C. argentea. These findings indicated that rotation of C. argentea and S. plumbizincicola is a promising method for promoting Cd phytoextraction.
大多数超积累植物不能全年保持旺盛生长，这可能导致它们在几个月内的植物提取效率较低。在本研究中，提出了两种超积累植物的轮作来解决这个问题。进行了为期 18 个月的田间试验，以评估单一种植和轮作鸡冠花和松叶景天对 Cd 的植物提取效率。结果表明，与单一种植鸡冠花和松叶景天相比，轮作增加了 2.3 倍和 1.6 倍的 Cd 提取量。在轮作系统中，松叶景天的生物量和鸡冠花的 Cd 积累量分别增加了 54.4%和 40.7%。轮作减少了休耕时间，增加了收获频率，从而提高了 Cd 的植物提取效率。种植鸡冠花显著降低了土壤病原微生物的数量，增加了植物促生根际细菌（PGPR）和 1-氨基环丙烷-1-羧酸（ACC）脱氨酶基因的丰度，这可能有利于松叶景天的生长。种植松叶景天增加了硫氧化（SOX）系统基因的丰度，降低了土壤 pH 值（p<0.05），从而增加了鸡冠花对 Cd 的吸收。这些发现表明，鸡冠花和松叶景天的轮作是促进 Cd 植物提取的一种很有前途的方法。
