a School of Life Sciences , Nanjing University , Nanjing , China.
Int J Phytoremediation. 2019;21(2):84-91. doi: 10.1080/15226514.2016.1183574. Epub 2019 Jan 18.
Salix species are widely used as vegetation filters because of their flourishing root system and fast growth rate. However, studies have yet to determine whether the root system functions in vegetable filters with mixed heavy metal (HM) pollution or whether initial cutting participates in the phytoextraction of HMs. This study aims to determine the function of the root system and initial cutting as vegetation filters in the absorption and accumulation of Cd and Cu. Thick (>1 cm in diameter) and fine (<1 cm in diameter) initial cuttings of Salix matsudana were planted in a nutrient solution with single and mixed (Cd + Cu) treatments. The roots of several initial cuttings were removed daily to eradicate rhizofiltration. Results revealed that the existence of the root system altered distribution and interaction of Cd and Cu in plant organs and enhanced tolerance and phytoextraction capacity of plants. The initial cuttings could also absorb and accumulate HMs in the early growth stages of willow without roots. Cu inhibited the plant absorption and accumulation of Cd and promoted Cd transport to shoots. Cd inhibited the Cu absorption of the root system. Our study provided essential data regarding woody species as vegetation filters of HM pollution.
柳树品种因其茂盛的根系和快速的生长速度而被广泛用作植被过滤器。然而，目前还没有研究确定柳树的根系在混合重金属（HM）污染的植被过滤器中是否具有功能，或者初始切割是否参与了重金属的植物提取。本研究旨在确定柳树根系和初始切割作为植被过滤器在吸收和积累 Cd 和 Cu 方面的功能。粗（直径>1 厘米）和细（直径<1 厘米）的柳树 Matsudana 初始切割被种植在含有单一和混合（Cd+Cu）处理的营养液中。每天去除部分初始切割的根系以消除根际过滤。结果表明，根系的存在改变了 Cd 和 Cu 在植物器官中的分布和相互作用，增强了植物的耐受性和植物提取能力。没有根系的柳树在早期生长阶段也可以吸收和积累重金属。Cu 抑制了植物对 Cd 的吸收和积累，并促进了 Cd 向地上部分的运输。Cd 抑制了根系对 Cu 的吸收。我们的研究为木本物种作为 HM 污染的植被过滤器提供了重要的数据。
