Institute of Environment and Ecology & School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, PR China.
Int J Phytoremediation. 2020;22(12):1295-1303. doi: 10.1080/15226514.2020.1765140. Epub 2020 May 19.
A variety of invasive alien species (IAS) can trigger distinct allelopathy on the seed germination and seedling growth (SGeSGr) of native plant species (NPS) mainly through the released allelochemicals. However, the decomposition process of IAS litters may affect their allelopathy on SGeSGr of NPS because part of the allelochemicals will be released during the litter decomposition process, especially under heavy metal pollution. This study focuses on the impacts of the litter decomposition process of the notorious IAS L. on its allelopathy on SGeSGr of NPS L. under cadmium (Cd) pollution. The decomposition process signally declines the allelopathy of litters on SGeSGr of likely because partial allelochemicals in litters discharged during the decomposition process. Cd addition noticeably rises the allelopathy of litters on SGeSGr of probably because Cd can reduce plant growth largely the improved lipid membrane permeability and the induced reactive oxygen molecules which is unfavorable to plant cell metabolism. This phenomenon may also be attributed to the weak acid properties of one of the most abundant allelochemicals in litters, , phenolics (particularly polyphenols), can improve the solubility and the toxicity of Cd.
多种入侵外来物种 (IAS) 可通过释放化感物质对本地植物物种 (NPS) 的种子萌发和幼苗生长 (SGeSGr) 产生显著的化感作用。然而，IAS 凋落物的分解过程可能会影响其对 NPS 的 SGeSGr 的化感作用，因为部分化感物质会在凋落物分解过程中释放出来，尤其是在重金属污染下。本研究集中于臭名昭著的 IAS 李属在镉 (Cd) 污染下对其对 NPS 李属 SGeSGr 化感作用的凋落物分解过程的影响。分解过程显著降低了凋落物对 SGeSGr 的化感作用，可能是因为凋落物在分解过程中排放出部分化感物质。Cd 添加显著提高了凋落物对 SGeSGr 的化感作用，可能是因为 Cd 会极大地降低植物生长，增加脂膜通透性和诱导活性氧分子，这不利于植物细胞代谢。这种现象也可能归因于凋落物中最丰富的化感物质之一的弱酸性特性，酚类（特别是多酚）可以提高 Cd 的溶解度和毒性。
