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<p>Invasive plants have the potential to create microenvironmental conditions conducive to their further invasion via the decomposition process. The plant invasion may be influenced by the contamination of heavy metals via the regulation of the decomposition process. This study aimed to elucidate the effects of the mono- and co-decomposition of the leaves of the invasive plant <i>Amaranthus retroflexus</i> L. and the native plant <i>Amaranthus tricolor</i> L. on soil physicochemical properties, soil nutrient contents, soil enzyme activities, and soil bacterial communities treated with the mono- and co-contamination of copper (Cu) and lead (Pb). The leaves of <i>A. retroflexus</i> decomposed slower than those of <i>A. tricolor</i> without the mono- and co-contamination of Cu and Pb. The decomposition rate of the leaves of the two <i>Amaranthus</i> plants exhibited a decline with an increase in the invasion degree of <i>A. retroflexus</i> without the mono- and co-contamination of Cu and Pb. The mono- and co-contamination of Cu and Pb created a negative effect on the decomposition rate of the leaves of <i>A. tricolor</i>, but posed a positive effect on the decomposition rate of the leaves of <i>A. retroflexus</i>. The stress intensity of the mono- and co-contamination of Cu and Pb on the decomposition rate of the leaves of the two <i>Amaranthus</i> plants decreased with increase in the invasion degree of <i>A. retroflexus</i>. Thus, the mono- and co-contamination of Cu and Pb may facilitate the decomposition process of <i>A. retroflexus</i> via the delay in the decomposition rate of <i>A. tricolor</i>. Accordingly, the mono- and co-contamination of Cu and Pb may facilitate the invasion process of <i>A. retroflexus</i> with regard to the nutrient cycling mediated by the decomposition process.</p>

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Mono- and Co-contamination of Cu and Pb may facilitate plant invasion by slowing the decomposition of native plant litter

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Yingsheng Liu,
  • Yizhuo Du,
  • Chuang Li,
  • Yue Li,
  • Congyan Wang,
  • Jun Liu,
  • Huanshi Zhang,
  • Daolin Du

摘要

Invasive plants have the potential to create microenvironmental conditions conducive to their further invasion via the decomposition process. The plant invasion may be influenced by the contamination of heavy metals via the regulation of the decomposition process. This study aimed to elucidate the effects of the mono- and co-decomposition of the leaves of the invasive plant Amaranthus retroflexus L. and the native plant Amaranthus tricolor L. on soil physicochemical properties, soil nutrient contents, soil enzyme activities, and soil bacterial communities treated with the mono- and co-contamination of copper (Cu) and lead (Pb). The leaves of A. retroflexus decomposed slower than those of A. tricolor without the mono- and co-contamination of Cu and Pb. The decomposition rate of the leaves of the two Amaranthus plants exhibited a decline with an increase in the invasion degree of A. retroflexus without the mono- and co-contamination of Cu and Pb. The mono- and co-contamination of Cu and Pb created a negative effect on the decomposition rate of the leaves of A. tricolor, but posed a positive effect on the decomposition rate of the leaves of A. retroflexus. The stress intensity of the mono- and co-contamination of Cu and Pb on the decomposition rate of the leaves of the two Amaranthus plants decreased with increase in the invasion degree of A. retroflexus. Thus, the mono- and co-contamination of Cu and Pb may facilitate the decomposition process of A. retroflexus via the delay in the decomposition rate of A. tricolor. Accordingly, the mono- and co-contamination of Cu and Pb may facilitate the invasion process of A. retroflexus with regard to the nutrient cycling mediated by the decomposition process.