Xiao Yongkang, He Jianxiao, Aishan Tayierjiang, Sui Xiaoqing, Zhou Yifan, Yimingniyazi Amanula
College of Grassland Sciences, Xinjiang Agricultural University, Urumqi 830052, China.
College of Ecology and Environment, Xinjiang University, Urumqi 830046, China.
Biology (Basel). 2023 Dec 26;13(1):14. doi: 10.3390/biology13010014.
Studying the effects of different degrees of exotic plant invasion on native plants' community structure and plant diversity is essential for evaluating the harm caused to ecosystems by plant invasion. In this study, we investigated the effects of , a widespread invasive species, on plant community species diversity and community stability in the Ili River Valley area of Xinjiang, China, under three invasion levels (no invasion and low, moderate, and heavy invasion), and the competitive advantage index, invasion intensity, and contribution of plant community species diversity to community stability and invasibility were determined for the prickly fungus under different degrees of invasion. The results show that there were significant differences ( < 0.05) in the species diversity and community stability of plant communities caused by different degrees of invasion of . The species diversity and stability of plant communities were negatively correlated with the community invasibility, competitive advantage, and invasion intensity of ( < 0.05); therefore, the competitive advantage and invasion intensity of increase with the increase of its invasion degree. On the contrary, community species diversity and stability decreased with the increase of its invasion degree, ultimately leading to differences in community invasibility under different invasion degrees. The Shannon-Wiener and Simpson's indices were the greatest contributors to community stability and invasibility, respectively. Moderate and heavy levels of invasion by reduced the diversity and stability of local plant communities, increased the invasibility of communities, and substantially affected the structures of plant communities. Therefore, the continued invasion by will have an immeasurable impact on the fragile ecosystems and diversity of indigenous species in Xinjiang. We recommend that this invasive species be controlled and eradicated at the early stages of invasion to prevent further harm.
研究不同程度的外来植物入侵对本地植物群落结构和植物多样性的影响，对于评估植物入侵对生态系统造成的危害至关重要。在本研究中，我们调查了一种广泛分布的入侵物种在三个入侵水平（无入侵、轻度、中度和重度入侵）下对中国新疆伊犁河谷地区植物群落物种多样性和群落稳定性的影响，并确定了该入侵物种在不同入侵程度下的竞争优势指数、入侵强度以及植物群落物种多样性对群落稳定性和可入侵性的贡献。结果表明，不同程度的该入侵物种入侵所导致的植物群落物种多样性和群落稳定性存在显著差异（<0.05）。植物群落的物种多样性和稳定性与该入侵物种的群落可入侵性、竞争优势和入侵强度呈负相关（<0.05）；因此，该入侵物种的竞争优势和入侵强度随其入侵程度的增加而增加。相反，群落物种多样性和稳定性随其入侵程度的增加而降低，最终导致不同入侵程度下群落可入侵性的差异。香农 - 维纳指数和辛普森指数分别对群落稳定性和可入侵性贡献最大。该入侵物种的中度和重度入侵降低了当地植物群落的多样性和稳定性，增加了群落的可入侵性，并对植物群落结构产生了重大影响。因此，该入侵物种的持续入侵将对新疆脆弱的生态系统和本土物种多样性产生不可估量的影响。我们建议在入侵早期对这种入侵物种进行控制和根除，以防止进一步的危害。
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