Wu Hao, Ding Jianqing
College of Life Sciences, Xinyang Normal University, Xinyang, China.
School of Life Sciences, Henan University, Kaifeng, China.
Front Plant Sci. 2020 Aug 25;11:1306. doi: 10.3389/fpls.2020.01306. eCollection 2020.
Rapid global environmental changes could exacerbate the impacts of invasive plants on indigenous plant diversity, especially for freshwater ecosystems characterized by relatively simple plant community structures with low bioresistance. However, the abiotic and biotic determinants of plant diversity in aquatic invaded habitats remain unclear. In this study, we measured four -species diversity indices (the Patrick richness index, Shannon-Wiener diversity index, Simpson diversity index, and Pielou evenness index) in aquatic plant communities invaded by in southern China. We also recorded eight environmental parameters of these communities (longitude, latitude, elevation, dissolved oxygen, water conductivity, nitrate nitrogen, temperature, and precipitation), together with nine biotic traits of [abundance, invasion cover, height, total carbon (C) content of the leaves and stems, total nitrogen (N) content of the leaves and stems, and the C:N ratio of leaves and stems]. We then used regression analysis and redundancy analysis (RDA) to determine the dominant factors related to plant diversity. We found that the environment significantly affected abundance, height, coverage, stem carbon, and tissue nitrogen, while the leaf C:N stoichiometric ratio was relatively stable. Increasing longitude significantly increased plant diversity, while elevated dissolved oxygen and precipitation slightly improved plant diversity, but increased elevation caused negative effects. invasion significantly decreased all four diversity indices. Increases in coverage and leaf C:N strongly decreased plant diversity, and increased abundance slightly decreased diversity. Our study indicates that both the changing water environment and the properties of the aquatic invasive plants could have significant impacts on plant diversity. Thus, more attention should be paid to aquatic invasion assessment in lower longitudinal regions with lower native hydrophyte diversity.
全球环境的快速变化可能会加剧入侵植物对本土植物多样性的影响，尤其是对于植物群落结构相对简单、生物抗性较低的淡水生态系统而言。然而，水生入侵生境中植物多样性的非生物和生物决定因素仍不明确。在本研究中，我们测量了中国南方被入侵的水生植物群落中的四个物种多样性指数（帕特里克丰富度指数、香农 - 维纳多样性指数、辛普森多样性指数和皮洛均匀度指数）。我们还记录了这些群落的八个环境参数（经度、纬度、海拔、溶解氧、水电导率、硝态氮、温度和降水量），以及入侵植物的九个生物特征[丰度、入侵覆盖度、高度、叶和茎中的总碳（C）含量、叶和茎中的总氮（N）含量以及叶和茎中的C:N比]。然后，我们使用回归分析和冗余分析（RDA）来确定与植物多样性相关的主导因素。我们发现，环境显著影响入侵植物的丰度、高度、覆盖度、茎碳和组织氮，而叶C:N化学计量比相对稳定。经度增加显著增加植物多样性，而溶解氧和降水量升高略微改善植物多样性，但海拔升高会产生负面影响。入侵显著降低了所有四个多样性指数。入侵植物覆盖度和叶C:N的增加强烈降低植物多样性，而丰度增加略微降低多样性。我们的研究表明，变化的水环境和水生入侵植物的特性都可能对植物多样性产生重大影响。因此，对于本土水生植物多样性较低的低经度地区的水生入侵评估应给予更多关注。
