Wang Yuchao, Xue Wenyan, Lyu Jinlin, Yue Ming, Mao Zhuxin, Shen Xuejian, Wang Xue, Li Yang, Li Qian
Xi'an Botanical Garden of Shaanxi Province (Institute of Botany of Shaanxi Province), Xi'an 710061, China.
Shaanxi Engineering Research Centre for Conservation and Utilization of Botanical Resources, Xi'an 710061, China.
Microorganisms. 2024 Sep 28;12(10):1972. doi: 10.3390/microorganisms12101972.
Invasive plants have already been observed in the understory of mountain forests, which are often considered a safe shelter for most native plants. Microorganisms might be drivers of plant invasions. Nevertheless, the mechanisms determining variations in microbial community composition (beta diversity) during invasion along altitudinal gradients remain to be elucidated. Here, the elevational patterns and the driving ecological processes (e.g., environmental filtering, co-occurrence patterns, and community assembly processes) of soil bacterial beta diversity were compared between invasive and native plants on the Qinling Mountains. The species turnover dominated bacterial compositional dissimilarities in both invasive and native communities, and its contribution to total beta diversity decreased during invasion. Total soil bacterial dissimilarities and turnover exhibited significant binominal patterns over an altitudinal gradient, with a tipping point of 1413 m. Further analysis showed that the contributions of assembly processes decreased in parallel with an increase in contributions of co-occurrence patterns during the invasion process, indicating that species interdependence rather than niche partitioning is strongly correlated with the bacterial biogeography of invasive communities. Plant invasion affects the relative contributions of stochastic processes and co-occurrence interactions through the regulation of the physiochemical characteristics of soil, and ultimately determines compositional dissimilarities and the components of the bacterial community along altitudinal gradients.
在山林林下植被中已经观察到入侵植物，而山林林下植被通常被认为是大多数本地植物的安全庇护所。微生物可能是植物入侵的驱动因素。然而，在沿海拔梯度的入侵过程中，决定微生物群落组成变化（β多样性）的机制仍有待阐明。在此，比较了秦岭上入侵植物和本地植物之间土壤细菌β多样性的海拔格局和驱动生态过程（如环境过滤、共现模式和群落构建过程）。物种周转主导了入侵群落和本地群落中细菌组成的差异，并且在入侵过程中其对总β多样性的贡献降低。土壤细菌的总差异和周转在海拔梯度上呈现出显著的二项式模式，转折点为1413米。进一步分析表明，在入侵过程中，构建过程的贡献随着共现模式贡献的增加而平行下降，这表明物种间的相互依存而非生态位分化与入侵群落的细菌生物地理学密切相关。植物入侵通过调节土壤的理化特性影响随机过程和共现相互作用的相对贡献，并最终决定沿海拔梯度的细菌群落组成差异和成分。
