Zhu Lijun, Wang Jie, Liu Houji, Zhai Juntuan, Li Zhijun
Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Alar 843300, China.
College of Life Science and Technology, Tarim University, Research Center of Populus Euphratica, Alar 843300, China.
Plants (Basel). 2024 Nov 22;13(23):3283. doi: 10.3390/plants13233283.
is a key community-building species in the desert riparian forests of Northwest China, exhibiting exceptional resistance to stress and playing a vital role in soil and water conservation as well as maintaining ecological balance in arid regions. To investigate the ecological processes underlying the composition of communities and to identify their community construction mechanisms, this study analyses the species diversity and phylogenetic diversity of 58 communities, exploring their assembly processes and key influencing factors. This research aims to elucidate the relationship between community structure from the perspective of species evolution and analyse the construction mechanisms of communities across different clusters in arid environments. The results show that the species diversity of clusters in Northwest China is relatively low, and a significant correlation is noted with phylogenetic diversity (PD). The Shannon-Wiener and Margalef indices exhibit similar trends, whereas Simpson's index show the opposite trends. Pielou's index range from 0.7 to 0.85. Notably, the PD and species diversity of the - association group (Group 4) is significantly higher ( < 0.05) compared to that of the other groups. Additionally, net relatedness index (NRI) and nearest taxon index (NTI) peaked in the - association group (Group 4) and the -- association group (Group 1) ( < 0.05). A Pearson correlation analysis indicated that PD was significantly positively correlated with Margalef's index, Shannon-Wiener's index, and Pielou's index, but was significantly negatively correlated with Simpson's index, while also being associated with environmental factors. Key factors influencing the diversity of communities in Northwest China include total phosphorus, pH, soil moisture content, total potassium, the mean temperature of the coldest quarter, precipitation of the wettest month, and precipitation seasonality. Soil factors primarily affected the Pielou and Simpson indices of species diversity, whereas climatic factors mainly influenced the Margalef and Shannon-Wiener indices. PD and structure were mainly influenced by climatic factors. The combined effects of soil and climatic factors play a crucial role in sustaining the diversity and ecological adaptation of these plant communities. In summary, communities may exhibit a significant ecological niche conservation in response to environmental changes, and competitive exclusion might be the primary process shaping community structure. Climatic factors were shown to be important regulators of community diversity and phylogenetic structure.
是中国西北荒漠河岸林关键的群落构建物种，对胁迫具有极强抗性，在水土保持以及维持干旱地区生态平衡方面发挥着至关重要的作用。为探究群落组成背后的生态过程并确定其群落构建机制，本研究分析了58个群落的物种多样性和系统发育多样性，探讨其组装过程及关键影响因素。本研究旨在从物种进化角度阐明群落结构之间的关系，并分析干旱环境中不同聚类的群落构建机制。结果表明，中国西北聚类的物种多样性相对较低，且与系统发育多样性（PD）存在显著相关性。香农 - 维纳指数和马加利夫指数呈现相似趋势，而辛普森指数呈现相反趋势。皮洛指数范围为0.7至0.85。值得注意的是，- 关联组（第4组）的PD和物种多样性显著高于其他组（<0.05）。此外，净亲缘关系指数（NRI）和最近类群指数（NTI）在- 关联组（第4组）和-- 关联组（第1组）达到峰值（<0.05）。皮尔逊相关性分析表明，PD与马加利夫指数、香农 - 维纳指数和皮洛指数显著正相关，但与辛普森指数显著负相关，同时还与环境因素有关。影响中国西北群落多样性的关键因素包括总磷、pH值、土壤含水量、全钾、最冷月平均温度、最湿月降水量和降水季节性。土壤因素主要影响物种多样性的皮洛指数和辛普森指数，而气候因素主要影响马加利夫指数和香农 - 维纳指数。PD和结构主要受气候因素影响。土壤和气候因素的综合作用在维持这些植物群落的多样性和生态适应性方面起着关键作用。总之，群落可能会因环境变化而表现出显著的生态位保守性，竞争排斥可能是塑造群落结构的主要过程。气候因素被证明是群落多样性和系统发育结构的重要调节因子。
