Xin Zhiming, Li Xing, Li Yonghua, Dong Xue, Duan Ruibing, Chang Xu, Cheng Yiben, Wu Xiuqing, Li Wei
School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China.
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou 015200, China.
Plants (Basel). 2024 Oct 4;13(19):2783. doi: 10.3390/plants13192783.
The Gobi Desert ecosystem is currently experiencing the impacts of persistent climate warming and extreme weather. However, the relative influences of factors such as soil, climate, and spatial variables on the β-diversity of desert plants and their key components have not been systematically studied. In this research, the Dunhuang North Mountain and Mazong Mountain areas were selected as study areas, with a total of 79 plant community plots systematically established. The aim was to explore intercommunity β-diversity and its components and to analyze the interrelationships with climate factors, soil factors, and geographic distance. The results indicate that (1) there is a geographic decay pattern and significant differences among plant communities in the Dunhuang North Mountain and Mazong Mountain areas, with β-diversity primarily driven by replacement components. (2) Climate, soil, and geographic distance significantly influence β-diversity and its replacement components, with climate factors exerting the greatest influence and geographic distance the least. (3) Multiple regression analysis (MRM) reveals differential effects of climate factors, soil factors, and geographic distance on β-diversity and its replacement components, with climate and soil factors exerting a much greater influence than geographic distance. In summary, the β-diversity of plant communities and their replacement components in the Dunhuang North Mountain and Mazong Mountain areas result from the combined effects of habitat filtering and dispersal limitation, with habitat filtering having a greater impact, while environmental heterogeneity is an important factor influencing species differences in this region.
戈壁沙漠生态系统目前正经历持续气候变暖和极端天气的影响。然而，土壤、气候和空间变量等因素对荒漠植物β多样性及其关键组成部分的相对影响尚未得到系统研究。本研究选取敦煌北山和马鬃山地区作为研究区域，系统建立了79个植物群落样地。目的是探讨群落间β多样性及其组成部分，并分析其与气候因素、土壤因素和地理距离的相互关系。结果表明：（1）敦煌北山和马鬃山地区植物群落存在地理衰减模式且差异显著，β多样性主要由替代组分驱动。（2）气候、土壤和地理距离对β多样性及其替代组分有显著影响，其中气候因素影响最大，地理距离影响最小。（3）多元回归分析（MRM）揭示了气候因素、土壤因素和地理距离对β多样性及其替代组分的不同影响，气候和土壤因素的影响远大于地理距离。综上所述，敦煌北山和马鬃山地区植物群落的β多样性及其替代组分是生境过滤和扩散限制共同作用的结果，生境过滤的影响更大，而环境异质性是影响该地区物种差异的重要因素。
