Zhao Peng-Yu, Li Cui, Chai Bao-Feng
Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China.
Department of Environment and Economics, Shanxi University of Finance and Economics, Taiyuan 030006, China.
Huan Jing Ke Xue. 2018 Aug 8;39(8):3876-3884. doi: 10.13227/j.hjkx.201712148.
The community assembly process, which purports that the trade-off between the stochastic process and the deterministic process, is the central issue of community ecology, and is one of the most controversial ecological issues. The current research investigated the fungal community in the forests of the Guandi Mountains and elucidated the relative role of the stochastic and deterministic processes in the assembly of soil fungal community on a local scale. The correlation analysis and redundancy analysis of the physicochemical factors in soil and dominant fungal phyla, as well as the structural equation model analysis, showed that these physicochemical factors and aboveground vegetation diversity had significant effects on fungal communities. The direct effect of vegetation diversity on fungal community structure was the most (1.1858). It is inferred that the determination process (environmental selection) has a certain influence on the assembly of fungal communities. The -diversity of fungal community shows a distance-decay pattern; thus, it can be concluded that the stochastic process (dispersal limitation) has a certain effect on the assembly of fungal communities. Null model analysis confirmed that the deterministic process was the main driving factor for the assembly of the fungal communities in the study area, and their relative importance varied along with altitudinal gradient. The null deviations in the study area were negative, suggesting that habitat filtering was the driving factor of the assembly of fungal communities. Overall, the deterministic versus stochastic processes jointly drive the assembly of fungal communities in the study area, while the deterministic processes triumph.
群落构建过程，即随机过程与确定性过程之间的权衡，是群落生态学的核心问题，也是最具争议的生态学问题之一。当前的研究调查了关帝山森林中的真菌群落，并阐明了随机过程和确定性过程在局部尺度土壤真菌群落构建中的相对作用。对土壤理化因子与优势真菌门类进行的相关性分析和冗余分析，以及结构方程模型分析表明，这些理化因子和地上植被多样性对真菌群落有显著影响。植被多样性对真菌群落结构的直接影响最大（1.1858）。由此推断，确定性过程（环境选择）对真菌群落的构建有一定影响。真菌群落的多样性呈现距离衰减模式；因此，可以得出结论，随机过程（扩散限制）对真菌群落的构建有一定作用。空模型分析证实，确定性过程是研究区域真菌群落构建的主要驱动因素，其相对重要性随海拔梯度而变化。研究区域的空偏差为负，表明生境过滤是真菌群落构建的驱动因素。总体而言，确定性过程与随机过程共同驱动研究区域真菌群落的构建，而确定性过程占主导地位。
