Department of Ecology, State Key Laboratory of Biocontrol and School of Life Sciences, Sun Yat-sen University.
Department of Ecology, State Key Laboratory of Biocontrol and School of Life Sciences, Sun Yat-sen University, .
Nat Commun. 2021 May 25;12(1):3137. doi: 10.1038/s41467-021-23236-3.
Arbuscular mycorrhizal (AM) and ectomycorrhizal (EcM) associations are critical for host-tree performance. However, how mycorrhizal associations correlate with the latitudinal tree beta-diversity remains untested. Using a global dataset of 45 forest plots representing 2,804,270 trees across 3840 species, we test how AM and EcM trees contribute to total beta-diversity and its components (turnover and nestedness) of all trees. We find AM rather than EcM trees predominantly contribute to decreasing total beta-diversity and turnover and increasing nestedness with increasing latitude, probably because wide distributions of EcM trees do not generate strong compositional differences among localities. Environmental variables, especially temperature and precipitation, are strongly correlated with beta-diversity patterns for both AM trees and all trees rather than EcM trees. Results support our hypotheses that latitudinal beta-diversity patterns and environmental effects on these patterns are highly dependent on mycorrhizal types. Our findings highlight the importance of AM-dominated forests for conserving global forest biodiversity.
丛枝菌根 (AM) 和外生菌根 (EcM) 共生体对宿主树的性能至关重要。然而，菌根共生体与纬度树种 β 多样性的相关性仍未得到检验。本研究使用了一个全球数据集，其中包括 45 个森林样地，代表了 3840 个物种的 2804270 棵树，检验了 AM 和 EcM 树种如何对所有树种的总 β 多样性及其组成部分（周转率和嵌套性）做出贡献。结果发现，AM 树种而不是 EcM 树种主要导致总 β 多样性、周转率降低，嵌套性增加，这可能是因为 EcM 树种的广泛分布不会在不同地点产生强烈的组成差异。环境变量，尤其是温度和降水，与 AM 树种和所有树种的 β 多样性模式密切相关，而与 EcM 树种无关。研究结果支持我们的假设，即纬度 β 多样性模式及其对这些模式的环境影响高度依赖于菌根类型。本研究结果强调了以 AM 为主导的森林对保护全球森林生物多样性的重要性。
