Ectomycorrhizal fungus-associated determinants jointly reflect ecological processes in a temperature broad-leaved mixed forest
Ectomycorrhizal fungus-associated determinants jointly reflect ecological processes in a temperature broad-leaved mixed forest
复制标题
外生菌根真菌相关决定因素共同反映了温度阔叶混交林的生态过程
DOI：
10.1016/j.scitotenv.2019.135475
复制
发表时间：
2020-02-10
影响因子：
9.8
通讯作者：
Yuan, Hai-Sheng
中科院分区：
文献类型：
--
作者：
Bai, Zhen;Yuan, Zuo-Qiang;Yuan, Hai-Sheng
外生菌根(ECM)真菌与植被组成、土壤性质和特定地点的过程密切相关。然而，在生物适应和非生物变异的背景下，植物区系和ECM真菌组成的空间分布的共同进化机制仍然不清楚。我们结合了总共25个与ECM真菌相关的环境变量，施加了三种类型的综合得分，然后在一个25公顷(2)的森林样地中，在122个网格(20m×20m)上量化了地理位置、土壤化学性质和植被功能特征的环境梯度。在上述环境梯度上，植被真菌和ECM真菌的丰度和组成存在显著差异。具体地说，东北和西南部的植物区系分布存在差异(如白桦和曼陀罗)，并且与营养和水分梯度密切相关(西部水平高，铸型水平低)。此外，低营养低水分环境中ECM真菌群落的丰富度高于高营养高水分环境中的ECM真菌群落，东北与西南部之间中等坡度的混交林具有最高的ECM真菌多样性。这些发现表明，可预测的立地内植被演替与ECM相关的决定因素和土壤性质在局部尺度上的自然空间异质性密切相关。(C)2019爱思唯尔B.V.保留所有权利。
Ectomycorrhizal (ECM) fungi are closely related to vegetation compositions, edaphic properties, and site-specific processes. However, the coevolutionary mechanisms underlying the spatial distributions in floristic and ECM fungal composition in the context of biotic adaptations and abiotic variances remain unclear. We combine a total of 25 ECM fungus-associated environmental variables to impose three types of composite scores and then quantify the environmental gradients of geographical site, soil chemical property and vegetation functional trait across 122 grids of 20 m x 20 m in a 25-hm(2) forest plot. Significant dissimilarities in vegetational and ECM fungal abundance and composition existed along the above environmental gradients. Specifically, a contrasting floristic distribution (e.g., Befula platyphylla vs. Tilia mandshurica) existed between the northeastern and southwestern areas and was closely related to the nutrient and moisture gradients (with high levels in the west and low levels in the cast). Furthermore, the ECM fungal communities were more abundant in the nutrient-poor and low-moisture environments than in the nutrient-rich and high-moisture environments, and the mixed-forest in the middle-gradient sites between the northeastern and southwestern areas harbored the highest ECM fungal diversity. These findings suggest that predictable within-site vegetation succession is closely related to ECM-associated determinants and the natural spatial heterogeneity of edaphic properties at a local scale. (C) 2019 Elsevier B.V. All rights reserved.