Tree mycorrhizal associations strongly mediate soil microbial β-diversity along an elevational gradient in a warm-temperate forest

IF 4.8 2区 农林科学 Q1 SOIL SCIENCE Applied Soil Ecology Pub Date : 2024-11-29 DOI:10.1016/j.apsoil.2024.105776
Xinyue Wang, Yaru Wang, Yu Wang, Jieyan Yang, Hongyi He, Yuchen Ren, Chenlin Wang, Haibo Li, Xiongzhi Zhang, Huifang Zhang, Jingjing Wang, Xiuqing Yang, Houjuan Song
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Abstract

Determining the factors influencing the elevational gradient of soil microbial diversity is a fundamental yet unresolved aspect of microbial ecology. Despite the considerable research on soil microbial β-diversity patterns across elevations, there has been limited attention given to the importance of symbiotic biotic relationships, e.g. tree mycorrhizal associations. Here, five-point samplings and metagenomic approaches were used to investigate the soil microbial β-diversity in 15 permanent forest sites (400 m2) along an elevational gradient ranging from 894 to 2219 m in Mt. Zhongtiao, a warm-temperate forest region in China. We also measured tree mycorrhizal associations characteristics, soil physiochemical characteristics, and plant diversity to gain a comprehensive understanding of the factors that influenced the microbial communities in this region. Our findings revealed an overall decreasing trend in the β-diversity of soil bacteria and fungi with increasing elevation, with tree mycorrhizal associations emerging as dominant explanatory factors for elevational patterns of microbial β-diversity. The decline in abundance of EcM (Ectomycorrhizal) tree species, the rise in the EcM/AM (Arbuscular mycorrhizal) ratio, and the overall basal area of EcM tree species emerged as the primary factors driving microbial β-diversity, and generally explained over 20 % variations of elevational microbial β-diversity. Importantly, the composition of tree species mycorrhizae influenced fungal β-diversity more than bacterial β-diversity (0.391 > 0.266). Furthermore, the influence of tree mycorrhizal associations on the elevational distribution of soil microbial communities was observed, either directly or indirectly mediated by soil physicochemical properties. The indirect effects of tree mycorrhizal composition on species β-diversity were both greater than the direct effects on bacteria (0.433 > 0.266) and fungi (0.391 > 0.245). These results underscore the importance of considering tree mycorrhizal associations in explaining variations in elevational patterns of soil microbial community structure, providing insights into the mechanisms driving these variations.
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在暖温带森林中,树木菌根关联沿海拔梯度强烈调节土壤微生物β-多样性
确定影响土壤微生物多样性高程梯度的因素是微生物生态学的一个基本但尚未解决的问题。尽管对不同海拔的土壤微生物β多样性模式进行了大量研究,但对共生关系的重要性的关注有限,例如树木菌根关联。本文采用5点采样和宏基因组学方法,对中国暖温带林区中条山海拔894 ~ 2219 m的15个400 m2永久森林立地土壤微生物β-多样性进行了研究。我们还测量了树木菌根关联特征、土壤理化特征和植物多样性,以全面了解影响该地区微生物群落的因素。结果表明,随着海拔的升高,土壤细菌和真菌的β-多样性总体呈下降趋势,而树木菌根关联是微生物β-多样性海拔格局的主要解释因素。外生菌根(EcM)树种丰度的下降、丛枝菌根(EcM/AM)比例的上升以及EcM树种的总体基底面积是驱动微生物β多样性的主要因素,可以解释海拔高度微生物β多样性超过20%的变化。重要的是,树木菌根组成对真菌β-多样性的影响大于细菌β-多样性(0.391 >;0.266)。此外,还观察了树木菌根结合力对土壤微生物群落海拔分布的影响,这种影响可能是由土壤理化性质直接或间接介导的。树木菌根组成对物种β-多样性的间接影响均大于对细菌的直接影响(0.433 >;0.266)和真菌(0.391 >;0.245)。这些结果强调了考虑树木菌根关联在解释土壤微生物群落结构海拔格局变化中的重要性,并提供了对驱动这些变化的机制的见解。
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来源期刊
Applied Soil Ecology
Applied Soil Ecology 农林科学-土壤科学
CiteScore
9.70
自引率
4.20%
发文量
363
审稿时长
5.3 months
期刊介绍: Applied Soil Ecology addresses the role of soil organisms and their interactions in relation to: sustainability and productivity, nutrient cycling and other soil processes, the maintenance of soil functions, the impact of human activities on soil ecosystems and bio(techno)logical control of soil-inhabiting pests, diseases and weeds.
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