Environment and microbiome drive different microbial traits and functions in the macroscale soil organic carbon cycle

文献类型： 外文期刊

第一作者： Wasner, Daniel

作者： Wasner, Daniel;Doetterl, Sebastian;Schnecker, Joerg;Han, Xingguo;Frossard, Aline;Sun, Yifei;Venegas, Erick Zagal;Boeckx, Pascal

作者机构：

关键词： carbon use efficiency; extracellular enzymes; microbial community composition; microbial functions; microbial growth; microbial metabolism; microbial respiration; microbial traits; soil organic carbon

期刊名称：GLOBAL CHANGE BIOLOGY （ 影响因子：12.0； 五年影响因子：14.0 ）

ISSN： 1354-1013

年卷期： 2024 年 30 卷 8 期

页码：

收录情况： SCI

摘要： Soil microbial traits and functions play a central role in soil organic carbon (SOC) dynamics. However, at the macroscale (regional to global) it is still unresolved whether (i) specific environmental attributes (e.g., climate, geology, soil types) or (ii) microbial community composition drive key microbial traits and functions directly. To address this knowledge gap, we used 33 grassland topsoils (0-10 cm) from a geoclimatic gradient in Chile. First, we incubated the soils for 1 week in favorable standardized conditions and quantified a wide range of soil microbial traits and functions such as microbial biomass carbon (MBC), enzyme kinetics, microbial respiration, growth rates as well as carbon use efficiency (CUE). Second, we characterized climatic and physicochemical properties as well as bacterial and fungal community composition of the soils. We then applied regression analysis to investigate how strongly the measured microbial traits and functions were linked with the environmental setting versus microbial community composition. We show that environmental attributes (predominantly the amount of soil organic matter) determined patterns of MBC along the gradient, which in turn explained microbial respiration and growth rates. However, respiration and growth normalized for MBC (i.e., specific respiration and growth) were more linked to microbial community composition than environmental attributes. Notably, both specific respiration and growth followed distinct trends and were related to different parts of the microbial community, which in turn resulted in strong effects on microbial CUE. We conclude that even at the macroscale, CUE is the result of physiologically decoupled aspects of microbial metabolism, which in turn is partially determined by microbial community composition. The environmental setting and microbial community composition affect different microbial traits and functions, and therefore both factors need to be considered in the context of macroscale SOC dynamics. Soil microbial traits and functions are central for soil organic carbon (SOC) dynamics. However, at regional to global scales it is still unresolved whether the environment (climate, geology, soil types) or microbial community composition drive key microbial traits and functions directly. Using 33 soils from a temperate grassland gradient, we show that the environment determined the biomass and absolute respiration and growth of microbes. However, microbial carbon use efficiency was best explained by microbial community composition. The environment and the microbiome affect different microbial traits and functions, and therefore both factors need to be considered in macroscale SOC dynamics.image

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