Long-term mitigation of drought changes the functional potential and life-strategies of the forest soil microbiome involved in organic matter decomposition

Frontiers in Microbiology

Microbiology

Folker Meyer¹  Nina Buchmann²  Martin Hartmann³  Beat Frey⁴  Ivano Brunner⁴  Beat Stierli⁴  Claude Herzog⁵ 

[1] Data Science, Institute for AI in Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany;Argonne National Laboratory, Argonne, IL, United States;Computation Institute, University of Chicago, Chicago, IL, United States;Department of Medicine, University of Chicago, Chicago, IL, United States;Department of Environmental Systems Science, Grassland Sciences, Institute of Agricultural Sciences, ETH Zürich, Zürich, Switzerland;Department of Environmental Systems Science, Sustainable Agroecosystems, Institute of Agricultural Sciences, ETH Zürich, Zürich, Switzerland;Forest Soils and Biogeochemistry, Swiss Federal Research Institute WSL, Birmensdorf, Switzerland;Forest Soils and Biogeochemistry, Swiss Federal Research Institute WSL, Birmensdorf, Switzerland;Forest Soils and Biogeochemistry, Swiss Federal Research Institute WSL, Birmensdorf, Switzerland;Department of Environmental Systems Science, Grassland Sciences, Institute of Agricultural Sciences, ETH Zürich, Zürich, Switzerland;

关键词: climate change;    drought;    forest;    soil microbiome;    decomposition;    metagenomics;    metabarcoding;    stable isotope probing;   

DOI  :  10.3389/fmicb.2023.1267270

 received in 2023-07-26, accepted in 2023-09-14,  发布年份 2023

来源: Frontiers

【 摘 要 】

Climate change can alter the flow of nutrients and energy through terrestrial ecosystems. Using an inverse climate change field experiment in the central European Alps, we explored how long-term irrigation of a naturally drought-stressed pine forest altered the metabolic potential of the soil microbiome and its ability to decompose lignocellulolytic compounds as a critical ecosystem function. Drought mitigation by a decade of irrigation stimulated profound changes in the functional capacity encoded in the soil microbiome, revealing alterations in carbon and nitrogen metabolism as well as regulatory processes protecting microorganisms from starvation and desiccation. Despite the structural and functional shifts from oligotrophic to copiotrophic microbial lifestyles under irrigation and the observation that different microbial taxa were involved in the degradation of cellulose and lignin as determined by a time-series stable-isotope probing incubation experiment with 13C-labeled substrates, degradation rates of these compounds were not affected by different water availabilities. These findings provide new insights into the impact of precipitation changes on the soil microbiome and associated ecosystem functioning in a drought-prone pine forest and will help to improve our understanding of alterations in biogeochemical cycling under a changing climate.

【 授权许可】

Unknown   
Copyright © 2023 Hartmann, Herzog, Brunner, Stierli, Meyer, Buchmann and Frey.