Metabolic state of native microbiome influences soil respiration and Q10 in alpine and subalpine grasslands

Abstract ID: 3.10819
|Review Result Accepted as Talk
|Abstract registered Abstract is registered
|Presentation Time Slot TBA
|Presentation Location TBA
Nagler, M. (1,2)
Steinwandter, M. (1); Bahn, M. (3); and Seeber, J. (1,3)
(1) Eurac Research, Drususallee 1, 39100 Bozen, Italy
(2) Universität Innsbruck, Institut für Mikrobiologie, Technikerstraße 25, 6020 Innsbruck, Austria
(3) Universität Innsbruck, Institut für Ökologie, Sternwartestraße 15, 6020 Innsbruck, Austria
How to cite: Nagler, M.; Steinwandter, M.; Bahn, M.; and Seeber, J.: Metabolic state of native microbiome influences soil respiration and Q10 in alpine and subalpine grasslands, International Mountain Conference 2025, Innsbruck, Sep 14 - 18 2025, #IMC25-3.10819, 2025.
Categories: Biodiversity, Ecosystems
Keywords: Soil microbial communities, Soil respiration, Microbial activity, Soil fauna, intracellular eDNA
Categories: Biodiversity, Ecosystems
Keywords: Soil microbial communities, Soil respiration, Microbial activity, Soil fauna, intracellular eDNA
Abstract

Understanding soil respiration (SR) dynamics is essential for predicting climate change impacts on terrestrial carbon cycles. However, there is limited knowledge about how microbial community composition and metabolic state affect SR in mountainous areas, where environmental conditions are highly variable and warming occurs faster than in other regions. This study examines the relationship between SR and microbial (ITS- and 16S-based) gene copy numbers from intracellular DNA (iDNA) in alpine and subalpine grassland soils. By focusing on iDNA, we exclude non-organismic extracellular DNA and analyze DNA from intact cells, whether active or dormant. We calculate a gene-copy specific respiration rate (GSRR) and categorize microbial communities into different metabolic states. Our findings show a positive correlation between GSRR and Q10, with highly active microbial communities found at lower elevations with higher inclinations, more favorable pH, and C:N ratios. Additionally, greater soil fauna richness and diversity reduced microbial activity levels, while prokaryote richness and diversity were highest in the most active and most dormant communities. This study provides new insights into the relationships between microbial metabolic states and SR in alpine and subalpine grasslands, enhancing our understanding of these complex interactions and the effects of global warming on terrestrial carbon cycles.