A5091143744- Polar Research and Ecology
- Climate change and permafrost
- Indigenous Studies and Ecology
- Respiratory and Cough-Related Research
- Anesthesia and Neurotoxicity Research
- Intensive Care Unit Cognitive Disorders
- Biomedical and Chemical Research
- Plant nutrient uptake and metabolism
- Neuroscience of respiration and sleep
- Asthma and respiratory diseases
- Plant-Microbe Interactions and Immunity
- Soil Carbon and Nitrogen Dynamics
- Cryospheric studies and observations
- German Literature and Culture Studies
- Public Administration and Political Analysis
- Genomics and Phylogenetic Studies
- Microbial Community Ecology and Physiology
- Medical and Health Sciences Research
- Legume Nitrogen Fixing Symbiosis
University of Vienna
2020-2024
Warming increases soil microbial respiration which leads to significant C loss. However, it has been shown that the initial increase in tends level off long term, sometimes even returning pre-warming levels. Two main hypotheses explain this short-lived thermal increase: (i) The concentration of substrate soils declines due increased activity, becoming a limiting factor and leading reduced overall respiration, or (ii) Microbial physiology adjusts higher temperatures improve fitness under new...
Physiological responses of soil microorganisms to global warming are important for ecosystem function and the terrestrial carbon cycle. Here, we investigate effects weeks, years, decades across seasons time on microbial protein biosynthesis machineries (i.e. ribosomes), most abundant cellular macromolecular complexes, using RNA:DNA RNA:MBC (microbial biomass carbon) ratios as proxies ribosome contents. We compared warmed soils non-warmed controls 15 replicated subarctic grassland forest...
Permafrost soils are particularly vulnerable to climate warming. With ~1,500 Gt Carbon (C), they store a significant proportion of global soil C. Organic matter that was frozen and thus unavailable for microbial decomposition millennia, is now thawing. How much this permafrost C decomposed will be determined by activities the partitioning assimilated growth (potential stabilization) or respiration (C loss). Our current knowledge on controls in is, however, limited. The...
Sugars and organic acids, primary components in plant root exudates, are thought to enhance microbial decomposition of matter the rhizosphere. However, their specific impacts on activity nutrient mobilisation remain poorly understood. Here, we simulated passive exudation investigate distinct effects sugars acids metabolism We released 13C-labelled and/or via reverse microdialysis into intact meadow forest soils over 6-hours. measured substrate-induced respiration, soil mineralization,...
The Arctic warms four times faster than the global average, resulting in widespread permafrost thaw. Organic matter that was stored permanently frozen soil for up to millennia now becomes available microbial decomposition. Warming might also alter community composition and physiology thus change decomposition potential of soils. Our current knowledge about organic (SOM) is limited, particularly regard heterogeneity landscapes, hampering our ability predict possible feedbacks climate change....
<p>Arctic ecosystems outpace the global rate of temperature increases and are exceptionally susceptible to warming. Concerns raising that CO<sub>2</sub> CH<sub>4</sub> released from thawing permafrost upon warming may induce a positive feedback climate change. This is based on assumption, microbial activity with does not acclimate over time. However, we lack mechanistic understanding carbon nutrient fluxes including their...
<p>Climate change threatens the Earth’s biggest terrestrial organic carbon reservoir: permafrost soils. With climate warming, frozen soil matter may thaw and become available for microbial decomposition subsequent greenhouse gas emissions. Permafrost soils are extremely heterogenous within profile between landforms. This heterogeneity in environmental conditions, content composition, potentially leads to different communities with responses warming. The aim of...