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Microbial communities and activities in alpine and subalpine soils
Rosa Margesin1, Melanie Jud, Dagmar Tscherko
1Institute of Microbiology, University of Innsbruck, Innsbruck, Austria. rosa.margesin@uibk.ac.at
FEMS Microbiology Ecology
|December 4, 2008
Summary
Alpine soils exhibit distinct microbial communities adapted to cold, with higher proportions of psychrophilic bacteria and fungi compared to subalpine soils. Microbial activity, while decreasing with altitude, shows better cold adaptation in alpine environments.
Area of Science:
- Environmental Science
- Microbiology
- Soil Science
Background:
- Subalpine and alpine ecosystems present contrasting environmental conditions.
- Understanding soil microbial community shifts with altitude is crucial for ecological studies.
Purpose of the Study:
- To investigate soil properties, microbial activity, and community composition along an altitudinal gradient in the Austrian Alps.
- To compare cold adaptation strategies of soil microorganisms between subalpine and alpine zones.
Main Methods:
- Soil sampling across south and north slopes at subalpine and alpine altitudes.
- Analysis of physical and chemical soil properties.
- Assessment of microbial activity using soil dehydrogenase activity.
- Investigation of microbial communities via culture-dependent and culture-independent methods (PLFA, FISH).
Main Results:
- Alpine soils showed significantly colder conditions (lower temperatures, more frost) than subalpine soils.
- Soil dehydrogenase activity decreased with altitude but demonstrated enhanced cold adaptation in alpine soils.
- Increasing altitude led to a significant rise in culturable psychrophilic heterotrophic bacteria, fungi, and Gram-negative bacteria.
Conclusions:
- Soil microbial communities shift significantly with increasing altitude in alpine regions.
- Alpine soil microorganisms display adaptations to colder climates, influencing community structure and activity.
- Altitudinal gradients are key drivers of soil microbial diversity and function in mountain ecosystems.
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