Universität zu Köln

Rindt, Oscar ORCID: 0000-0001-9870-4580, Rosinger, Christoph ORCID: 0000-0002-4973-3921, Bonkowski, Michael ORCID: 0000-0003-2656-1183, Rixen, Christian ORCID: 0000-0002-2486-9988, Brueggemann, Nicolas, Urich, Tim ORCID: 0000-0002-5718-1354 and Fiore-Donno, Anna Maria ORCID: 0000-0001-6265-1907 (2023). Biogeochemical dynamics during snowmelt and in summer in the Alps. Biogeochemistry, 162 (2). S. 257 - 267. DORDRECHT: SPRINGER. ISSN 1573-515X

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Abstract

In alpine zones, soil microbial biomass and activity are strongly dependent on the seasonal snow cover. Current models assume that microbial biomass reaches an annual peak in winter under the insulating snowpack with a subsequent sharp decline during snowmelt. In this study, we investigated the seasonal dynamics of the soil microbial biomass in the Central Alps, where usually early snowfall buffers winter soil temperatures. We conducted a large-scale survey in three mountains around Davos (Switzerland) along altitudinal gradients from approximately 1900 to 2800 m above sea level. Using a space-for-time approach during snowmelt, soil samples were taken (1) under, (2) at the edge of, and (3) one meter away from remaining snow patches. One additional sample per site was taken in summer to further evaluate the seasonal dynamics. In total, 184 soil samples from 46 different sites were analyzed. We measured microbial biomass C and N, enzymatic activity and dissolved C and N. We observed an increase of microbial biomass and dissolved C during and immediately after snowmelt, as well as an increase from spring to summer. We suggest that the absence of soil freezing in winter and the growing amounts of dissolved C supported a continued growth, without a sudden collapse of the microbial biomass. Our results underline the importance of the insulating effect of the seasonal snow cover for the microbial dynamics. Global warming is modifying the timing and abundance of the seasonal snow cover, and our results will help to refine models for the dynamics of soil microbes in alpine ecosystems.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rindt, Oscar UNSPECIFIED orcid.org/0000-0001-9870-4580 UNSPECIFIED Rosinger, Christoph UNSPECIFIED orcid.org/0000-0002-4973-3921 UNSPECIFIED Bonkowski, Michael UNSPECIFIED orcid.org/0000-0003-2656-1183 UNSPECIFIED Rixen, Christian UNSPECIFIED orcid.org/0000-0002-2486-9988 UNSPECIFIED Brueggemann, Nicolas UNSPECIFIED UNSPECIFIED UNSPECIFIED Urich, Tim UNSPECIFIED orcid.org/0000-0002-5718-1354 UNSPECIFIED Fiore-Donno, Anna Maria UNSPECIFIED orcid.org/0000-0001-6265-1907 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-685986
DOI:	10.1007/s10533-022-01005-8
Journal or Publication Title:	Biogeochemistry
Volume:	162
Number:	2
Page Range:	S. 257 - 267
Date:	2023
Publisher:	SPRINGER
Place of Publication:	DORDRECHT
ISSN:	1573-515X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MICROBIAL BIOMASS CALIBRATION; FUMIGATION-EXTRACTION METHOD; POPULATION DYNAMICS; INORGANIC NITROGEN; ORGANIC-CARBON; CLIMATE-CHANGE; DEEPENED SNOW; SOIL; NUTRIENT; AVAILABILITY Multiple languages Environmental Sciences; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68598