The impact of wildfire on microbial C:N:P stoichiometry and the fungal-to-bacterial ratio in permafrost soil

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Zhou , X , Sun , H , Pumpanen , J , Sietiö , O-M , Heinonsalo , J , Köster , K & Berninger , F 2019 , ' The impact of wildfire on microbial C:N:P stoichiometry and the fungal-to-bacterial ratio in permafrost soil ' , Biogeochemistry , vol. 142 , no. 1 , pp. 1-17 . https://doi.org/10.1007/s10533-018-0510-6

Title: The impact of wildfire on microbial C:N:P stoichiometry and the fungal-to-bacterial ratio in permafrost soil
Author: Zhou, Xuan; Sun, Hui; Pumpanen, Jukka; Sietiö, Outi-Maaria; Heinonsalo, Jussi; Köster, Kajar; Berninger, Frank
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, University of Eastern Finland, Department of Environmental and Biological Sciences
University of Helsinki, Department of Food and Nutrition
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
Date: 2019-01
Language: eng
Number of pages: 17
Belongs to series: Biogeochemistry
ISSN: 1573-515X
URI: http://hdl.handle.net/10138/297091
Abstract: Wildfires thaw near-surface permafrost soils in the boreal forest, making previously frozen organic matter available to microbes. The short-term microbial stoichiometric dynamics following a wildfire are critical to understanding the soil element variations in thawing permafrost. Thus, we selected a boreal wildfire chronosequence in a region of continuous permafrost, where the last wildfire occurred 3, 25, 46, and > 100 years ago (set as the control) to explore the impact of wildfire on the soil chemistry, soil microbial stoichiometry, and the fungal-to-bacterial gene ratio (F:B ratio). We observed the microbial biomass C:N:P ratio remained constant in distinct age classes indicating that microbes are homeostatic in relation to stoichiometric ratios. The microbial C:N ratios were independent of the shifts in the fungal-to-bacterial ratio when C:N exceeded 12. Wildfire-induced reduction in vegetation biomass positively affected the fungal, but not the bacterial, gene copy number. The decline in microbial biomass C, N, and P following a fire, primarily resulted from a lack of soil available C and nutrients. Wildfire affected neither the microbial biomass nor the F:B ratios at a soil depth of 30 cm. We conclude that microbial stoichiometry does not always respond to changes in the fungal-to-bacterial ratio and that wildfire-induced permafrost thawing does not accelerate microbial respiration.
Subject: Wildfire
Boreal forest
Permafrost
Microbial biomass
C:N:P stoichiometry
Homeostasis
Fungal-to-bacterial ratio
LITTER DECOMPOSITION
ORGANIC-MATTER
NITROGEN-FERTILIZATION
COMMUNITY COMPOSITION
FIRE CHRONOSEQUENCE
ENZYME-ACTIVITIES
BOREAL FORESTS
CLIMATE-CHANGE
BIOMASS
CARBON
4112 Forestry
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