Thermohydrological Impact of Forest Disturbances on Ecosystem‐Protected Permafrost


Contact
simone.stuenzi [ at ] awi.de

Abstract

Boreal forests cover over half of the global permafrost area and protect underlying permafrost. Boreal forest development, therefore, has an impact on permafrost evolution, especially under a warming climate. Forest disturbances and changing climate conditions cause vegetation shifts and potentially destabilize the carbon stored within the vegetation and permafrost. Disturbed permafrost-forest ecosystems can develop into a dry or swampy bush- or grasslands, shift toward broadleaf- or evergreen needleleaf-dominated forests, or recover to the pre-disturbance state. An increase in the number and intensity of fires, as well as intensified logging activities, could lead to a partial or complete ecosystem and permafrost degradation. We study the impact of forest disturbances (logging, surface, and canopy fires) on the thermal and hydrological permafrost conditions and ecosystem resilience. We use a dynamic multilayer canopy-permafrost model to simulate different scenarios at a study site in eastern Siberia. We implement expected mortality, defoliation, and ground surface changes and analyze the interplay between forest recovery and permafrost. We find that forest loss induces soil drying of up to 44%, leading to lower active layer thicknesses and abrupt or steady decline of a larch forest, depending on disturbance intensity. Only after surface fires, the most common disturbances, inducing low mortality rates, forests can recover and overpass pre-disturbance leaf area index values. We find that the trajectory of larch forests after surface fires is dependent on the precipitation conditions in the years after the disturbance. Dryer years can drastically change the direction of the larch forest development within the studied period.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Helmholtz Cross Cutting Activity (2021-2027)
Peer revision
Peer-reviewed, Web of Science / Scopus
Publication Status
Published
Eprint ID
56099
DOI 10.1029/2021JG006630

Cite as
Stuenzi, S. M. , Kruse, S. , Boike, J. , Herzschuh, U. , Oehme, A. , Pestryakova, L. A. , Westermann, S. and Langer, M. (2022): Thermohydrological Impact of Forest Disturbances on Ecosystem‐Protected Permafrost , Journal of Geophysical Research: Biogeosciences, 127 (5) . doi: 10.1029/2021JG006630


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Arctic Land Expeditions > RU-Land_2018_Chukotka
Arctic Land Expeditions > RU-Land_2018_Yakutia
Arctic Land Expeditions > RU-Land_2019_Chukotka
Arctic Land Expeditions > RU-Land_2019_Nyurba

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info:eu-repo/grantAgreement/EC/H2020/772852


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