The Distribution of Soil Carbon and Nitrogen Stocks Among Dominant Geomorphological Terrain Units in Qarlikturvik Valley, Bylot Island, Arctic Canada

Ola, Anne; Fortier, Daniel; Coulombe, Stephanie; Comte, Jérôme; Dominé, Florent

doi:10.1029/2021jg006750

Cited by 2 publications

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“…Grellman, 2002; Van Wijk et al, 2003). However, it is uncertain if greater primary productivity would lead to aggradation and drying of the surface (Ola et al, 2022). Uplands are often well drained and characterized by epigenetic permafrost, in which case permafrost does not form by the aggradation of the base of the active layer (French, 2017).…”

Section: Discussionmentioning

confidence: 99%

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Increased nutrient availability speeds up permafrost development, while goose grazing slows it down in a Canadian High Arctic wetland

et al. 2022

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1. It is of prime importance to understand feedbacks due to the release of carbon (C) stored in permafrost soils (permafrost-climate feedback) and direct impacts of climatic variations on permafrost dynamics therefore received considerable attention. However, indirect effects of global change, such as the variation in soil nutrient availability and grazing pressure, can alter soil and surface properties of the Arctic tundra, with the potential to modify soil heat transfers toward the permafrost and impact resilience of Arctic ecosystems.2. We determined the potential of nutrient availability and grazing to alter soil energy balance using a 16-year split-plot experiment crossing fertilization at different doses of nitrogen (N) and phosphorus (P) with protection from goose grazing.Moss biomass and some determinants of the surface energy budget (leaf area index (LAI), dead vascular plant biomass and albedo) were quantified and active layer thaw depth repeatedly measured during three growing seasons. We measured soil physical properties and thermal conductivity and used a physical model to link topsoil organic accumulation processes to heat transfer.3. Fertilization increased LAI and albedo, whereas grazing decreased dead vascular plant biomass and albedo. Fertilization increased organic accumulation at the top of the soil leading to drier and more porous topsoil, whereas grazing increased water content of topsoil. As a result, topsoil thermal conductivity was higher in grazed plots than in ungrazed ones. Including these properties into a simulation model, we showed that, after 16 years, nutrient addition tended to shallow the active layer whereas grazing deepened mean July active layer by

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Section: Discussionmentioning

confidence: 99%

“…Grellman, 2002;Van Wijk et al, 2003). However, it is uncertain if greater primary productivity would lead to aggradation and drying of the surface (Ola et al, 2022).…”

Section: Thaw Depthmentioning

confidence: 99%

Increased nutrient availability speeds up permafrost development, while goose grazing slows it down in a Canadian High Arctic wetland

et al. 2022

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Hydrological Regime and Plant Functional Traits Jointly Mediate the Influence of Salix spp. on Soil Organic Carbon Stocks in a High Arctic Tundra

et al. 2023

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The Distribution of Soil Carbon and Nitrogen Stocks Among Dominant Geomorphological Terrain Units in Qarlikturvik Valley, Bylot Island, Arctic Canada

Abstract: Arctic regions store vast amounts of carbon (C) in their soils and are a crucial part of the global C cycle (e.g.,

Cited by 2 publications

References 90 publications

Increased nutrient availability speeds up permafrost development, while goose grazing slows it down in a Canadian High Arctic wetland

Increased nutrient availability speeds up permafrost development, while goose grazing slows it down in a Canadian High Arctic wetland

Hydrological Regime and Plant Functional Traits Jointly Mediate the Influence of Salix spp. on Soil Organic Carbon Stocks in a High Arctic Tundra

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