Active layer depth and soil properties impact specific leaf area variation and ecosystem productivity in a boreal forest

Anderson, Carolyn G.; Bond-Lamberty, Ben; Stegen, James C.

doi:10.1371/journal.pone.0232506

Title: Active layer depth and soil properties impact specific leaf area variation and ecosystem productivity in a boreal forest

Journal Article · Thu Dec 31 00:00:00 EST 2020 · PLoS ONE

DOI:https://doi.org/10.1371/journal.pone.0232506· OSTI ID:1760317

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Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Massachusetts, Amherst, MA (United States)
Pacific Northwest National Lab. (PNNL), College Park, MD (United States). Joint Global Change Research Inst.
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Specific leaf area (SLA, leaf area per unit dry mass) is a key canopy structural characteristic, a measure of photosynthetic capacity, and an important input into many terrestrial process models. Although many studies have examined SLA variation, relatively few data exist from high latitude, climate-sensitive permafrost regions. We measured SLA and soil and topographic properties across a boreal forest permafrost transition, in which dominant tree species changed as permafrost deepened from 54 to >150 cm over 75 m hillslope transects in Caribou-Poker Creeks Research Watershed, Alaska. We characterized both linear and threshold relationships between topographic and edaphic variables and SLA and developed a conceptual model of these relationships. We found that the depth of the soil active layer above permafrost was significantly and positively correlated with SLA for both coniferous and deciduous boreal tree species. Intraspecific SLA variation was associated with a fivefold increase in net primary production, suggesting that changes in active layer depth due to permafrost thaw could strongly influence ecosystem productivity. While this is an exploratory study to begin understanding SLA variation in a non-contiguous permafrost system, our results indicate the need for more extensive evaluation across larger spatial domains. These empirical relationships and associated uncertainty can be incorporated into ecosystem models that use dynamic traits, improving our ability to predict ecosystem-level carbon cycling responses to ongoing climate change.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1760317

Report Number(s):: PNNL-SA-120124

Journal Information:: PLoS ONE, Vol. 15, Issue 12; ISSN 1932-6203

Publisher:: Public Library of ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Active layer depth and soil properties impact specific leaf area variation and ecosystem productivity in a boreal forest

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