Vascular plant species response to warming and elevated carbon dioxide in a boreal peatland

McPartland, Mara Y.; Montgomery, Rebecca A.; Hanson, Paul J.; Phillips, Jana R.; Kolka, Randy; Palik, Brian

doi:10.1088/1748-9326/abc4fb

Title: Vascular plant species response to warming and elevated carbon dioxide in a boreal peatland

Journal Article · Thu Dec 17 00:00:00 EST 2020 · Environmental Research Letters

DOI:https://doi.org/10.1088/1748-9326/abc4fb· OSTI ID:1737728

; Montgomery, Rebecca A.; Hanson, Paul J.; Phillips, Jana R.; Kolka, Randy; Palik, Brian

Peatlands store a significant amount of terrestrial organic carbon in plant biomass and soils. The Spruce and Peatland Responses Under Changing Environments (SPRUCE) project is a warming and elevated carbon dioxide (eCO₂) experiment designed to test how the carbon sequestration and storage capacity of peatland ecosystems will respond to climate change. Here, we report changes in the vascular plant community that have occurred during the first five years of SPRUCE. We tracked species composition, diversity, and aboveground net primary production (ANPP) in chambers warmed at a wide range of temperatures (+0, +2.25, +4.5, +6.75, +9 °C), and two CO2 levels (~400 [ambient] and 900 parts per million). We observed an increase in aboveground vascular plant biomass accumulation, due primarily to an increase in shrub abundance. Overall species diversity decreased substantially, likely due in part to shading by increases in shrub density. The main driver of change in the vascular plant community was temperature, with minimal effects of CO₂ evident. These results indicate an overall increase in ANPP with warming, but highlight the importance of interactions between direct (warming) and indirect (competition) effects in determining how boreal peatlands will respond to climate change.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); U.S. Forest Service; Minnesota Agricultural Experiment Station

Grant/Contract Number:: AC05-00OR22725; PNW01‐JV11261952‐231

OSTI ID:: 1737728

Alternate ID(s):: OSTI ID: 1737494; OSTI ID: 1737731

Journal Information:: Environmental Research Letters, Journal Name: Environmental Research Letters Vol. 15 Journal Issue: 12; ISSN 1748-9326

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
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Title: Vascular plant species response to warming and elevated carbon dioxide in a boreal peatland

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