Skip to main content
U.S. flag

An official website of the United States government

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

Journal Article
Year of Publication
2020
Author
Keywords
Journal
Environmental Research Letters
Volume
15
Issue
12
Number of Pages
124066
Publisher
ISSN Number
1748-9326
Abstract
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.
DOI
10.1088/1748-9326/abc4fb

mnspruce.ornl.gov

An official website of the U.S. Department of Energy and the USDA Forest Service

Looking for U.S. government information and services?
Visit USA.gov