Divergent species-specific impacts of whole ecosystem warming and elevated CO2 on vegetation water relations in an ombrotrophic peatland
Abstract
Abstract Boreal peatland forests have relatively low species diversity and thus impacts of climate change on one or more dominant species could shift ecosystem function. Despite abundant soil water availability, shallowly rooted vascular plants within peatlands may not be able to meet foliar demand for water under drought or heat events that increase vapor pressure deficits while reducing near surface water availability, although concurrent increases in atmospheric CO 2 could buffer resultant hydraulic stress. We assessed plant water relations of co‐occurring shrub (primarily Rhododendron groenlandicum and Chamaedaphne calyculata ) and tree ( Picea mariana and Larix laricina ) species prior to, and in response to whole ecosystem warming (0 to +9°C) and elevated CO 2 using 12.8‐m diameter open‐top enclosures installed within an ombrotrophic bog. Water relations (water potential [Ψ], turgor loss point, foliar and root hydraulic conductivity) were assessed prior to treatment initiation, then Ψ and peak sap flow (trees only) assessed after 1 or 2 years of treatments. Under the higher temperature treatments, L. laricina Ψ exceeded its turgor loss point, increased its peak sap flow, and was not able to recover Ψ overnight. In contrast, P. mariana operated below its turgor loss point and maintained constant Ψ andmore »
- Authors:
-
[1];
[1];
[1];
[1]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Inst.
- Linnaeus University, Växjö (Sweden)
- U.S. Geological Survey (USGS), Lafayette, LA (United States). Wetland and Aquatic Research Center
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1779150
- Alternate Identifier(s):
- OSTI ID: 1783365
- Grant/Contract Number:
- AC05-00OR22725; DE‐AC05‐1008 00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Global Change Biology
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 9; Journal ID: ISSN 1354-1013
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; black spruce; boreal forest; climate change; hydraulic stress; sap flow; water potential
Citation Formats
Warren, Jeffrey M., Jensen, Anna M., Ward, Eric J., Guha, Anirban, Childs, Joanne, Wullschleger, Stan D., and Hanson, Paul J. Divergent species-specific impacts of whole ecosystem warming and elevated CO2 on vegetation water relations in an ombrotrophic peatland. United States: N. p., 2021.
Web. doi:10.1111/gcb.15543.
Warren, Jeffrey M., Jensen, Anna M., Ward, Eric J., Guha, Anirban, Childs, Joanne, Wullschleger, Stan D., & Hanson, Paul J. Divergent species-specific impacts of whole ecosystem warming and elevated CO2 on vegetation water relations in an ombrotrophic peatland. United States. https://doi.org/10.1111/gcb.15543
Warren, Jeffrey M., Jensen, Anna M., Ward, Eric J., Guha, Anirban, Childs, Joanne, Wullschleger, Stan D., and Hanson, Paul J. Mon .
"Divergent species-specific impacts of whole ecosystem warming and elevated CO2 on vegetation water relations in an ombrotrophic peatland". United States. https://doi.org/10.1111/gcb.15543. https://www.osti.gov/servlets/purl/1779150.
@article{osti_1779150,
title = {Divergent species-specific impacts of whole ecosystem warming and elevated CO2 on vegetation water relations in an ombrotrophic peatland},
author = {Warren, Jeffrey M. and Jensen, Anna M. and Ward, Eric J. and Guha, Anirban and Childs, Joanne and Wullschleger, Stan D. and Hanson, Paul J.},
abstractNote = {Abstract Boreal peatland forests have relatively low species diversity and thus impacts of climate change on one or more dominant species could shift ecosystem function. Despite abundant soil water availability, shallowly rooted vascular plants within peatlands may not be able to meet foliar demand for water under drought or heat events that increase vapor pressure deficits while reducing near surface water availability, although concurrent increases in atmospheric CO 2 could buffer resultant hydraulic stress. We assessed plant water relations of co‐occurring shrub (primarily Rhododendron groenlandicum and Chamaedaphne calyculata ) and tree ( Picea mariana and Larix laricina ) species prior to, and in response to whole ecosystem warming (0 to +9°C) and elevated CO 2 using 12.8‐m diameter open‐top enclosures installed within an ombrotrophic bog. Water relations (water potential [Ψ], turgor loss point, foliar and root hydraulic conductivity) were assessed prior to treatment initiation, then Ψ and peak sap flow (trees only) assessed after 1 or 2 years of treatments. Under the higher temperature treatments, L. laricina Ψ exceeded its turgor loss point, increased its peak sap flow, and was not able to recover Ψ overnight. In contrast, P. mariana operated below its turgor loss point and maintained constant Ψ and sap flow across warming treatments. Similarly, C. calyculata Ψ stress increased with temperature while R. groenlandicum Ψ remained at pretreatment levels. The more anisohydric behavior of L. laricina and C. calyculata may provide greater net C uptake with warming, while the more conservative P. mariana and R. groenlandicum maintained greater hydraulic safety. These latter species also responded to elevated CO 2 by reduced Ψ stress, which may also help limit hydraulic failure during periods of extreme drought or heat in the future. Along with Sphagnum moss, the species‐specific responses of peatland vascular communities to drier or hotter conditions will shape boreal peatland composition and function in the future.},
doi = {10.1111/gcb.15543},
journal = {Global Change Biology},
number = 9,
volume = 27,
place = {United States},
year = {Mon Feb 22 00:00:00 EST 2021},
month = {Mon Feb 22 00:00:00 EST 2021}
}
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