Biophysical drivers of seasonal variability in Sphagnum gross primary production in a northern temperate bog
Abstract
Abstract Sphagnum mosses are the keystone species of peatland ecosystems. With rapid rates of climate change occurring in high latitudes, vast reservoirs of carbon accumulated over millennia in peatland ecosystems are potentially vulnerable to rising temperature and changing precipitation. We investigate the seasonal drivers of Sphagnum gross primary production (GPP)—the entry point of carbon into wetland ecosystems. Continuous flux measurements and flux partitioning show a seasonal cycle of Sphagnum GPP that peaked in the late summer, well after the peak in photosynthetically active radiation. Wavelet analysis showed that water table height was the key driver of weekly variation in Sphagnum GPP in the early summer and that temperature was the primary driver of GPP in the late summer and autumn. Flux partitioning and a process‐based model of Sphagnum photosynthesis demonstrated the likelihood of seasonally dynamic maximum rates of photosynthesis and a logistic relationship between the water table and photosynthesizing tissue area when the water table was at the Sphagnum surface. The model also suggested that variability in internal resistance to CO 2 transport, a function of Sphagnum water content, had minimal effect on GPP. To accurately model Sphagnum GPP, we recommend the following: (1) understanding seasonal photosynthetic trait variation andmore »
- Authors:
-
- United States Department of Agriculture (USDA), United States Forest Service (USFS), Grand Rapids
- ORNL
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1376398
- Alternate Identifier(s):
- OSTI ID: 1402147
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Biogeosciences
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 5; Journal ID: ISSN 2169-8953
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Sebestyen, Stephen D., Norby, Richard J., Hanson, Paul J., Wullschleger, Stan D., Gu, Lianhong, Weston, David, Walker, Anthony P., Carter, Kelsey R., and Malhotra, Avni. Biophysical drivers of seasonal variability in Sphagnum gross primary production in a northern temperate bog. United States: N. p., 2017.
Web. doi:10.1002/2016JG003711.
Sebestyen, Stephen D., Norby, Richard J., Hanson, Paul J., Wullschleger, Stan D., Gu, Lianhong, Weston, David, Walker, Anthony P., Carter, Kelsey R., & Malhotra, Avni. Biophysical drivers of seasonal variability in Sphagnum gross primary production in a northern temperate bog. United States. https://doi.org/10.1002/2016JG003711
Sebestyen, Stephen D., Norby, Richard J., Hanson, Paul J., Wullschleger, Stan D., Gu, Lianhong, Weston, David, Walker, Anthony P., Carter, Kelsey R., and Malhotra, Avni. Tue .
"Biophysical drivers of seasonal variability in Sphagnum gross primary production in a northern temperate bog". United States. https://doi.org/10.1002/2016JG003711. https://www.osti.gov/servlets/purl/1376398.
@article{osti_1376398,
title = {Biophysical drivers of seasonal variability in Sphagnum gross primary production in a northern temperate bog},
author = {Sebestyen, Stephen D. and Norby, Richard J. and Hanson, Paul J. and Wullschleger, Stan D. and Gu, Lianhong and Weston, David and Walker, Anthony P. and Carter, Kelsey R. and Malhotra, Avni},
abstractNote = {Abstract Sphagnum mosses are the keystone species of peatland ecosystems. With rapid rates of climate change occurring in high latitudes, vast reservoirs of carbon accumulated over millennia in peatland ecosystems are potentially vulnerable to rising temperature and changing precipitation. We investigate the seasonal drivers of Sphagnum gross primary production (GPP)—the entry point of carbon into wetland ecosystems. Continuous flux measurements and flux partitioning show a seasonal cycle of Sphagnum GPP that peaked in the late summer, well after the peak in photosynthetically active radiation. Wavelet analysis showed that water table height was the key driver of weekly variation in Sphagnum GPP in the early summer and that temperature was the primary driver of GPP in the late summer and autumn. Flux partitioning and a process‐based model of Sphagnum photosynthesis demonstrated the likelihood of seasonally dynamic maximum rates of photosynthesis and a logistic relationship between the water table and photosynthesizing tissue area when the water table was at the Sphagnum surface. The model also suggested that variability in internal resistance to CO 2 transport, a function of Sphagnum water content, had minimal effect on GPP. To accurately model Sphagnum GPP, we recommend the following: (1) understanding seasonal photosynthetic trait variation and its triggers in Sphagnum ; (2) characterizing the interaction of Sphagnum photosynthesizing tissue area with water table height; (3) modeling Sphagnum as a “soil” layer for consistent simulation of water dynamics; and (4) measurement of Sphagnum “canopy” properties: extinction coefficient ( k ), clumping (Ω), and maximum stem area index (SAI).},
doi = {10.1002/2016JG003711},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 5,
volume = 122,
place = {United States},
year = {Tue Apr 18 00:00:00 EDT 2017},
month = {Tue Apr 18 00:00:00 EDT 2017}
}
Web of Science
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Dynamic Vertical Profiles of Peat Porewater Chemistry in a Northern Peatland
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Intermediate-scale community-level flux of CO2 and CH4 in a Minnesota peatland: putting the SPRUCE project in a global context
journal, August 2016
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Modelling photosynthesis of cotton grown in elevated CO2
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- Plant, Cell and Environment, Vol. 15, Issue 3
Can a bog drained for forestry be a stronger carbon sink than a natural bog forest?
journal, January 2014
- Hommeltenberg, J.; Schmid, H. P.; Drösler, M.
- Biogeosciences, Vol. 11, Issue 13
A dynamic model of wetland extent and peat accumulation: results for the Holocene
journal, January 2012
- Kleinen, T.; Brovkin, V.; Schuldt, R. J.
- Biogeosciences, Vol. 9, Issue 1
A comprehensive data acquisition and management system for an ecosystem-scale peatland warming and elevated CO2 experiment
journal, January 2015
- Krassovski, M. B.; Riggs, J. S.; Hook, L. A.
- Geoscientific Instrumentation, Methods and Data Systems, Vol. 4, Issue 2
Ecosystem Respiration in a Cool Temperate Bog Depends on Peat Temperature But Not Water Table
journal, September 2005
- Lafleur, P. M.; Moore, T. R.; Roulet, N. T.
- Ecosystems, Vol. 8, Issue 6
Mixing ratio and species affect the use of substrate‐derived CO 2 by Sphagnum
journal, January 2008
- Limpens, J.; Robroek, B. J. M.; Heijmans, M. M. P. D.
- Journal of Vegetation Science, Vol. 19, Issue 6
Global-scale pattern of peatland Sphagnum growth driven by photosynthetically active radiation and growing season length
journal, January 2012
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Evaporation from a sphagnum moss surface
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- Journal of Hydrology, Vol. 48, Issue 3-4
The effects of water table manipulation and elevated temperature on the net CO 2 flux of wet sedge tundra ecosystems
journal, January 1998
- Oechel, Walter C.; Vourlitis, George L.; Hastings, Steven J.
- Global Change Biology, Vol. 4, Issue 1
On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm
journal, September 2005
- Reichstein, Markus; Falge, Eva; Baldocchi, Dennis
- Global Change Biology, Vol. 11, Issue 9
Contemporary carbon balance and late Holocene carbon accumulation in a northern peatland
journal, February 2007
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Works referencing / citing this record:
Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota
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