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Title: Biophysical drivers of seasonal variability in Sphagnum gross primary production in a northern temperate bog

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. Here, the model also suggested that variability in internal resistance to CO2 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 itsmore » 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).« less

Authors:
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2]
  1. United States Department of Agriculture (USDA), United States Forest Service (USFS), Grand Rapids
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (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. 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., and Malhotra, Avni. Tue . "Biophysical drivers of seasonal variability in Sphagnum gross primary production in a northern temperate bog". United States. doi: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 = {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. Here, the model also suggested that variability in internal resistance to CO2 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 = {2017},
month = {4}
}

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