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Seasonal Evolution of Canopy Stomatal Conductance for a Prairie and Maize Field in the Midwestern United States from Continuous Carbonyl Sulfide Fluxes

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2019GL085652· OSTI ID:1604483
 [1];  [1];  [2];  [2];  [3];  [4];  [5];  [4];  [6]
  1. Department of Earth and Environmental Sciences University of Illinois at Chicago Chicago IL USA
  2. Environmental Science Division Argonne National Laboratory Lemont IL USA
  3. Department of Environmental Sciences Rutgers University New Brunswick NJ USA
  4. School of Integrative Biology University of Illinois Urbana IL USA
  5. School of Integrative Biology University of Illinois Urbana IL USA, Global Change and Photosynthesis Research Unit, USDA‐ARS Urbana IL USA
  6. Atmospheric Turbulence and Diffusion Division National Oceanic and Atmospheric Administration Silver Spring MD USA
Abstract

There are inherent challenges in scaling stomatal conductance (g ) from leaf to canopy particularly over seasonal time scales when species distribution and canopy structure evolve. We address this gap using carbonyl sulfide (OCS) and CO fluxes from a predominantly C3 prairie and C4 maize field in the midwestern United States. The g derived from OCS fluxes captured a transition in the stomatal limitation on gross primary productivity (GPP) through the growing season as well as seasonally persistent g dynamics such as temperature optimum and a positive response of nighttime g to vapor pressure deficit. Near the termination of the prairie growing season, we observed a decrease in the relative OCS to CO flux that we hypothesize emerged from a rising contribution of C4 plants to productivity. The results show how plot‐scale OCS and CO fluxes can be used as a trace gas diagnostic for transitions in the limiting factors for community GPP.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0020285
OSTI ID:
1604483
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 6 Vol. 47; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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