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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
Author(s) -
Berkelhammer M.,
Alsip B.,
Matamala R.,
Cook D.,
Whelan M. E.,
Joo E.,
Bernacchi C.,
Miller J.,
Meyers T.
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl085652
Subject(s) - canopy , canopy conductance , stomatal conductance , environmental science , vapour pressure deficit , carbonyl sulfide , growing season , atmospheric sciences , productivity , trace gas , flux (metallurgy) , agronomy , transpiration , ecology , chemistry , photosynthesis , biology , botany , geology , sulfur , macroeconomics , organic chemistry , economics
There are inherent challenges in scaling stomatal conductance (gs ) 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 CO2fluxes from a predominantly C3 prairie and C4 maize field in the midwestern United States. The gsderived from OCS fluxes captured a transition in the stomatal limitation on gross primary productivity (GPP) through the growing season as well as seasonally persistent gsdynamics such as temperature optimum and a positive response of nighttime gsto vapor pressure deficit. Near the termination of the prairie growing season, we observed a decrease in the relative OCS to CO2flux that we hypothesize emerged from a rising contribution of C4 plants to productivity. The results show how plot‐scale OCS and CO2fluxes can be used as a trace gas diagnostic for transitions in the limiting factors for community GPP.
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