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Sources and sinks of carbonyl sulfide in an agricultural field in the Southern Great Plains

Maseyk, Kadmiel; Berry, Joseph A.; Billesbach, Dave; Campbell, John Elliott; Torn, Margaret S.; Zahniser, Mark and Seibt, Ulli (2014). Sources and sinks of carbonyl sulfide in an agricultural field in the Southern Great Plains. Proceedings of the National Academy of Sciences, 111(25) pp. 9064–9069.

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Net photosynthesis is the largest single flux in the global carbon cycle, but controls over its variability are poorly understood because there is no direct way of measuring it at the ecosystem scale. We report observations of ecosystem carbonyl sulfide (COS) and CO2 fluxes that resolve key gaps in an emerging framework for using concurrent COS and CO2 measurements to quantify terrestrial gross primary productivity. At a wheat field in Oklahoma we found that in the peak growing season the flux-weighted leaf relative uptake of COS and CO2 during photosynthesis was 1.3, at the lower end of values from laboratory studies, and varied systematically with light. Due to nocturnal stomatal conductance, COS uptake by vegetation continued at night, contributing a large fraction (29%) of daily net ecosystem COS fluxes. In comparison, the contribution of soil fluxes was small (1–6%) during the peak growing season. Upland soils are usually considered sinks of COS. In contrast, the well-aerated soil at the site switched from COS uptake to emissions at a soil temperature of around 15 °C. We observed COS production from the roots of wheat and other species and COS uptake by root-free soil up to a soil temperature of around 25 °C. Our dataset demonstrates that vegetation uptake is the dominant ecosystem COS flux in the peak growing season, providing support of COS as an independent tracer of terrestrial photosynthesis. However, the observation that ecosystems may become a COS source at high temperature needs to be considered in global modeling studies.

Item Type: Journal Item
ISSN: 0027-8424
Project Funding Details:
Funded Project NameProject IDFunding Body
Biological and Environmental Research Division AwardDE-SC0007094Department of Environment
Not SetDE-AC02-05CH11231Department of Environment
Small Business Innovation Research GrantDE-SC0001801Department of Environment
Keywords: carbonic anhydrase; LRU; ERU; flux partitioning; soil metabolism
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
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Item ID: 45873
Depositing User: Kadmiel Maseyk
Date Deposited: 29 Mar 2016 13:58
Last Modified: 30 May 2019 13:39
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