carbonyl sulfide exchange in soils for better estimates of ecosystem carbon uptake
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2016
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Abstract
Carbonyl sulfide (COS) measurements are one of the emerging tools to
better quantify gross primary production (GPP), the largest flux in
the global carbon cycle. COS is a gas with a similar structure to
CO2; COS uptake is thought to be a proxy for GPP. However,
soils are a potential source or sink of COS. This study presents
a framework for understanding soil–COS interactions. Excluding
wetlands, most of the few observations of isolated soils that have
been made show small uptake of atmospheric COS. Recently, a series
of studies at an agricultural site in the central United States
found soil COS production under hot conditions an order of magnitude
greater than fluxes at other sites. To investigate the extent of
this phenomenon, soils were collected from five new sites and incubated
in a variety of soil moisture and temperature states. We found that
soils from a desert, an oak savannah, a deciduous forest, and
a rainforest exhibited small COS fluxes, behavior resembling
previous studies. However, soil from an agricultural site in
Illinois, > 800 km away from the initial central US study
site, demonstrated comparably large soil fluxes under similar
conditions. These new data suggest that, for the most part, soil COS
interaction is negligible compared to plant uptake of COS. We
present a model that anticipates the large agricultural soil fluxes
so that they may be taken into account. While COS air-monitoring
data are consistent with the dominance of plant uptake, improved
interpretation of these data should incorporate the soil flux
parameterizations suggested here.
| Reference Key |
whelan2016atmosphericcarbonyl
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|---|---|
| Authors | ;M. E. Whelan;M. E. Whelan;T. W. Hilton;J. A. Berry;M. Berkelhammer;A. R. Desai;J. E. Campbell |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-3711-2016
|
| URL | |
| Keywords |
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