Soil–atmosphere exchange of carbonyl sulfide in a Mediterranean citrus orchard
-
Published:2019-03-25
Issue:6
Volume:19
Page:3873-3883
-
ISSN:1680-7324
-
Container-title:Atmospheric Chemistry and Physics
-
language:en
-
Short-container-title:Atmos. Chem. Phys.
Author:
Yang Fulin, Qubaja RafatORCID, Tatarinov Fyodor, Stern RafaelORCID, Yakir Dan
Abstract
Abstract. Carbonyl sulfide (COS) is used as a tracer of CO2 exchange at
the ecosystem and larger scales. The robustness of this approach depends on
knowledge of the soil contribution to the ecosystem fluxes, which is
uncertain at present. We assessed the spatial and temporal variations in soil
COS and CO2 fluxes in a Mediterranean citrus orchard combining
surface flux chambers and soil concentration gradients. The spatial
heterogeneity in soil COS exchange indicated net uptake below and between
trees of up to 4.6 pmol m−2 s−1 and net emission in sun-exposed
soil between rows of up to 2.6 pmol m−2 s−1, with an overall mean
uptake value of 1.1±0.1 pmol m−2 s−1. Soil COS
concentrations decreased with soil depth from atmospheric levels of ∼450
to ∼100 ppt at 20 cm depth, while CO2 concentrations increased
from ∼400 to ∼5000 ppm. COS flux estimates from the soil
concentration gradients were, on average,
-1.0±0.3 pmol m−2 s−1, consistent with the chamber
measurements. A soil COS flux algorithm driven by soil moisture and
temperature (5 cm depth) and distance from the nearest tree, could explain
75 % of variance in soil COS flux. Soil relative uptake, the normalized
ratio of COS to CO2 fluxes was, on average, -0.4±0.3 and
showed a general exponential response to soil temperature. The results
indicated that soil COS fluxes at our study site were dominated by uptake,
with relatively small net fluxes compared to both soil respiration and
reported canopy COS fluxes. Such a result should facilitate the application of
COS as a powerful tracer of ecosystem CO2 exchange.
Funder
Minerva Foundation Israel Science Foundation National Natural Science Foundation of China Natural Science Foundation of Gansu Province
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference48 articles.
1. Asaf, D., Rotenberg, E., Tatarinov, F., Dicken, U., Montzka, S. A., and
Yakir, D.: Ecosystem photosynthesis inferred from measurements of carbonyl
sulphide flux, Nat. Geosci., 6, 18–190, 2013. 2. Bekele, A., Kellman, L., and Beltrami, H.: Soil Profile CO2
concentrations in forested and clear cut sites in Nova Scotia, Canada,
Forest. Ecol. Manag., 242, 587–597, 2007. 3. Berkelhammer, M., Asaf, D., Still, C., Montzka, S., Noone, D., Gupta, M.,
Provencal, R., Chen, H., and Yakir, D.: Constraining surface carbon fluxes
using in situ measurements of carbonyl sulfide and carbon dioxide, Global
Biogeochem. Cy., 28, 161–179, 2014. 4. Berry, J., Wolf, A., Campbell, J. E., Baker, I., Blake, N., Blake, D.,
Denning, A. S., Kawa, S. R., Montzka, S. A., and Seibt, U.: A coupled model
of the global cycles of carbonyl sulfide and CO2: A possible new
window on the carbon cycle, J. Geophys. Res.-Biogeosci., 118, 842–852, 2013. 5. Bunk, R., Behrendt, T., Yi, Z., Andreae, M. O., and Kesselmeier, J.: Exchange
of carbonyl sulfide (OCS) between soils and atmosphere under various
CO2 concentrations, J. Geophys. Res.-Biogeosci., 122, 1343–1358,
2017.
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|