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| Titel |
Carbon fluxes of surfaces vs. ecosystems: advantages of measuring eddy covariance and soil respiration simultaneously in dry grassland ecosystems |
| VerfasserIn |
Z. Nagy, K. Pintér, M. Pavelka, E. Darenová, J. Balogh |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 9 ; Nr. 8, no. 9 (2011-09-09), S.2523-2534 |
| Datensatznummer |
250006117
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| Publikation (Nr.) |
 copernicus.org/bg-8-2523-2011.pdf |
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| Zusammenfassung |
| An automated open system for measurement of soil CO2 efflux (Rsc)
was developed and calibrated against known fluxes. The system was tested in
the field, while estimating soil respiration simultaneously by the gradient
method (Rsg) at a dry, sandy grassland site (Bugac, Hungary). Ecosystem
respiration (Rego) was measured using the eddy covariance technique.
The small chamber size (5 cm in diameter) made it possible to use the
chambers in vegetation gaps, thereby avoiding the necessity of removing
shoots and disturbing the spatial structure of vegetation and the upper soil
layer. Low air flow rates associated with small chamber volume and chamber
design allowed the overpressure range to stabilize between 0.05–0.12 Pa.
The correlation between ecosystem and soil CO2 efflux rates as measured
by the independent methods was significant, Reco rates were similar or
even lower than Rsc in the low flux (up to 2 μmol CO2 m−2 s−1) range but the differences were within the
uncertainty limits for the two fluxes. Rsc from trenched and
non-trenched plots amounted to 16 % and 44 % of Reco, respectively.
The gradient method showed both up and downward CO2 fluxes originating
from the main rooting zone after rains. Diffusive retardation played a
smaller role than CO2 production considering the soil air CO2
concentration increase after rains in a given layer. Downward fluxes within
the soil profile amounted to 15 % of the simultaneous upward fluxes and to
~7.6 % of the total (upward) effluxes during the 3-month study. The
upper 5 cm soil layer contributed to ~50 % of the total soil
CO2 efflux. Downward fluxes are expected to seriously affect (1) the
Reco vs. temperature response functions and (2) the net ecosystem
exchange of CO2 (NEE) vs. photon flux density response functions,
therefore potentially affecting the gap filling procedures and to lead to a
situation (3) when the measured surface and the real time ecosystem fluxes
will necessarily differ in the short term. Simultaneous measurements of
Reco and soil CO2 effluxes may reveal the timing and magnitude of
the decoupling, thereby contributing to decreasing uncertainty associated
with eddy flux measurements over flat terrains. While the correlations
between CO2 effluxes measured by independent systems are strong,
Rsg was generally larger than Rsc or Reco, mainly due to
overestimation of effective diffusivity in the soil. |
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