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Carbon Fluxes of Surfaces Vs. Ecosystems: Advantages of Measuring Eddy Covariance and Soil Respiration Simultaneously in Dry Grassland Ecosystems : Volume 8, Issue 9 (09/09/2011)

By Nagy, Z.

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Book Id: WPLBN0004004291
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Carbon Fluxes of Surfaces Vs. Ecosystems: Advantages of Measuring Eddy Covariance and Soil Respiration Simultaneously in Dry Grassland Ecosystems : Volume 8, Issue 9 (09/09/2011)  
Author: Nagy, Z.
Volume: Vol. 8, Issue 9
Language: English
Subject: Science, Biogeosciences
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Pavelka, M., Darenová, E., Pintér, K., Nagy, Z., & Balogh, J. (2011). Carbon Fluxes of Surfaces Vs. Ecosystems: Advantages of Measuring Eddy Covariance and Soil Respiration Simultaneously in Dry Grassland Ecosystems : Volume 8, Issue 9 (09/09/2011). Retrieved from http://www.ebooklibrary.org/


Description
Description: Plant Ecology Research Group of Hungarian Academy of Sciences, Szent István University, Páter u. 1., 2103 Gödöllõ, Hungary. 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.

Summary
Carbon fluxes of surfaces vs. ecosystems: advantages of measuring eddy covariance and soil respiration simultaneously in dry grassland ecosystems

Excerpt
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