Cross-calibration functions for soil CO2 efflux measurement systems

Ngao, Jerome; Longdoz, Bernard; Perrin, Dominique; Vincent, Gaelle; Epron, Daniel; Le Dantec, Valerie; Soudani, Kamel; Aubinet, Marc; Willm, Francois; Granier, Andre

doi:10.1051/forest:2006028

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Article (Scientific journals)

Cross-calibration functions for soil CO2 efflux measurement systems

Ngao, Jerome; Longdoz, Bernard; Perrin, Dominique et al.

2006 • In Annals of Forest Science, 63 (5), p. 477-484

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https://hdl.handle.net/2268/32037

DOI
10.1051/forest:2006028

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Keywords :

cross calibration; forest ecosystem; measurement system; pressure effect; soil CO2 efflux

Abstract :

[en] Different soil CO2 efflux measurement systems and methodologies were used to estimate the annual soil respiration of different forest sites. To allow comparison between these annual values, this study aimed to cross-calibrate five soil CO2 efflux (RS) closed dynamic chamber systems, and compare the in situ measurement methodologies. We first assessed the impact of the measurement methodology on RS by studying the effects of three parameters: record duration, time lag before starting to record and the mode of chamber-soil contact (use of collars or insertion of the chambers into the soil). Secondly, we directly compared systems with identical methodology during field measurements on three forest sites. We observed a significant influence of the chamber-soil contact mode (no impact of the record duration and duration before starting to record). Measurements obtained by insertion led to significantly higher estimates of RS than those obtained using collars (up to 28%). Our inter-comparison showed that deviations existing between in situ measurements performed with the different systems were partly systematic and could be corrected using simple linear equations. Measurements of pressure difference between the inside and the outside of soil chambers allowed explaining a part of the observed deviations between systems. Finally, we assessed the influence of the cross-calibration equations on annual respiration of two beech forest soils.

Disciplines :

Phytobiology (plant sciences, forestry, mycology...)

Author, co-author :

Ngao, Jerome

Longdoz, Bernard

Perrin, Dominique ; Université de Liège - ULiège > Gembloux Agro-Bio Tech > Physique des biosystèmes

Vincent, Gaelle

Epron, Daniel

Le Dantec, Valerie

Soudani, Kamel

Aubinet, Marc ; Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech

Willm, Francois

Granier, Andre

Language :

English

Title :

Cross-calibration functions for soil CO2 efflux measurement systems

Publication date :

2006

Journal title :

Annals of Forest Science

ISSN :

1286-4560

eISSN :

1297-966X

Publisher :

Edp Sciences S a, Les Ulis Cedex a, France

Volume :

Issue :

Pages :

477-484

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 08 December 2009

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