CheneBelgiqueV1, Main, Exploration, bibRecord, 000A91

Calibration and validation of an empirical approach to model soil CO2 efflux in a deciduous forest

Identifieur interne : 000A91 ( Main/Exploration ); précédent : 000A90; suivant : 000A92

Calibration and validation of an empirical approach to model soil CO2 efflux in a deciduous forest

Auteurs : J. Curiel Yuste [États-Unis] ; I. A. Janssens [Belgique] ; R. Ceulemans [Belgique]

Source :

Biogeochemistry : (Dordrecht) [ 0168-2563 ] ; 2005.

RBID : Pascal:05-0373935

Descripteurs français

Pascal (Inist)
- Etalonnage, Modèle, Sol, Forêt, Respiration, Quercus, Température, Humidité sol, Teneur eau, Carbone, Sécheresse, Fraction fine, Qualité, Hystérésis, Interaction sol végétation atmosphère, Dioxyde carbone, Emission atmosphérique, Microorganisme, Analyse statistique, Biomasse, Racine, Campine, Belgique.
Wicri :
- geographic : Belgique.
- topic : Forêt, Carbone, Sécheresse, Biomasse.

English descriptors

KwdEn :
- Belgium, Campine, Quercus, atmosphere-vegetation-soil interaction, atmospheric emission, biomass, calibration, carbon, carbon dioxide, drought, fine-grained materials, forests, hysteresis, microorganisms, models, quality, respiration, roots, soil moisture, soils, statistical analysis, temperature, water content.

Abstract

Soil respiration (Rs) was monitored periodically throughout 2001 and 2003 in a pedunculate oak (Quercus robur L.) stand located in the Belgian Campine region. An empirical model originally developed for a neighboring pine stand, that accounts for variation in temperature, soil moisture, rewetting of the surface layers by rain during dry periods and seasonal fresh litter inputs, was fitted to the data. The model explained 92% and 94% of the temporal variability in Rs during 2001 and 2003 respectively. Monthly measurements of Rs can suffice to build a robust empirical model if temperature is the main controlling factor. However, during the driest period of the year a weekly sampling schedule was needed to capture the combined effect of temperature, soil water content (SWC) and the short-term effect of rewetting played. Although the model was developed for gap-filling purposes it also showed a remarkable predictive ability for this site and these conditions. Annual emissions of carbon (C) estimated with the model were significantly higher in 2001 than in 2003 (7.8 and 5.9 ton C ha^-1 year^-1. respectively). The severe drought during most of the growing season in 2003 caused a high fine root mortality and a decrease in microbial activity, and was likely the main responsible factor of the almost 2 ton C ha^-1 year^-1 differences in Rs between both years. Pulses of Rs during drying/rewetting cycles accounted for a substantial fraction of the total flux, especially during the driest year. Finally, our results show that quality of the substrate may play an important role in both the intensity of the rewetting pulses of CO₂ and the seasonality of Rs.

Affiliations:

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Le document en format XML

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<term>Modèle</term>
<term>Sol</term>
<term>Forêt</term>
<term>Respiration</term>
<term>Quercus</term>
<term>Température</term>
<term>Humidité sol</term>
<term>Teneur eau</term>
<term>Carbone</term>
<term>Sécheresse</term>
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<term>Qualité</term>
<term>Hystérésis</term>
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<term>Emission atmosphérique</term>
<term>Microorganisme</term>
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<front><div type="abstract" xml:lang="en">Soil respiration (Rs) was monitored periodically throughout 2001 and 2003 in a pedunculate oak (Quercus robur L.) stand located in the Belgian Campine region. An empirical model originally developed for a neighboring pine stand, that accounts for variation in temperature, soil moisture, rewetting of the surface layers by rain during dry periods and seasonal fresh litter inputs, was fitted to the data. The model explained 92% and 94% of the temporal variability in Rs during 2001 and 2003 respectively. Monthly measurements of Rs can suffice to build a robust empirical model if temperature is the main controlling factor. However, during the driest period of the year a weekly sampling schedule was needed to capture the combined effect of temperature, soil water content (SWC) and the short-term effect of rewetting played. Although the model was developed for gap-filling purposes it also showed a remarkable predictive ability for this site and these conditions. Annual emissions of carbon (C) estimated with the model were significantly higher in 2001 than in 2003 (7.8 and 5.9 ton C ha<sup>-1</sup>
 year<sup>-1</sup>
. respectively). The severe drought during most of the growing season in 2003 caused a high fine root mortality and a decrease in microbial activity, and was likely the main responsible factor of the almost 2 ton C ha<sup>-1</sup>
 year<sup>-1</sup>
 differences in Rs between both years. Pulses of Rs during drying/rewetting cycles accounted for a substantial fraction of the total flux, especially during the driest year. Finally, our results show that quality of the substrate may play an important role in both the intensity of the rewetting pulses of CO<sub>2</sub>
 and the seasonality of Rs.</div>
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Calibration and validation of an empirical approach to model soil CO2 efflux in a deciduous forest

Calibration and validation of an empirical approach to model soil CO2 efflux in a deciduous forest

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri