Soil temperature synchronisation improves representation of diel variability of ecosystem respiration in Sphagnum peatlands

Abstract : tThe temperature dependence of Ecosystem Respiration (ER) is often assessed based on the temperatureof one specific layer. Air temperature or temperatures in the first ten centimetres of the soil profile are themost frequently used temperatures in models. However, previous studies showed that the relationshipbetween ER and temperature is depth dependent, making depth selection for temperature measurementsan important issue, especially at short time-scales. The present study explores one possible way to assessthis relationship by synchronising the ER and temperature signals and to test if the relationship betweenER and temperature differs between daytime and nighttime. To do so, ER measurements were undertakenin 2013 in four Sphagnum-peatlands across France using the closed chamber method. The ER fluxes weremeasured hourly during 72 h in each of four replicates in each site. Synchronisations between ER and Tsignal were determined for each depth (from surface to 30 cm depth) by selecting the time-delay leadingto the best correlation between ER and soil temperatures and ER was then modelled. Our results showedthat: (i) the delay between ER and soil temperature is greater in peat than in mineral soils; (ii) at a dailytime-scale synchronisation can improve the model representation using soil temperatures.
Type de document :
Article dans une revue
Agricultural and Forest Meteorology, Elsevier Masson, 2016, 223, pp.95-102. 〈10.1016/j.agrformet.2016.03.021〉
Liste complète des métadonnées

Littérature citée [18 références]  Voir  Masquer  Télécharger

https://hal-insu.archives-ouvertes.fr/insu-01303659
Contributeur : Nathalie Pothier <>
Soumis le : lundi 18 avril 2016 - 15:31:54
Dernière modification le : jeudi 7 février 2019 - 17:10:34
Document(s) archivé(s) le : mardi 19 juillet 2016 - 13:42:09

Fichier

manuscript_revised.pdf
Fichiers produits par l'(les) auteur(s)

Licence


Distributed under a Creative Commons Paternité - Pas d'utilisation commerciale - Pas de modification 4.0 International License

Identifiants

Citation

Benoît D’angelo, Sébastien Gogo, Fatima Laggoun-Défarge, Franck Le Moing, Fabrice Jégou, et al.. Soil temperature synchronisation improves representation of diel variability of ecosystem respiration in Sphagnum peatlands. Agricultural and Forest Meteorology, Elsevier Masson, 2016, 223, pp.95-102. 〈10.1016/j.agrformet.2016.03.021〉. 〈insu-01303659〉

Partager

Métriques

Consultations de la notice

483

Téléchargements de fichiers

183