Spatial variability in forest soil CO2 efflux assessed with a calibrated soda lime technique

Citation
Ia. Janssens et R. Ceulemans, Spatial variability in forest soil CO2 efflux assessed with a calibrated soda lime technique, ECOL LETT, 1(2), 1998, pp. 95-98
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
ECOLOGY LETTERS
ISSN journal
1461-023X → ACNP
Volume
1
Issue
2
Year of publication
1998
Pages
95 - 98
Database
ISI
SICI code
1461-023X(199809)1:2<95:SVIFSC>2.0.ZU;2-P
Abstract
Accurate estimates of soil CO2 afflux are important in the current discussi on on the carbon balance of forests, and can be used to validate models and remotely sensed data. Due to the typically large spatial variability, larg e sample numbers are required to estimate mean forest soil CO2 efflux with reasonable confidence intervals. Most infrared gas analysis (IRGA) systems are not well suited to simultaneously produce daily means and handle this s patial variability problem. The soda lime technique gives daily means and a llows the required large sample numbers, but is less accurate than the IRGA systems. Using an elaborate cross-calibration, we tried to combine the acc uracy of an IRGA method with the spatial integration potential of the soda lime technique. This paper reports on the calibration technique used to imp rove the accuracy of the soda lime technique and confirms the spatial varia bility in soil CO2 efflux in a heterogeneous forest.