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Spatial variability in forest soil CO 2 efflux assessed with a calibrated soda lime technique
Author(s) -
Veerle Janssens,
Ceulemans
Publication year - 1998
Publication title -
ecology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.852
H-Index - 265
eISSN - 1461-0248
pISSN - 1461-023X
DOI - 10.1046/j.1461-0248.1998.00026.x
Subject(s) - lime , environmental science , spatial variability , calibration , soil science , sample (material) , remote sensing , statistics , mathematics , geography , chemistry , geology , paleontology , chromatography
Accurate estimates of soil CO 2 efflux are important in the current discussion on the carbon balance of forests, and can be used to validate models and remotely sensed data. Due to the typically large spatial variability, large sample numbers are required to estimate mean forest soil CO 2 efflux with reasonable confidence intervals. Most infrared gas analysis (IRGA) systems are not well suited to simultaneously produce daily means and handle this spatial variability problem. The soda lime technique gives daily means and allows the required large sample numbers, but is less accurate than the IRGA systems. Using an elaborate cross‐calibration, we tried to combine the accuracy of an IRGA method with the spatial integration potential of the soda lime technique. This paper reports on the calibration technique used to improve the accuracy of the soda lime technique and confirms the spatial variability in soil CO 2 efflux in a heterogeneous forest.