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Comparison of Two Static Chamber Techniques for Determining Carbon Dioxide Efflux from Forest Soils
Author(s) -
Raich J. W.,
Bowden R. D.,
Steudler P. A.
Publication year - 1990
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1990.03615995005400060041x
Subject(s) - diel vertical migration , carbon dioxide , environmental science , soil water , flux (metallurgy) , sampling (signal processing) , efflux , environmental chemistry , soil science , chemistry , incubation , range (aeronautics) , trace gas , atmospheric sciences , ecology , geology , biology , materials science , biochemistry , organic chemistry , filter (signal processing) , computer science , composite material , computer vision
The similarity of two commonly used methods of measuring CO 2 fluxes from forest soils was assessed by directly comparing the sodalime method with a static chamber technique using gas chromatographic analysis of CO 2 ‐concentration changes during short‐term incubations. A paired‐chamber sampling design was applied in 11 different forest stands to examine the two methods across a range of soil‐CO 2 efflux rates. Carbon dioxide efflux rates were highly variable within sites, and showed no spatial autocorrelation. No consistent differences in measured rates of CO 2 efflux were observed between the two methods, indicating that either method may be applied to the range of mean daily rates encountered in this study (1.7–11.4 g m −2 d −1 ). A large number of chambers can be deployed with the soda‐lime method, but no information on diel variations in efflux rates is obtained. The short‐term incubation technique, on the other hand, can be utilized to simultaneously monitor several trace gases and diel trends in flux rates. Selection between the methods should be based on the hypotheses being tested or on practical constraints.