Aspen Bibliography

Carbon dioxide efflux from the floor of a boreal aspen forest. II. Evaluation of methods - verification by infra-red analysis of a dynamic closed chamber

Document Type

Article

Journal/Book Title/Conference

Canadian Journal of Soil Science

Volume

78

Issue

2

First Page

311

Last Page

316

Publication Date

1998

Abstract

Russell, C. A., Voroney, R. P., Black, T. A., Blanken, P. D. and Yang, P. C. 1998. Carbon dioxide efflux from the floor of a boreal aspen forest. II. Evaluation of methods — verification by infra-red analysis of a dynamic closed chamber. Can. J.

Soil Sci. 78: 311–316. Concern over the global exchange of carbon has highlighted the need for reliable estimates of soil CO efflux (soil Fc). Appropriate methods to estimate soil Fc must be identified and adopted. In this study we used a dynamic closed chamber and infra-red gas analyzer (DCC-IRGA) to verify the use of three other methods in a boreal aspen (Populus tremu-

loides) forest. The three methods were: (1) soil CO ry (a) and empirical relationship (b), (2) an automated steady-state chamber and (3) daytime estimates derived from a relationship between soil temperature and nighttime eddy correlation measures of CO fluxes above the forest understory (4 m) and overstorey

2

concentration gradients and volumetric soil moisture by both diffusion theo- 2

(39 m). We found reasonable agreement between DCC-IRGA and method 1a (R2 = 0.44 to 0.62), and excellent agreement between DCC-IRGA and the other methods (1b, R2 = 0.76 to 0.88; 2, R2 = 0.89 and 3, R2 = 0.64 to 0.80). Each of these methods has advan- tages beyond the scope of the DCC-IRGA, and these are discussed.

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