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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 102, NO. D24, PAGES 28,771–28,777, 1997

A comparison of six methods for measuring soil-surface carbon dioxide fluxes

J. M. Norman


C. J. Kucharik


S. T. Gower


D. D. Baldocchi


P. M. Crill


M. Rayment


K. Savage


R. G. Striegl


Abstract

Measurements of soil-surface CO2 fluxes are important for characterizing the carbon budget of boreal forests because these fluxes can be the second largest component of the budget. Several methods for measuring soil-surface CO2 fluxes are available: (1) closed-dynamic-chamber systems, (2) closed-static-chamber systems, (3) open-chamber systems, and (4) eddy covariance systems. This paper presents a field comparison of six individual systems for measuring soil-surface CO2 fluxes with each of the four basic system types represented. A single system is used as a reference and compared to each of the other systems individually in black spruce (Picea mariana), jack pine (Pinus banksiana), or aspen (Populus tremuloides) forests. Fluxes vary from 1 to 10 μmol CO2 m−2 s−1. Adjustment factors to bring all of the systems into agreement vary from 0.93 to 1.45 with an uncertainty of about 10–15%.

Received 17 May 1996; accepted 12 May 1997.

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Citation: Norman, J. M., C. J. Kucharik, S. T. Gower, D. D. Baldocchi, P. M. Crill, M. Rayment, K. Savage, and R. G. Striegl (1997), A comparison of six methods for measuring soil-surface carbon dioxide fluxes, J. Geophys. Res., 102(D24), 28,771–28,777.