Net Ecosystem Exchange of Carbon dioxide in a Temperate Poor Fen: a Comparison of Automated and Manual Chamber Techniques Article Received: 30 July 2004 Accepted: 16 November 2004 DOI:
Cite this article as: Burrows, E.H., Bubier, J.L., Mosedale, A. et al. Biogeochemistry (2005) 76: 21. doi:10.1007/s10533-004-6334-6 Abstract
We used five analytical approaches to compare net ecosystem exchange (NEE) of carbon dioxide (CO
2) from automated and manual static chambers in a peatland, and found the methods comparable. Once per week we sampled manually from 10 collars with a closed chamber system using a LiCor 6200 portable photosynthesis system, and simulated four photosynthetically active radiation (PAR) levels using shrouds. Ten automated chambers sampled CO 2 flux every 3 h with a LiCor 6252 infrared gas analyzer. Results of the five comparisons showed (1) NEE measurements made from May to August, 2001 by the manual and automated chambers had similar ranges: −10.8 to 12.7 μmol CO 2 m −2 s −1 and −17.2 to 13.1 μmol CO 2 m −2 s −1, respectively. (2) When sorted into four PAR regimes and adjusted for temperature (respiration was measured under different temperature regimes), mean NEE did not differ significantly between the chambers ( p < 0.05). (3) Chambers were not significantly different in regression of ln( − respiration) on temperature. (4) But differences were found in the PAR vs. NEE relationship with manual chambers providing higher maximum gross photosynthesis estimates (GP max), and slower uptake of CO 2 at low PAR ( α) even after temperature adjustment. (5) Due to the high variability in chamber characteristics, we developed an equation that includes foliar biomass, water table, temperature, and PAR, to more directly compare automated and manual NEE. Comparing fitted parameters did not identify new differences between the chambers. These complementary chamber techniques offer a unique opportunity to assess the variability and uncertainty in CO 2 flux measurements. Keywords Automated chambers Chamber comparison CO 2 flux Fen Net ecosystem CO 2 exchange Wetland References Alm, J., Schulman, L., Walden, J., Nykanen, H., Martikainen, P.J., Silvola, J. 1999 Carbon balance of a boreal bog during a year with an exceptionally dry summer Ecology 80 161 174 Google Scholar Ambus, P., Robertson, G.P. 1998 Automated near-continuous measurement of carbon dioxide and nitrous oxide fluxes from soil Soil Sci. Soc. Am. J. 62 394 400 Google Scholar Aurela, M., Laurila, T., Tuovinen, J.-P. 2001 Seasonal CO 2 balances of a subarctic mire J. Geophys. Res. 106 1623 1637 CrossRef Google Scholar Barford, C.C., Wofsy, S.C., Goulden, M.L., et al. 2001 Factors controlling long- and short-term sequestration of atmospheric CO 2 in a mid-latitude forest Science 294 1688 1691 CrossRef PubMed Google Scholar Brown, D.A. 1998 Gas production from an ombrotrophic bog – effect of climate change on microbial ecology Climate Change 40 277 284 CrossRef Google Scholar Bubier, J.L., Crill, P.M., Moore, T.R., Savage, K., Varner, R.K. 1998 Seasonal patterns and controls on net ecosystem CO 2 exchange in a boreal peatland complex Global Biogeochem. Cycles 12 703 714 CrossRef Google Scholar Bubier, J.L., Crill, P.M., Mosedale, A. 2002 Net ecosystem exchange of CO 2 measured by autochambers during the snow-covered season at a temperate peatland Hydrol. Process. 16 3667 3682 CrossRef Google Scholar Bubier, J.L., Bhatia, G., Moore, T.R., Roulet, N.T., Lafleur, P.M. 2003a Spatial and temporal variability in growing season net ecosystem carbon dioxide exchange at a large peatland in OntarioCanada Ecosystems 6 353 367 Google Scholar Bubier, J.L., Crill, P.M., Mosedale, A., Frolking, S., Linder, E. 2003b Peatland responses to varying interannual moisture conditions as measured by automatic CO 2 chambers Global Biogeochem. Cycles 17 1066 CrossRef Google Scholar Bubier, J.L., Frolking, S., Crill, P.M., Linder, E. 1999 Net ecosystem productivity and its uncertainty in a diverse boreal peatland J. Geograph. Res. 104 27 Google Scholar Carroll, P., Crill, P.M. 1997 Carbon balance of a temperate poor fen Global Biogeochem. Cycles 11 349 356 CrossRef Google Scholar Conen, F., Smith, K.A. 2000 An explanation of linear increases in gas concentration under closed chambers used to measure gas exchange between soil and the atmosphere Eur. J. Soil Sci. 51 111 117 CrossRef Google Scholar Crill, P.M., Keller, M., Weitz, A., Grauel, B., Veldkamp, E. 2000 Intensive field measurements of nitrous oxide emissions from a tropical agricultural soil Global Biogeochem. Cycles 14 85 96 CrossRef Google Scholar Davidson, E.A., Savage, K., Verchot, L.V., Navarro, R. 2002 Minimizing artifacts and biases in chamber-based measurements of soil respiration Agric. Forest Meteorol. 113 21 37 CrossRef Google Scholar Villiers, M. 2000Water: The Fate of Our Most Precious Resource Houghton Mifflin Company Boston, MA, USA Google Scholar
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