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dc.contributor.authorPumpanen, Jukka-
dc.contributor.authorKolari, Pasi-
dc.contributor.authorIlvesniemi, Hannu-
dc.contributor.authorMinkkinen, Kari-
dc.contributor.authorVesala, Timo-
dc.contributor.authorNiinistö, Sini-
dc.contributor.authorLohila, Annalea-
dc.contributor.authorLarmola, Tuula-
dc.contributor.authorMorero, Micaela-
dc.contributor.authorPihlatie, Mari-
dc.contributor.authorJanssens, Ivan-
dc.contributor.authorYuste, Jorge Curiel-
dc.contributor.authorGrunzweig, Jose M-
dc.contributor.authorReth, Sascha-
dc.contributor.authorSubke, Jens-Arne-
dc.contributor.authorSavage, Kathleen-
dc.contributor.authorKutsch, Werner-
dc.contributor.authorOstreng, Geir-
dc.contributor.authorZiegler, Waldemar-
dc.contributor.authorAnthoni, Peter-
dc.contributor.authorLindroth, Anders-
dc.contributor.authorHari, Pertti-
dc.description.abstractTwenty chambers for measurement of soil CO2 efflux were compared against known CO2 fluxes ranging from 0.32 to 10.01 molCO2 m−2 s−1 and generated by a specially developed calibration tank. Chambers were tested on fine and coarse homogeneous quartz sand with particle sizes of 0.05–0.2 and 0.6 mm, respectively. The effect of soil moisture on chamber measurementswas tested by wetting the fine quartz sand to about25%volumetricwater content. Non-steady-state through-flow chambers either underestimated or overestimated fluxes from−21 to+33% depending on the type of chamber and the method of mixing air within the chamber’s headspace. However, when results of all systems tested were averaged, fluxes were within 4% of references. Non-steady-state on-through-flow chambers underestimated or overestimated fluxes from –35 to +6%.On average, the underestimation was about 13–14% on fine sand and 4% on coarse sand. When the length of the measurement period was increased, the underestimation increased due to the rising concentration within the chamber headspace, which reduced the diffusion gradient within the soil. Steady-state through-flow chambers worked almost equally well in all sand types used in this study. They overestimated the fluxes on average by 2–4%. Overall, the reliability of the chambers was not related to the measurement principle per se. Even the same chambers, with different collar designs, showed highly variable results. The mixing of air within the chamber can be a major source of error. Excessive turbulence inside the chamber can cause mass flow of CO2 from the soil into the chamber. The chamber headspace concentration also affects the flux by altering the concentration gradient between the soil and the chamber.en_UK
dc.publisherElsevier Masson-
dc.relationPumpanen J, Kolari P, Ilvesniemi H, Minkkinen K, Vesala T, Niinistö S, Lohila A, Larmola T, Morero M, Pihlatie M, Janssens I, Yuste JC, Grunzweig JM, Reth S, Subke J, Savage K, Kutsch W, Ostreng G, Ziegler W, Anthoni P, Lindroth A & Hari P (2004) Comparison of different chamber techniques for measuring soil CO2 efflux, Agricultural and Forest Meteorology, 123 (3-4), pp. 159-176.-
dc.rightsThe publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author; you can only request a copy if you wish to use this work for your own research or private study.-
dc.subjectSoil CO2 effluxen_UK
dc.subject.lcshCarbon dioxide-
dc.subject.lcshEnvironmental Studies-
dc.subject.lcshAtmospheric carbon dioxide Environmental aspects.-
dc.subject.lcshSoil respiration-
dc.titleComparison of different chamber techniques for measuring soil CO2 effluxen_UK
dc.typeJournal Articleen_UK
dc.rights.embargoreasonThe publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work.-
dc.citation.jtitleAgricultural and Forest Meteorology-
dc.type.statusPublisher version (final published refereed version)-
dc.contributor.affiliationUniversity of Helsinki-
dc.contributor.affiliationUniversity of Helsinki-
dc.contributor.affiliationUniversity of Helsinki-
dc.contributor.affiliationUniversity of Helsinki-
dc.contributor.affiliationUniversity of Helsinki-
dc.contributor.affiliationUniversity of Joensuu-
dc.contributor.affiliationFinnish Meteorological Institute-
dc.contributor.affiliationUniversity of Joensuu-
dc.contributor.affiliationUniversity of Joensuu-
dc.contributor.affiliationUniversity of Helsinki-
dc.contributor.affiliationUniversity of Antwerp-
dc.contributor.affiliationUniversity of Antwerp-
dc.contributor.affiliationWeizmann Institute of Science-
dc.contributor.affiliationUniversity of Bayreuth-
dc.contributor.affiliationBiological and Environmental Sciences-
dc.contributor.affiliationWoods Hole Research Center-
dc.contributor.affiliationUniversity of Kiel-
dc.contributor.affiliationNorsk Institutt for Skogforskning-
dc.contributor.affiliationMax-Planck-Institute for Biogeochemistry, Germany-
dc.contributor.affiliationMax-Planck-Institute for Biogeochemistry, Germany-
dc.contributor.affiliationLund University-
dc.contributor.affiliationUniversity of Helsinki-
Appears in Collections:Biological and Environmental Sciences Journal Articles

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