title: Opaque closed chambers underestimate methane fluxes of Phragmites australis (Cav.) Trin. ex Steud.
abstract: Closed chamber measurements for methane emission estimation are often carried out with opaque chambers to avoid heating of the headspace. However, mainly in wetlands, some plants possess an internal convective gas transport which quickly responds to changes in irradiation. These plants have also been found to often channel a large part of the released methane in temperate fens. We compare methane fluxes derived from transparent versus opaque chambers on Carex-, Phragmites-, and Typha-dominated stands of a temperate fen. Transparent chamber fluxes almost doubled opaque chamber fluxes in the convective transporting Phragmites stand. In Typha, a trend of higher fluxes determined with the transparent chambers was detectable, whereas in Carex, transparent and opaque chamber fluxes did not differ significantly. Thus, opaque chambers bias the outcome of methane measurements, depending on dominant vegetation. We recommend the use of transparent chambers when determining emissions of convective plants or extrapolating fluxes to larger scales.
authors.affiliation: Landscape Ecology, Faculty of Agricultural and Environmental Sciences, University of Rostock, Justus-von-Liebig-Weg 6, 18059, Rostock, Germany, anke.guenther@uni-rostock.de.
authors.forename: Anke
authors.initials: A
authors.lastname: Günther
authors.forename: Gerald
authors.initials: G
authors.lastname: Jurasinski
authors.forename: Vytas
authors.initials: V
authors.lastname: Huth
authors.forename: Stephan
authors.initials: S
authors.lastname: Glatzel
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000378:metabolism; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D008697:Methane / Q000032:analysis* / Q000378:metabolism; D006109:Poaceae / Q000502:physiology*; D053833:Wetlands
chemical_list: D000393:Air Pollutants; D008697:Methane