Volatile organic compound emission rates from mixed deciduous and coniferous forests in Northern Wisconsin, USA

摘要: Biogenic emissions of volatile organic compounds {VOC) from forests play an important role in regulating the atmospheric trace gas composition including global tropospheric ozone concentrations. However, more information is needed on VOC emission rates different forest regions world to understand regional and impacts implement possible mitigation strategies. The mixed deciduous coniferous northern Wisconsin, USA were predicted have significant because they are comprised many genera (i.e. Picea, Populus, Quercus, Salix) known be high emitters. In July 1993, a study was conducted Chequamegon National Forest near Rhinelander, WI identify quantify emitted major trees, shrubs, understory herbs this region. Emission measured at various scales -at leaf level with cuvettes, branch enclosures, canopy tower based system, landscape tethered balloon air sampling system. Area-average estimated by scaling, using biomass densities species along transects representative site. Isoprene (C5H8) primary emitted, although quantities monoterpenes (C10H16) also emitted. highest isoprene (at 30C photosynthetically active radiation 1000 umolm-2s-1) red oak (Quercus rubra. > 110 ug(C)g-1h-1): aspen (Populus tremuloides. 77): willow (Salix spp.. 54): black spruce (Picea mariamz. 101. hybrid poplar clones ranged 40 90 ug(C)g-1h-1 25C: those Picea provenances generally