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- W2124133456 abstract "ARTICLE IN PRESS Atmospheric Environment 40 (2006) 1759–1773 www.elsevier.com/locate/atmosenv Volatile organic compounds from vegetation in southern Yunnan Province, China: Emission rates and some potential regional implications Chris Geron a, , Sue Owen b , Alex Guenther c , Jim Greenberg c , Rei Rasmussen d , Jian Hui Bai e , Qing-Jun Li f , Brad Baker g a United States Environmental Protection Agency, National Risk Management Research Laboratory, Research Triangle Park, NC 27711, USA b Environmental Science, Lancaster University, London LA1 4YQ, UK c National Center for Atmospheric Research, Boulder, CO 80303, USA d Oregon Graduate Institute, Beaverton, OR 97006, USA e Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China f Chinese Academy of Sciences, Yunnan 650223, China g South Dakota School of Mines and Technology, Rapid City, SD 57701, USA Received 7 May 2005; received in revised form 1 November 2005; accepted 9 November 2005 Abstract Little information is currently available regarding emissions of biogenic volatile organic compounds (BVOCs) in southern Asia. To address the need for BVOC emission estimates in regional atmospheric chemistry simulations, 95 common plant species were screened for emissions of BVOC in and near the Xishuangbanna Tropical Biological Gardens in southern Yunnan Province, Peoples’ Republic of China in February 2003. In situ measurements with leaf cuvettes and branch bag enclosures were used in combination with portable gas chromatography, flame ionization, photoionization, and mass spectral detection to identify and quantify BVOC emissions. Forty-four of the species examined emitted isoprene at rates exceeding 20 mg C g 1 (leaf dry weight) h 1 . An emphasis was placed on the genus Ficus, which is important in the region and occupies a wide range of ecological niches. Several species in the footprint of a nearby flux tower were also examined. Several palm species and an abundant fern (Cyclosorus parasiticus) emitted substantial amounts of isoprene, and probably accounted for observed daytime mean isoprene fluxes from the understory of a Hevea brasiliensis plantation of 1.0 and 0.15 mg C m 2 h 1 during the wet and dry seasons, respectively. These measurements verify that both the forest floor and canopy in this region can be sources of isoprene. Monoterpene emissions exceeded 1.0 mg-C g 1 (leaf dry weight) h 1 from only 4 of 38 species surveyed, including some Ficus species and H. brasiliensis. However most of the trees of the latter species were sparsely foliated due to dry season senescence, and emission factors are approximately an order of magnitude lower than those reported during the wet season. BVOC emission rates and physiology of many species are impacted by reduced moisture availability, especially Mangifera indica. South Asia is a region undergoing rapid landuse change and forest plantation establishment, with large increases in area of high BVOC-emitting species in the genera Bambusa, Elaeis, Eucalyptus, Hevea, Pinus, and Populus (among others). This could result in profound changes in atmospheric chemistry in these regions, for instance, terpene emissions from H. brasiliensis could increase wet season biogenic organic aerosol burdens by approximately a factor of 2 in the Xishuangbanna region. Increases in plantation area Corresponding author. Tel.: +1 919 541 4639; fax: +1 919 541 7885. E-mail address: geron.chris@epa.gov (C. Geron). 1352-2310/$ - see front matter r 2005 Elsevier Ltd. All rights reserved. doi:10.1016/j.atmosenv.2005.11.022" @default.
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- W2124133456 title "Volatile organic compounds from vegetation in southern Yunnan Province, China: Emission rates and some potential regional implications" @default.
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