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首页> 外文期刊>Atmospheric environment >Impact of diffuse light on isoprene and monoterpene emissions from a mixed temperate forest
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Impact of diffuse light on isoprene and monoterpene emissions from a mixed temperate forest

机译：漫射光对混合温带森林中异戊二烯和单萜排放的影响

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摘要

This study investigated the impact of diffuse light on canopy scale emission of isoprene and mono-terpenes measured continuously above a mixed temperate forest, using the disjunct eddy-covariance by mass scanning technique with a proton transfer reaction-mass spectrometer (PTR-MS) instrument. To assess this impact, the relationship between emissions/radiation and emissions/gross primary production (GPP) under clear sky and cloudy conditions were analysed. Under cloudy conditions (high proportion of diffuse radiation), the isoprene and monoterpene fluxes were enhanced compared to clear sky conditions (low proportion of diffuse radiation) at equivalent temperature and above-canopy total radiation. The whole-canopy enzymatic activity of the metabolic isoprene production pathway, however, was suggested to be lower under cloudy conditions than under clear sky conditions at equivalent temperature. The mechanisms behind these observations are probably linked to the better penetration of diffuse radiation in the canopy. Shade leaveseedles receive more radiation in cloudy conditions than in clear sky conditions, thereby inducing the observed effects.
机译：这项研究使用质子转移反应质谱仪（PTR-MS）通过质量扫描分离涡度协方差研究了混合温带森林上连续测量的散射光对异戊二烯和单萜冠层尺度排放的影响。为了评估这种影响，分析了晴朗天空和多云条件下的排放/辐射与排放/总初级生产（GPP）之间的关系。在多云的条件下（扩散辐射的比例很高），与晴空条件下（等效辐射和顶棚总辐射量以上）的晴空条件（扩散辐射的比例低）相比，异戊二烯和单萜的通量得到了增强。但是，在等效温度下，在多云的条件下，代谢异戊二烯生产途径的全冠酶活性要低于晴天。这些观察结果背后的机制可能与顶篷中散射辐射的更好穿透有关。在阴天条件下，遮荫树叶/针叶比在晴朗的天空条件下接受更多的辐射，从而引起观察到的效果。

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  • 来源
    《Atmospheric environment》 |2013年第8期|385-392|共8页
  • 作者

    Q. Laffineur; M. Aubinet; N. Schoon; C. Amelynck; J.-F. Muller; J. Dewulf; K. Steppe; B. Heinesch;

  • 作者单位

    Unite de Physique des Biosystemes, Gembloux Agro-Bio Tech, University of Liege, Avenue de la Faculte d'Agronomie 8, 5030 Gembloux, Belgium;

    Unite de Physique des Biosystemes, Gembloux Agro-Bio Tech, University of Liege, Avenue de la Faculte d'Agronomie 8, 5030 Gembloux, Belgium;

    Belgian Institute for Space Aeronomy, Ringlaan-3-Avenue Circulaire, 1180 Brussels, Belgium;

    Belgian Institute for Space Aeronomy, Ringlaan-3-Avenue Circulaire, 1180 Brussels, Belgium;

    Belgian Institute for Space Aeronomy, Ringlaan-3-Avenue Circulaire, 1180 Brussels, Belgium;

    Research Group Environmental Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653,9000 Gent, Belgium;

    Laboratory of Plant Ecology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium;

    Unite de Physique des Biosystemes, Gembloux Agro-Bio Tech, University of Liege, Avenue de la Faculte d'Agronomie 8, 5030 Gembloux, Belgium;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Forest ecosystems; Monoterpenes; Isoprene; Disjunct eddy-covariance; PTR-MS;

    机译：森林生态系统;单萜;异戊二烯;分离涡-协方差;点对点质谱;

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