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首页> 外文期刊>Ecological research >Determination of the gas exchange phenology in an evergreen coniferous forest from 7 years of eddy covariance flux data using an extended big-leaf analysis
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Determination of the gas exchange phenology in an evergreen coniferous forest from 7 years of eddy covariance flux data using an extended big-leaf analysis

机译：利用扩展大叶分析从7年的涡度协方差通量数据确定常绿针叶林中气体交换物候

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摘要

We defined gas exchange phenology as the seasonality of the gas exchange characteristics of a forest canopy, and investigated how the gas exchange phenology could be directly detected from an eddy covariance (EC) dataset and its influence on the canopy fluxes within an evergreen Japanese cypress forest. For the detection of gas exchange phenology, we derived three bulk parameters of the extended big-leaf model (Kosugi et al. 2005) inversely from EC flux data over a 7-year period: surface conductance (g_c), maximum rate of carboxylation of the "big leaf (V_(Cmax)), and intercellular CO_2 concentration of the "big leaf (C_I). The relationship between g_c and the vapor pressure deficit declined in winter and spring. The relationship between the daily ecosystem respiration and air temperature was greater in the spring than in the other seasons. The temperature dependence curve of V_(cmax) decreased substantially in the winter and was different from that of an evergreen broadleaved forest. A decrease in Q was occasionally coupled with the decrease in canopy gross primary production during April and August, indicating that stomatal closure was responsible for a decline in canopy photosynthesis. Gas exchange phenology should be quantified when understanding the determining factors of the seasonality of canopy fluxes at evergreen coniferous forests.
机译：我们将气体交换物候学定义为林冠层气体交换特征的季节性，并研究了如何直接从涡动协方差（EC）数据集中检测到气体交换物候及其对常绿日本柏树森林中冠层通量的影响。 。为了检测气体交换物候，我们从7年的EC通量数据中反推导出了扩展大叶模型的三个总体参数（Kosugi et al.2005）：表面电导（g_c），最大羧基化率“大叶（V_（Cmax））”和“大叶（C_I）的细胞间CO_2浓度。在冬季和春季，g_c和蒸气压亏空之间的关系下降。春天的日常生态系统呼吸与气温之间的关系比其他季节都大。 V_（cmax）的温度依赖性曲线在冬季显着下降，并且不同于常绿阔叶林。在4月和8月间，Q值的下降有时与冠层总初级产量的下降有关，这表明气孔关闭是冠层光合作用下降的原因。了解常绿针叶林冠层通量季节性的决定因素时，应量化气体交换物候。

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  • 来源
    《Ecological research》 |2013年第3期|373-385|共13页
  • 作者

    Yoshiko Kosugi; Satoru Takanashi; Masahito Ueyama; Shinjiro Ohkubo; Hiroki Tanaka; Kazuho Matsumoto; Natsuko Yoshifuji; Mioko Ataka; Avaka Sakabe;

  • 作者单位

    Laboratory of Forest Hydrology, Division of EnvironmentalScience and Technology, Graduate School of Agriculture,Kyoto University, Kyoto 606-8502, Japan;

    Department of Meteorological Environment,Forestry and Forest Products Research Institute,Tsukuba, Ibaraki 305-8687, Japan;

    Graduate School of Life and Environmental Sciences,Osaka Prefecture University, Sakai, Osaka 599-8351, Japan;

    NARO Hokkaido Agricultural Research Center, Sapporo 062-8555, Japan;

    Laboratory of Forest Hydrology, Division of EnvironmentalScience and Technology, Graduate School of Agriculture,Kyoto University, Kyoto 606-8502, Japan;

    Faculty of Agriculture, University of the Ryukyus, Okinawa 903-0213, Japan;

    Laboratory of Forest Hydrology, Division of EnvironmentalScience and Technology, Graduate School of Agriculture,Kyoto University, Kyoto 606-8502, Japan;

    Laboratory of Forest Hydrology, Division of EnvironmentalScience and Technology, Graduate School of Agriculture,Kyoto University, Kyoto 606-8502, Japan;

    Laboratory of Forest Hydrology, Division of EnvironmentalScience and Technology, Graduate School of Agriculture,Kyoto University, Kyoto 606-8502, Japan;

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  • 正文语种 eng
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  • 关键词

    Evergreen conifer; Phenology; Eddy covariance; Canopy conductance; V(Cmax);

    机译：常绿针叶树;物候学涡度协方差天篷电导;V（最大）;

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