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首页> 外文期刊>Ecological research >Microsite variation in light availability and photosynthesis in a cool-temperate deciduous broadleaf forest in central Japan
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Microsite variation in light availability and photosynthesis in a cool-temperate deciduous broadleaf forest in central Japan

机译：日本中部低温温带落叶阔叶林中光利用率和光合作用的微点变化

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An empirical light simulation model was applied to estimate stand scale photosynthesis in a deciduous broadleaved forest in central Japan. Based on diurnal courses of photosynthetically active photon flux density (PPFD), we characterized the components of incoming light within the forest canopy, and found that the instantaneous relative PPFD (PPFD under the canopy relative to that above the canopy) under diffuse light condition was a reliable estimator of the intensity and duration of PPFD. We calculated the daily photosynthesis (A_(day)) for each PPFD class using photosynthesis-light response curves. Model simulated A_(day) were corroborated with the estimates obtained from the nearby CO_2 flux tower. The result demonstrated the potential of the light simulation model. The light use efficiency of two dominant species, Betula ermanii as overstory and Sasa senanensis as understory species, were then evaluated. At the forest understory, PPFD under 50 μmol m~(-2) s~(-1) contributed to 77% of the sunshine duration on a completely clear day. Therefore, a higher apparent quantum yield for S. senanensis enhanced the utilization of low PPFD for photosynthesis. On the other hand, at the upper forest canopies, B. ermanii with a higher light-saturated photosynthetic rate used high PPFD efficiently. Consequently, potential of daily net photosynthesis for both B. ermanii and S. senanensis was high under each light condition. Such interspecific difference in the patterns of light utilization was suggested as one of factors allowing coexistence of the two species in the study forest.
机译：应用经验光模拟模型来估计日本中部落叶阔叶林林分尺度的光合作用。基于光合有效光子通量密度（PPFD）的日变化过程，我们对森林冠层内入射光的成分进行了表征，发现在散射光条件下瞬时相对PPFD（冠层下的PPFD相对于冠层上的PPFD）为PPFD强度和持续时间的可靠估算器。我们使用光合作用-光响应曲线计算了每个PPFD类的每日光合作用（A_（天））。通过从附近的CO_2通量塔获得的估计值证实了模型模拟的A_（天）。结果证明了光仿真模型的潜力。然后评估了两种优势种的光利用效率，即桦（Betula ermanii）为上层种，而印度红麻（Sasa senanensis）为下层种。在林下，在完全晴天，PPFD在50μmolm〜（-2）s〜（-1）以下贡献了77％的日照时间。因此，较高的表观量子产量可提高山核桃的光合作用。另一方面，在较高的森林冠层，光饱和光合速率较高的B. ermanii有效利用了高PPFD。因此，在每种光照条件下，德国曼氏芽孢杆菌和塞纳曼链霉菌的每日净光合作用潜力都很高。这种光利用模式的种间差异被认为是允许这两种物种在研究森林中共存的因素之一。

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