On the Covariation of Chlorophyll Fluorescence and Photosynthesis Across Scales
On the Covariation of Chlorophyll Fluorescence and Photosynthesis Across Scales
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DOI：
10.1029/2020gl091098
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发表时间：
2020-12
影响因子：
5.2
通讯作者：
T. Magney;M. Barnes;Xi Yang
中科院分区：
文献类型：
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作者：
T. Magney;M. Barnes;Xi Yang
由于在时空尺度上观察到 SIF 与总初级生产力 (GPP) 之间的线性关系，太阳诱导叶绿素荧光 (SIF) 遥感的最新进展引起了生物地球科学和地球系统科学界的广泛兴趣。 Maguire 等人最近的三项研究（2020，https://doi.org/10.1029/2020GL087858），He 等人。 （2020，https://doi.org/10.1029/2020GL087474），以及 Marrs 等人。 （2020，https://doi.org/10.1029/2020GL087956）强调了荧光和光化学产率之间的非线性关系，并提供了 SIF、气孔和光合作用碳反应解耦的经验证据。此类机制研究有助于加深我们对 SIF 是什么和不是什么的理解。我们认为，这些发现不一定与在卫星尺度上观察到的线性 SIF-GPP 关系相矛盾，并为荧光和光合作用在较小时空尺度上何时、何地以及为何发散提供了背景。了解遥感数据的尺度依赖性对于将 SIF 解释为 GPP 的代理至关重要。
Recent advances in remote sensing of solar‐induced chlorophyll fluorescence (SIF) have garnered wide interest from the biogeoscience and Earth system science communities, due to the observed linearity between SIF and gross primary productivity (GPP) at increasing spatiotemporal scales. Three recent studies, Maguire et al., (2020, https://doi.org/10.1029/2020GL087858), He et al. (2020, https://doi.org/10.1029/2020GL087474), and Marrs et al. (2020, https://doi.org/10.1029/2020GL087956) highlight a nonlinear relationship between fluorescence and photochemical yields and show empirical evidence for the decoupling of SIF, stomata, and the carbon reactions of photosynthesis. Such mechanistic studies help advance our understanding of what SIF is and what it is not. We argue that these findings are not necessarily contradictory to the linear SIF‐GPP relationship observed at the satellite scale and provide context for where, when, and why fluorescence and photosynthesis diverge at smaller spatiotemporal scales. Understanding scale dependencies of remote sensing data is crucial for interpreting SIF as a proxy for GPP.