FLEX/Sentinel-3 Tandem Mission Photosynthesis Study – An investigation of steady-state chlorophyll fluorescence and photosynthesis in terrestrial vegetation-猫眼课题宝

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2014-04

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G. Mohammed;A. Ač;F. Daumard;M. Drusch;A. Gallé;Y. Goulas;F. Magnani;Z. Malenovský;J. Moreno;J. Olejnícková;D. Pernokis;J. P. Rivera;J. Verrelst;C. Rascher;C. Tol;W. Verhoef;A. Volta

荧光探测器（FLEX）将是第一次空间使命，其目的是对陆地植被中太阳引起的稳态叶绿素荧光进行远程观测。在欧洲航天局的A/B1阶段评估中，光合作用研究考虑了SIF量化光合作用的潜力，并评估了植被健康和压力状况。本报告对这项研究的主要内容和主要结论作了广泛的概述。这项研究有两个组成部分：第一个部分开发了一个基于过程的模型，将稳态荧光产量与光合作用定量联系起来;另一个部分评估了稳态荧光作为植被生理压力指标的潜力，而不需要计算光合速率。这种双重方法确保了在空间使命中可以利用荧光信号的全部能力。建模活动集成了代表分子、叶片和冠层水平生理过程的最先进模块，以支持自动范围（A-SCOPE）工具。SCOPE -土壤冠层观测、光合作用能量通量模型，最初由C。货车德尔托尔和同事-链接冠层顶部的辐射观测与陆地表面的过程，并包括专门用于叶绿素荧光的模块。A-SCOPE是一个新的图形用户界面软件包，它提供了运行SCOPE所需的输入和输出之间的无缝链接。SCOPE模型扩展到包括新的功能和特征，如C3和C4物种的新叶生化程序。输出包括荧光和反射光谱等产品。对于研究的另一个主要组成部分-使用SIF在压力检测-我们专注于由水分亏缺，低温或高温极端，和营养（氮）不足引起的植物压力。一个随机效应的荟萃分析进行被动（solarinduced）和主动（激光诱导）测量叶绿素荧光检测应力效应的研究。水分胁迫往往会产生下降的红色和远红外荧光在叶片和冠层水平。温度胁迫最明显的指标是红色荧光与远红色荧光的比率，即使结合低温和高温胁迫测量，该比率也持续下降。该比值也是氮的有效指标

The FLuorescence EXplorer (FLEX) would be the first space mission optimised for remote observation of steady-state, solar-induced chlorophyll fluorescence (SIF) in terrestrial vegetation. Within the European Space Agency’s Phase A/B1 assessment, the Photosynthesis Study considers the potential of SIF for quantifying photosynthesis, and assessing vegetation health and stress status. This report is a broad overview of the main elements and key findings of this study. The study has two components: The first developed a process-based model to quantitatively link steady-state fluorescence yield to photosynthesis; the other component evaluated the potential of steady-state fluorescence as an indicator of vegetation physiological stress, without requiring calculation of photosynthetic rates. This dual approach ensures that the full range of capabilities of the fluorescence signal might be exploited in a spaceborne mission. The modelling activity integrated state-of-the-art modules representative of physiological processes at the molecular, leaf, and canopy levels to feed the Automated SCOPE (A-SCOPE) tool. SCOPE – the Soil Canopy Observation, Photosynthesis Energy fluxes model, originally developed by C. van der Tol and colleagues – links top of canopy observations of radiance with land surface processes, and includes modules dedicated to chlorophyll fluorescence. A-SCOPE is a new Graphic User Interface software package that provides a seamless link between inputs and outputs required for running SCOPE. The SCOPE model was expanded to include novel functionalities and features, such as new leaf biochemical routines for C3 and C4 species. Outputs include fluorescence and reflectance spectra, among other products. For the other major component of the study – the use of SIF in stress detection – we focused on the stresses of plants induced by water deficit, low or high temperature extremes, and nutrient (nitrogen) insufficiency. A random-effects meta-analysis was done for studies of passively (solarinduced) and actively (laser-induced) measured chlorophyll fluorescence in detecting stress effects. Water stress tended to produce a decline in red and farred fluorescence at leaf and canopy levels. The clearest indicator of temperature stress was the ratio of red to far-red fluorescence, which declined consistently even when combining chilling and heat stress measurements. The ratio was also an effective indicator of nitrogen

FLEX/Sentinel-3 Tandem Mission Photosynthesis Study – An investigation of steady-state chlorophyll fluorescence and photosynthesis in terrestrial vegetation

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