Red and far red Sun-induced chlorophyll fluorescence as a measure of plant photosynthesis
Red and far red Sun-induced chlorophyll fluorescence as a measure of plant photosynthesis
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DOI：
10.1002/2014gl062943
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发表时间：
2015-03-28
影响因子：
5.2
通讯作者：
Rascher, U.
中科院分区：
文献类型：
--
作者：
Rossini, M.;Nedbal, L.;Rascher, U.
对陆地植被发出的太阳诱导叶绿素荧光进行遥感估算，可以为跟踪光合效率的时空变化提供前所未有的机会。在这里，我们提供了第一个直接的实验证据表明，叶绿素荧光光谱的两个峰值可以准确地映射从高分辨率辐射光谱和信号的实际光合效率的变化。红色和远红荧光测量使用一种新的机载成像光谱仪在用已知抑制光合作用的除草剂处理过的草地毯显着高于相应的信号，从一个相当的未处理的草地毯。两个草毯的反射信号是不可区分的，证实了荧光发射的快速动态变化与除草剂应用引起的实际光合作用的功能状态的变化有关。我们的结果，在当地规模的控制实验说明了潜在的全球地图的陆地光合作用，通过航天器上的叶绿素荧光测量。
Remote estimation of Sun-induced chlorophyll fluorescence emitted by terrestrial vegetation can provide an unparalleled opportunity to track spatiotemporal variations of photosynthetic efficiency. Here we provide the first direct experimental evidence that the two peaks of the chlorophyll fluorescence spectrum can be accurately mapped from high-resolution radiance spectra and that the signal is linked to variations in actual photosynthetic efficiency. Red and far red fluorescence measured using a novel airborne imaging spectrometer over a grass carpet treated with an herbicide known to inhibit photosynthesis was significantly higher than the corresponding signal from an equivalent untreated grass carpet. The reflectance signal of the two grass carpets was indistinguishable, confirming that the fast dynamic changes in fluorescence emission were related to variations in the functional status of actual photosynthesis induced by herbicide application. Our results from a controlled experiment at the local scale illustrate the potential for the global mapping of terrestrial photosynthesis through space-borne measurements of chlorophyll fluorescence.