Leaf-level chlorophyll fluorescence and reflectance spectra of high latitude plants
Leaf-level chlorophyll fluorescence and reflectance spectra of high latitude plants
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高纬度植物叶级叶绿素荧光和反射光谱
DOI：
10.1088/2515-7620/ac5365
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发表时间：
2022
影响因子：
2.9
通讯作者：
Middleton, Elizabeth
中科院分区：
文献类型：
--
作者：
Huemmrich, K Fred;Campbell, Petya;Vargas Z, Sergio A;Sackett, Sarah;Unger, Steven;May, Jeremy;Tweedie, Craig;Middleton, Elizabeth
高纬度植物叶绿素荧光光谱的研究较少。利用FluoWat叶片夹测量了常见高纬度植物叶片的叶片水平反射率和叶绿素荧光光谱，以研究这些物种的一般光谱特征。荧光产率（F产率）计算为对于从400 nm到FluoWat低通滤光器的截止波长（650或700 nm）的波长，发射的荧光除以吸收的辐射的比率。不同植物功能类型的F产量谱具有明显的差异。黑云杉（Picea mariana）Fyield光谱中几乎没有红色荧光，但有一个明显的远红峰，红色荧光在地上部被重吸收。颤白杨（Populus tremuloides）和甜款冬（Petasites frigidus）都有很高的红色和远红色的F峰。棉花草（Eriophorum spp.）具有红色和远红色的Fyield峰，但这些峰远低于白杨或款冬。泥炭藓（Sphagnum spp.）具有明显的Fyield红色峰，但远红荧光较低。驯鹿苔藓地衣（Cladonia rangiferina）的荧光水平非常低，尽管潮湿时显示出一个红色的F屈服峰。这些高纬度植被样本显示出广泛的变化，在Fyield光谱形状。单个红色或远红色峰的F产量值与叶绿素含量的相关性较差，但远红色与红色F产量的比值与叶绿素含量的相关性较强。这些植物的光谱变化可以提供信息的植被类型的遥感，但也可能混淆尝试测量高纬度植被生物物理特性和功能，使用太阳诱导荧光（SIF）。
Little is known about the chlorophyll fluorescence spectra for high latitude plants. A FluoWat leaf clip was used to measure leaf-level reflectance and chlorophyll fluorescence spectra of leaves of common high latitude plants to examine general spectral characteristics of these species. Fluorescence yield (Fyield) was calculated as the ratio of the emitted fluorescence divided by the absorbed radiation for the wavelengths from 400 nm up to the wavelength of the cut-off for the FluoWat low pass filter (either 650 or 700 nm). The Fyield spectra grouped into distinctly different patterns among different plant functional types. Black spruce (Picea mariana) Fyield spectra had little red fluorescence, which was reabsorbed in the shoot, but displayed a distinct far-red peak. Quaking aspen (Populus tremuloides) had both high red and far-red Fyield peaks, as did sweet coltsfoot (Petasites frigidus). Cotton grass (Eriophorum spp.) had both red and far-red Fyield peaks, but these peaks were much lower than for aspen or coltsfoot. Sphagnum moss (Sphagnum spp.) had a distinct Fyield red peak but low far-red fluorescence. Reindeer moss lichen (Cladonia rangiferina) had very low fluorescence levels, although when damp displayed a small red Fyield peak. These high latitude vegetation samples showed wide variations in Fyield spectral shapes. The Fyield values for the individual red or far-red peaks were poorly correlated to chlorophyll content, however the ratio of far-red to red Fyield showed a strong correlation with chlorophyll content. The spectral variability of these plants may provide information for remote sensing of vegetation type but may also confound attempts to measure high latitude vegetation biophysical characteristics and function using solar induced fluorescence (SIF).
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