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首页> 外文期刊>Remote Sensing of Environment: An Interdisciplinary Journal >DETECTION OF SOLAR-EXCITED CHLOROPHYLL A FLUORESCENCE AND LEAF PHOTOSYNTHETIC CAPACITY USING A FRAUNHOFER LINE RADIOMETER
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DETECTION OF SOLAR-EXCITED CHLOROPHYLL A FLUORESCENCE AND LEAF PHOTOSYNTHETIC CAPACITY USING A FRAUNHOFER LINE RADIOMETER

机译：氟霍夫线辐照度仪测定太阳能叶绿素荧光和叶的光合能力

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A Fraunhofer, Line Radiometer (FLR) measured solar excited chlorophyll a fluorescence (F) as an indicator of photosynthetic capacity in leaves of Washingtonia robusta (palm) and Vitis vinifera (grape). Under clear skies, the FLR utilized the Fraunhofer line-depth principle (FLDP) to detect F within the O-2 absorption band centered at 687 nm wavelength. On 20 April, the morning after soils were treated with the photosystem II herbicide DCMU, F increased significantly (p = 0.05) in palm, while Leaf reflectance at 687 nm (R) did not change. By 21 April, leaf herbicide concentrations were lethal. Increased F and R in palm corresponded with net photosynthetic rates near zero. Photosynthesis in grape also decreased greatly, but F and R remained similar to the controls. Results for palm indicate that F could be measured while leaves remained exposed to full sunlight, and support earlier work to indicate a potential role for the FLDP in remotely sensing F and photosynthetic capacity. [References: 19]
机译：弗劳恩霍夫线辐射计（FLR）测量了太阳激发的叶绿素a荧光（F），作为华盛顿州Washington（棕榈）和葡萄（葡萄）叶片中光合能力的指标。在晴朗的天空下，FLR利用Fraunhofer线深原理（FLDP）来检测以687 nm波长为中心的O-2吸收带内的F。 4月20日，即用光系统II除草剂DCMU处理土壤后的早晨，棕榈中的F显着增加（p = 0.05），而687 nm（R）处的叶片反射率没有变化。到4月21日，叶片除草剂的浓度已达到致命水平。棕榈中F和R的增加与净光合速率接近零相对应。葡萄中的光合作用也大大降低，但F和R仍与对照相似。棕榈的结果表明，可以在叶子仍然暴露于阳光直射的情况下测量F，并支持早期工作以表明FLDP在遥感F和光合能力方面的潜在作用。 [参考：19]

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