Novel leaf-level measurements of chlorophyll fluorescence for photosynthetic efficiency
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Date
2015-11-12
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Citation of Original Publication
E. M. Middleton et al., "Novel leaf-level measurements of chlorophyll fluorescence for photosynthetic efficiency," 2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Milan, Italy, 2015, pp. 3878-3881, doi: 10.1109/IGARSS.2015.7326671.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
Solar induced chlorophyll fluorescence (SIF) from vegetation can now be obtained from satellites as well as ground-based field studies, at select wavelengths associated with atmospheric features. At the leaf level, full spectrum (650–800 nm) chlorophyll emissions (ChlF) can be measured using specialized instrumentation to support interpretation of these SIF observations. We found that ChlF spectra differ for leaf bottoms versus upper leaf surfaces, potentially affecting within-canopy radiative scattering. Our ChlF measurements for leaves of eight tree species (n≥125) obtained during fall 2013 senescence at the Duke Forest in North Carolina, USA and the 2014 growing season (n=72) at the USDA cornfield in Beltsville, MD, USA also demonstrate the benefit of acquiring measurements for both the Red and Far-Red emission peaks. The Red/Far-Red ChlF Ratio was strongly related to both the Photochemical Reflectance Index (PRI) for corn leaves (r≥0.76) and tree leaves (r≥0.89) and to a PSII Photosynthesis Efficiency parameter (r∼0.90).