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Use of vegetation indices to estimate intercepted solar radiation and net carbon dioxide exchange of a grass canopyResults are presented from field experiments relating spectral reflectance to intercepted photosynthetically active radiation (PAR) and net CO2 exchange in a natural canopy composed of the marsh cordgrass (Spartina alterniflora). Reflectance measurements made by a hand-held radiometer with Landsat TM spectral wavebands are used to compute remote sensing indices such as the normalized difference vegetation index. Consideration is given to the impact of standing dead canopy material on the relationship between intercepted PAR and spectral vegetation indices and the impact of changes in photosynthetic efficiency on the relationship between vegetation indices and CO2 exchange rates. The results suggest that quantitative remote assessment of photosynthesis and net gas exchange in natural vegetation is feasible, especially if the analysis incorporates information on biological responses to environmental variables.
Document ID
19900047007
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bartlett, David S.
(NASA Langley Research Center Hampton, VA, United States)
Whiting, Gary J.
(ST Systems Corp. Hampton, VA, United States)
Hartman, Jean M.
(Rutgers University New Brunswick, NJ, United States)
Date Acquired
August 14, 2013
Publication Date
November 1, 1989
Publication Information
Publication: Remote Sensing of Environment
Volume: 30
ISSN: 0034-4257
Subject Category
Earth Resources And Remote Sensing
Accession Number
90A34062
Distribution Limits
Public
Copyright
Other

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