Physics – Optics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3612403z&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 12, CiteID L12403
Physics
Optics
Biogeosciences: Remote Sensing, Biogeosciences: Water/Energy Interactions (1878), Biogeosciences: Bio-Optics
Scientific paper
Non-destructive estimation of leaf water content provides vital information about vegetation productivity. We report here on controlled seven day experiments using greenhouse-grown maize. Fifty plants were randomly assigned to two equal groups: water stressed and well watered. Spectroscopic, relative water content (RWC), and chlorophyll concentration measurements were made daily. Because water molecules absorb radiation in near- and middle-infrared, most efforts to sense water deficit remotely utilize infrared wavelengths. In these experiments, we identified a strong, systematic, and repeatable relationship between photosynthetically active radiation (PAR, 400-700 nm) albedo and leaf RWC. We show that visible spectrum reflectance provides a means to detect early stages of plant stress and estimate leaf RWC.
Arkebauer Timothy J.
Gitelson Anatoly A.
Rundquist Donald C.
Zygielbaum Arthur I.
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