Photosynthesis and stomatal conductance related to reflectance on the canopy scale

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Remote Sensing of Environment; (United States)

DOI:https://doi.org/10.1016/0034-4257(93)90106-8· OSTI ID:6777850

Verma, S B; Kim, J ^[1]; Sellers, P J; Hall, F G; Goetz, S J ^[2]; Walthall, C L ^[3]

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1. Univ. of Nebraska, Lincoln (United States)
2. NASA, Greenbelt, MD (United States)
3. Univ. of Maryland, College Park (United States)

Field measurements of carbon dioxide and water vapor fluxes were analyzed in conjunction with reflectances obtained from a helicopter-mounted Modular Multiband Radiometer (MMR) at a grassland study site during the First ISLSCP (International Satellite Land Surface Climatology Project) Field Experiment (FIFE). These measurements are representative of the canopy scale and were made over a range of meteorological and soil moisture conditions during different stages in the annual life cycle of the prairie vegetation, and thus provide a good basis for investigating hypotheses/relationships potentially useful in remote sensing applications. The authors tested the hypothesis (Sellers, 1987) that the simple ratio vegetation index (SR) should be near-linearly related to the derivatives of the unstressed canopy stomatal conductance (g[sub c]*) and the unstressed canopy photosynthesis (P[sub c]*) with respect to photosynthetically active radiation (PAR). Even though there is some scatter in the data, the results seem to support this hypothesis. Further investigation, however, is needed before such relationships can be employed in satellite remote sensing applications.

• OSTI ID: 6777850
• Journal Information: Remote Sensing of Environment; (United States), Journal Name: Remote Sensing of Environment; (United States) Vol. 44:1; ISSN RSEEA7; ISSN 0034-4257
• Country of Publication: United States
• Language: English

Related Subjects

29 ENERGY PLANNING, POLICY, AND ECONOMY
290301 -- Energy Planning & Policy-- Environment
Health
& Safety-- Regional & Global Environmental Aspects-- (1992-)
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AERIAL MONITORING
CANOPIES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
FLUIDS
GASES
MEASURING INSTRUMENTS
MONITORING
OPENINGS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
RADIATION DETECTORS
RADIOMETERS
REMOTE SENSING
STOMATA
SYNTHESIS
VAPORS
WATER VAPOR