Mapping regional forest evapotranspiration and photosynthesis by coupling satellite data with ecosystem simulation

Annual evapotranspiration (ET) and net photosynthesis (PSN) were estimated for a mountainous 28 x 55 km region of predominantly coniferous forests in western Montana. A simple geographic information system integrated topographic, soils, vegetation, and climate data at a 1.1-km scale defined by the s...

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Bibliographic Details
Published in:Ecology (Durham) 1989-08, Vol.70 (4), p.1090-1101
Main Authors: Running, Steven W., Nemani, Ramakrishna R., Peterson, David L., Band, Larry E., Potts, Donald F., Pierce, Lars L., Spanner, Michael A.
Format: Article
Language:English
Subjects:
Advanced very high resolution radiometers
Animal, plant and microbial ecology
Artificial satellites
Biological and medical sciences
BOSQUE DE CONIFERAS
CARTOGRAFIA
CARTOGRAPHIE
CARTOGRAPHY
Climate models
CONIFEROUS FORESTS
ECOLOGIA FORESTAL
ECOLOGIE FORESTIERE
Ecology
ECOSISTEMA
Ecosystem models
ECOSYSTEME
ECOSYSTEMS
EVAPOTRANSPIRACION
EVAPOTRANSPIRATION
FOREST ECOLOGY
Forest ecosystems
Forest soils
Forests
FORET RESINEUSE
FOTOSINTESIS
Fundamental and applied biological sciences. Psychology
General aspects. Techniques
LEAF AREA
MODELE
MODELOS
MONTANA
PHOTOSYNTHESE
PHOTOSYNTHESIS
REMOTE SENSING
SUPERFICIE FOLIAR
SURFACE FOLIAIRE
TELEDETECCION
TELEDETECTION
Teledetection and vegetation maps
Vegetation
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Summary:Annual evapotranspiration (ET) and net photosynthesis (PSN) were estimated for a mountainous 28 x 55 km region of predominantly coniferous forests in western Montana. A simple geographic information system integrated topographic, soils, vegetation, and climate data at a 1.1-km scale defined by the satellite sensor pixel size. Leaf area index (LAI) of the forest was estimated with data from the NOAA (National Oceanic and Atmospheric Administration) Advanced Very High Resolution Radiometer (AVHRR). Daily microclimate of each cell was estimated from ground and satellite data and interpolated using MT-CLIM, a mountain microclimate simulator. A forest ecosystem simulation model, Forest-BGC, was used to calculate ET and PSN daily for each cell. Ranges of estimated LAI (4-15), ET (25-60 cm/yr), and PSN (9-20 Mg@?ha^-^1@?yr^-^1) across the landscape follow the trends expected in both magnitude and spatial pattern. These estimates compared well with field measurements of related variables, although absolute validation of these predictions is not possible at large spatial scales.
ISSN:0012-9658
1939-9170
DOI:10.2307/1941378