Submitted to: Remote Sensing of Environment
Publication Type: Abstract Only
Publication Acceptance Date: October 22, 2000
Publication Date: August 22, 2000
Multitemporal AVHRR NDVI and climate data were used to estimate net ecosystem fluxes for coniferous forest, sagebrush steppe, mixed-grass prairie, and agricultural landscapes in southeastern Wyoming. Predicted uptake was compared to net carbon dioxide flux data obtained over the landscapes from aircraft eddy flux measurements. The fluxes agreed for the forest, steppe, and prairie landscapes, but not for the agricultural landscape. Analysis of AVIRIS and Landsat 7 ETM+ data show the three landscapes with native vegetation to be relatively homogeneous. For the agricultural landscape, large fields of dryland wheat and pasture dominated the fluxes early in the season, whereas small fields of irrigated crops and hay dominated the fluxes later in the season, which caused errors in the remotely-sensed estimates from the large pixel sizes of AVHRR. Spatial databases of irrigated and non-irrigated crop land cover will be important for remotely sensed estimates of carbon sequestration.