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Title: ASSESSMENT OF ECOSYSTEM NET CARBON FLUX DATA BY LONG-TERM CHANGES OF LANDSAT MSS AND LANDSAT 7 ETM+ IMAGERY

Author
item Hunt Jr, Earle
item KELLY, ROBERT - UNIVERSITY OF WYOMING
item FAHNESTOCK, J - UNIVERSITY OF WYOMING
item MIYAKE, BRIAN - UNIVERSITY OF WYOMING
item SMITH, W - WAKE FOREST UNIVERSITY
item WELKER, J - UNIVERSITY OF WYOMING
item REINERS, W - UNIVERSITY OF WYOMING

Submitted to: American Society for Photogrammetry and Remote Sensing Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 9/13/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Net ecosystem carbon fluxes were measured, using ground and aircraft data, for a mixed-grass prairie site and a sagebrush steppe site in southeastern Wyoming. We determined that the sagebrush site was net-sink of carbon, whereas, the grassland site was in approximate carbon balance. We tested the hypothesis that previous land-use/land cover change may be responsible for current carbon fluxes by examining Landsat MSS and current Landsat 7 ETM+ images. For these ecosystems, vegetation strongly responds to climate, so Landsat NDVI data were corrected for differences in timing and amount of precipitation using a model developed with AVHRR NDVI data. Landsat NDVI based on years (1999 + 1992) - (1983 + 1973) showed that 81 percent of the pixels in the sagebrush study area increased over time, whereas, 73 percent of the pixels in the grassland study area showed no change over time. Thus, long-term change detection techniques showed the increase in vegetation cover was related to carbon balance for these two sites.