Journal
REMOTE SENSING OF ENVIRONMENT
Volume 115, Issue 4, Pages 1081-1089Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2010.12.013
Keywords
Africa; Gross primary production (GPP); Moderate Resolution Imaging; Spectroradiometer (MODIS); Enhanced vegetation index (EVI); Evaporative fraction (EF); Leaf area index (LAI)
Funding
- Swedish National Space Board [120/06, 74/08]
- Swedish Research Council [VR 621-2004]
- EU [037137]
- Wankama stations in Niger, French
Ask authors/readers for more resources
One of the most frequently applied methods for integrating controls on primary production through satellite data is the light use efficiency CLUE) approach, which links vegetation gross or net primary productivity (GPP or NPP) to remotely sensed estimates of absorbed photosynthetically active radiation (APAR). Eddy covariance towers provide continuous measurements of carbon flux, presenting an opportunity for evaluation of satellite estimates of GPP. Here we investigate relationships between eddy covariance estimated GPP, environmental variables derived from flux towers, Moderate Resolution Imaging Spectroradiometer (MODIS) enhanced vegetation index (EVI) and GPP across African savanna ecosystems. MODIS GPP was found to underestimate GPP at the majority of sites, particularly at sites in the Sahel. EVI was found to correlate well with estimated GPP on a site-by-site basis. Combining EVI with tower-measured PAR and evaporative fraction (EF, a measure of water sufficiency) improved the direct relationship between GPP and EVI at the majority of the sites. The slope of this relationship was strongly related to site peak leaf area index (LAI). These results are promising for the extension of GPP through the use of remote sensing data to a regional or even continental scale. (C) 2011 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available