Articles | Volume 12, issue 14
Research article
29 Jul 2015
Research article |  | 29 Jul 2015

Does EO NDVI seasonal metrics capture variations in species composition and biomass due to grazing in semi-arid grassland savannas?

J. L. Olsen, S. Miehe, P. Ceccato, and R. Fensholt

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Revised manuscript accepted for BG
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Cited articles

Anyamba, A. and Tucker, C. J.: Analysis of Sahelian vegetation dynamics using NOAA-AVHRR NDVI data from 1981–2003, J. Arid Environ., 63, 596–614, 2005.
Anyamba, A., Tucker, C. J., Huete, A. R., and Boken, K.: Monitoring Drought Using Coarse-Resolution Polar-Orbiting Satellite Data, in: Monitoring and Predicting Agricultural Drought: A Global Study, edited by: Boken, K., Cracknell, A., and Heathcote, R. L., New York, Oxford Univerisity Press, Oxford University Press, part 5, 7–78, 2005.
Asner, G., Elmore, A. J., Olander, L., Martin, R. E., and Harris, A. T.: Grazing systems, ecosystem responses, and global change, Ann. Rev. Environ. Resour., 29, 261–299, 2004.
Begue, A., Vintrou, E., Ruelland, D., Claden, M., and Dessay, N.: Can a 25-year trend in Soudano-Sahelian vegetation dynamics be interpreted in terms of land use change?, A remote sensing approach, Glob. Environ. Change-Human Pol. Dimen., 21, 413–420, 2011.
Breman, H. and Cisse, A. M.: Dynamics of Sahelian Pastures in Relation to Drought and Grazing, Oecologia, 28, 301–315, 1977.
Short summary
Limitations of satellite-based normalized difference vegetation index (NDVI) for monitoring vegetation trends are investigated using observations from the Widou Thiengoly test site in northern Senegal. NDVI do not reflect the large differences found in biomass production and species composition between grazed and ungrazed plots. This is problematic for vegetation trend analysis in the context of drastically increasing numbers of Sahelian livestock in recent decades.
Final-revised paper