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Interannual persistence effects in vegetation dynamics of semi-arid Africa

Abstract : Over 15 years of Normalized Difference Vegetation Index (NDVI) data from the Advanced Very High Resolution Radiometers (AVHRR) are used to study the response of vegetation activity to rainfall in three semi-arid regions of Africa. The relationships between annual NDVI and annual precipitation (PPT) time series are examined using statistical approaches (simple and partial correlations, linear multiple regressions). It appears that annual NDVI highly depends on PPT of the concurrent year and the previous year. An analysis of particularly dry and wet years enables to better diagnose two distinct responses of vegetation activity to rainfall. The “recovery” effect represents the difficulty of vegetation to recover from previous two-year drought conditions. The “memory” effect represents the capacity of semi-arid ecosystems to benefit from a water surplus at a one-year time-lag.
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https://hal.archives-ouvertes.fr/hal-00070908
Contributor : Viviane Djoufack Connect in order to contact the contributor
Submitted on : Monday, May 22, 2006 - 12:33:33 PM
Last modification on : Friday, June 8, 2018 - 2:50:10 PM

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Nadège Martiny, yves Richard, Pierre Camberlin. Interannual persistence effects in vegetation dynamics of semi-arid Africa. Geophysical Research Letters, American Geophysical Union, 2005, 32, pp.L24403. ⟨10.1029/2995GL024634⟩. ⟨hal-00070908⟩

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