6533b857fe1ef96bd12b5020
RESEARCH PRODUCT
Interannual persistence effects in vegetation dynamics of semi-arid Africa
Nadège MartinyPierre CamberlinYves Richardsubject
HydrologyEnhanced vegetation indexAridNormalized Difference Vegetation Index[ SDE.MCG ] Environmental Sciences/Global ChangesGeophysicsClimatologyLinear regressionmedicineGeneral Earth and Planetary SciencesEnvironmental scienceEcosystemPrecipitationmedicine.symptom[ SDU.STU.CL ] Sciences of the Universe [physics]/Earth Sciences/Climatology[ SDV.OT ] Life Sciences [q-bio]/Other [q-bio.OT]Vegetation (pathology)Partial correlationdescription
[1] 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-01-01 |