Spatial-temporal dynamics of land surface phenology over Africa for the period of 1982-2015.

Heliyon · 2023 · PMC10360589 · PMID 37484377

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a negative trendno p-value reported

However, from the interannual variations of NDVI, this study didn't observe the similar changes to the mean decadal variations of NDVI in southern Africa (a positive change in mean decadal NDVI before 2000s, while a negative trend after 2000s).

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a positive trendno p-value reported

The mean decadal NDVI presented a positive trend before the 2000s while a negative trend after the 2000s in southern Africa.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.