Evolution of the holocene palaeoenvironment in Rwanda. Climatic implications deduced from the palynological analysis of sedimentary sequences | Evolution du paleoenvironnement holocene au Rwanda. Implications climatiques deduites de l'analyse palynologique de sequences sedimentaires
1998
Roche, E. (Musee royal de l'Afrique centrale, Tervuren (Belgium))
Palynological analysis of three sedimentary sequences coming from mountainous peatbogs of Rwanda reveals that some important climatic events occurred during the Holocene period. From ca. 12,000 until ca. 7000 years B.P. (before the present) a cold and dry climate became gradually warmer and wetter. The optimum of humidity, having reached ca. 6000 year B.P., favoured a large extension of forests at that time. After a new aridity peak (ca. 4000-3000 B.P.), climate had evolved to its present situation, warmer and wetter. However, during the last two millenia, two dry phases occurred again : the first one, ca. 500 A.D. (after date); the second one around 16th-17th centuries.
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