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- W2013899765 abstract "Cet article présente les résultats palynologiques de deux sondages effectués dans la vallée de la Ndurumu (1367 m d'altitude) occupée par un grand marais à papyrus. Ils documentent l'histoire des végétations marécageuses depuis 6400 ans BP et mettent en évidence l'installation d'une forêt à Syzygium et Phoenix entre 2800 et 1600 ans BP. Sa disparition brutale vers 1230 ± 160 ans BP est synchrone de la mise en place de la papyraie. Les données polliniques traitées statistiquement par analyses multivariées traduisent les modifications de la végétation interprétées en terme de fluctuations de nappe, apparemment synchrones des variations climatiques régionales. La courbe de Ricinus communis pourrait témoigner de pratiques culturales vers 1230 ± 160 ans BP. This paper presents the results of the pollen analysis of two cores taken in a papyrus swamp of the Ndurumu Valley, north of Burundi (2°43′S, 29°58′E) at 1367 m of altitude. The zonation ofthe pollen record and the interpretation of pollen data are controlled by multivariate statistical studies such as the diversity index, factorial and cluster analysis. At the bottom of the core, dated around 6400 yr BP, the pollen assemblages document the installation of a pioneer forest including Macaranga and abundant ferns. Between 2800 and 1600 yr BP, the valley was occupied by a swamp forest dominated by Syzygium and Phoenix. The establishment of a papyrus swamp dates from 1250 yr BP when the forest disappeared. The abrupt disappearance of the forest is interpreted as the result of a rising water table rather than an effect of human deforestation, although a synchronous appearance of the cultivated Ricinus communis is registered at the same time." @default.
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- W2013899765 date "1992-12-01" @default.
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- W2013899765 title "Histoire et dynamique du marécage tropical de Ndurumu (Burundi), données polliniques" @default.
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- W2013899765 doi "https://doi.org/10.1016/0034-6667(92)90153-8" @default.
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