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Canopy and soil modification of precipitation chemistry in a clonal Eucalypt stand in Congo. Comparison with an adjacent savanna ecosystem

Laclau J.P., Bouillet J.P., Ranger J.. 2000. In : Forests and society : the role of research. Vienne : IUFRO, p. 706-718. IUFRO World Congress. 21, 2000-08-07/2000-08-12, Kuala Lumpur (Malaisie).

The dynamics of nutrients are compared in a clonal eucalypt plantation and in a native savanna in Congo. This paper focuses on the changes of the precipitation chemistry during the transfer of solutions in both ecosystems. During the rainy and the dry seasons rainfall was on average respectively 151 mm and 7 mm per month. Chemical analyses performed during 17 months show that the concentration of all the elements in rainfall increases sharply during the dry season. Precipitation solutions are acid with a dominance of C²+ and CI' Throughfall and stemflow are enriched for most of the elements but a N foliar uptake was bserved in both stands.

Mots-clés : eucalyptus; structure du sol; précipitation chimique; nutrition des plantes; congo

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