Evaluation de la dynamique forestière et sa variabilité dans les forêts denses humides semi-décidues du Bassin du Congo

Abstract : Studying composition and dynamics of forest stand is an essential step in order to practice sustainable management for tropical moist forest. This study aims to understand the effects of different logging intensities on forest stands located in particular geographic areas in the Congo Basin. The following questions are addressed: (1) Does floristic composition of forest stands vary according to climate and geographic conditions? (2) Does logging triggers growth of all tree species, when logging intensity is sufficient? (3) Does logging enable to reduce mortality of helophilious species while increasing their recruitment, as well as increasing the mortality rate of shade tolerant species? (4) Does diversity increase after logging? The data come from the IFO-DANZER permanent device located in north Republic of Congo. Four different areas were analysed, including two areas which undertook logging activities. Every area contains between 28 and 502 tree.ha-1 with a logging activity of 1 to 9 tree.ha-1 (0,7 à 9,1 m2.ha-1). Forest stands located on (grès horizontaux) and (schistes quartzitiques) are less dense and diverse than those located on (formation schisto-calicaro-gréseuse ou alluvionnaire). Logging does not have an impact on species? diversity but increases the presence of heliophilious species. The effect of logging on growth speed is more important when the logging intensity is stronger. This effect is even more visible when the area is dense. Logged parcels tend to have a lower mortality rate and a higher recruitment rate than non-logged parcels.
Document type :
Master thesis
File URL :
http://docnum.univ-lorraine.fr/prive/BUS_M_2013_BERNARD_AMELIE.pdf
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https://hal.univ-lorraine.fr/hal-01778794
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Submitted on : Thursday, April 26, 2018 - 9:29:10 AM
Last modification on : Friday, April 27, 2018 - 1:13:55 AM

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Amélie Bernard. Evaluation de la dynamique forestière et sa variabilité dans les forêts denses humides semi-décidues du Bassin du Congo. Sciences de l'environnement. 2013. ⟨hal-01778794⟩

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