Reference : Impacts of past Human disturbances on present-day tree species assembly in a tropical...
Scientific congresses and symposiums : Poster
Life sciences : Environmental sciences & ecology
Life sciences : Multidisciplinary, general & others
http://hdl.handle.net/2268/158043
Impacts of past Human disturbances on present-day tree species assembly in a tropical forest of South-East Cameroon
English
Vleminckx, Jason [Université Libre de Bruxelles - ULB > EBE > > >]
Doucet, Jean-Louis [Université de Liège - ULiège > Forêts, Nature et Paysage > Laboratoire de Foresterie des régions trop. et subtropicales >]
Daïnou, Kasso mailto [Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels >]
Gillet, Jean-François mailto [Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels > >]
Morin-Rivat, Julie mailto [Université de Liège - ULiège > Forêts, Nature et Paysage > Laboratoire de Foresterie des régions trop. et subtropicales >]
Drouet, Thomas [Université Libre de Bruxelles - ULB > > > >]
Hardy, Olivier [Université Libre de Bruxelles - ULB > EBE > > >]
6-Nov-2013
A0
No
No
National
Symposium Paul Duvigneaud
du 5 au 6 novembre 2013
Université Libre de Bruxelles
Bruxelles
Belgique
[en] Ecology ; Central Africa ; Forest dynamics ; Anthropogenic disturbance ; Charcoal ; Tropical forests
[en] Many evidence have been found for intensive past Human presence in the forests of Central Africa, notably widespread charcoal occurrence in the soil. Forest clearing for slash-and-burn agriculture may have favored the competitiveness of light-demanding species (LD) to the detriment of shade-bearer species (SB). Hypothesis: Positive correlation between abundance of charcoal in the soil (proxy for past Human clearing) and abundance of LD.Mostly “young” charcoals were thought to reflect past Human disturbances that would have shaped present-day species assembly. However, CAI 0-20cm and CAI 20-100cm were highly correlated with each other (r-Pearson = 0.55; P<0.001) and both displayed positive correlations with Non-Pioneer LD abundance (significant with a classic test) and negative correlations with SB abundance. Although this observation is coherent with our hypothesis, significance disappeared when correcting for spatial autocorrelation [4], even after removing small-diameter trees potentially too young to be linked with last Human disturbances (not shown). Correlation of CAI between the two soil layers => Humans found appropriate conditions for settlement in the same area at different periods? Absence of significant correlation in ❸ (i) Last Human disturbances are too old to detect any signal on present-day tree species assembly. (ii) Human impact is weak compared to other factors (soil properties, dispersal limitation,…) (iii) Local scale heterogeneity of LD abundance is weak compared to landscape scale. Parallel large scale gradients in the abundance of Non-Pioneer LD and charcoal abundance (proxy for past slash-and-burn activities) were observed, but a causal link cannot be established so far.
FRIA - Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture
FRFC "Dynamique des populations d'arbres et d'herbacées héliophiles..."
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/158043

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