Abstract
A floral survey was conducted in Aborlan Guba System, Aborlan, Palawanfollowing the quadrat technique of vegetation analysis by Mueller-Dombois &Ellenberg (1974) and Pacardo et al. (2000) to determine the forest zonationtherein and the environmental variables that influenced the vegetation pattern.Sixty-six quadrats, each for trees (10m x 10m) and saplings (2m x 2m) andseedlings and herbaceous vegetations (1m x 1m), were established throughout thestudy area. Four vegetation associations were distinguished from cluster analysis.Results of multivariate regression analysis reveal that elevation, air temperature,moisture content, water holding capacity, pH and potassium level of the soil, andhuman disturbance significantly influenced the spatial distribution of tree species.Human impact was inversely proportional to species richness (r2= 0.968). Sincethe area is encroached by the locals, the whole area must be categorized as a CoreZone for its immediate protection. Declaring it as a Protected Area under theNIPAS law ensures the long-term protection of the system.Keywords: Ecology, Forest, vegetation association, environmental factors, Palawan,Philippines
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