Floristic composition and structure of Philippine took forest in the Satoyama-Satami landscape of Batangas Province, Verde Island Passage, Philippines
2018
Caringal, A.M. | Buot, I.E.Jr.
Ongoing resort establishment along the coast of Verde Island Passage Marine Corridor in Batangas Province [Philippines] threatens the natural population of Tectona philippinensis - an endemic species. Specifically, the study aimed to determine the general floristic composition and structural attributes of woody vegetation associated with T. philippinensis and evaluate the zonation patterns and environmental factors affecting the distribution of species in the Philippine teak forest landscape. Vegetation data were collected between October 2016 - February 2017 from 24: 20m x 20m (=0.96ha) quadrats randomly established along the 56km island-mainland agro-ecosystem continuum. Vegetation parameters such as abundance, diameter and height of woody species were recorded for the manual estimates of basal area, relative frequency, relative dominance, and importance value. Shannon-Wiener (H') and Evenness (J) values for all species were generated by PAleontological STatistics (PAST) Software Package Version 3.15. The floristic survey enumerated a total of 128 species under 111 genera in 48 families. The average H' was 1.95 which ranged from 0.8675 to 2.681 per 400 sqm while the mean Peilou's J or Evenness was 0.3149 varying from 0.0985 to 0.5631/400sqm. The H' Index in the present study was within the Very Low range (1.99) to Moderate (2.5-2.99). In terms of structure, large number of trees belongs to the lower dbh and height classes which indicate regeneration under considerable disturbances. Despite abundance of human-disturbance indicator flora, T.philippinensis was the most frequent (100%) and most important dominant (IV: 65.3%) along this satoyama-satouimi landscape where co-dominance are also shared by coastal floral such as Xylocarpus, Thespesia, and Terminalia. Generally, the floristic elements and vegetation structure of Philippine teak forest still indicated a healthy reproductive forest associated with an 'open-area phenomena' if not outright anthropogenic disturbances.
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