Tree Diversity and Stand Structure of Permanent Biodiversity Monitoring Area in Mount Makiling

Following the international protocol for establishment of permanent plots, a two-hectare permanent biodiversity monitoring area (PBMA) was established inside Makiling Forest Reserve. Results of the intensive 100% inventory revealed that the PBMA holds tremendous tree diversity. A total of 155 tree species were identified. Of these, 148 are indigenous to the Philippines with 47 endemics (30% endemism). The most abundant native species in the PBMA is Magabuyo (Celtis luzonica) with 2,287 individuals, followed by Balobo (Diplodiscus paniculatus), Tinaang pantai (Drypetes maquilingensis), and Apanang (Mallotus cumingii). The average diameter for all trees inside the plot is 14.28 cm. More than 90% of the individual trees fall under the category poles and saplings while large trees account to only 0.6%. Twenty-nine (29) species are listed under either the Philippine Red List (Fernando et al. 2008) or the IUCN Red List of Threatened Species (2015-4). Noteworthy among the list are the six critically endangered (CR) premium timber species including Makaasim (Syzygium nitidum), Kamagong (Diospyros discolor), Narra (Pterocarpus indicus), Bagtikan (Parashorea malaanonan), Guijo (Shorea guiso), and White lauan (Shorea contorta). The geodatabase that includes an interactive map developed in this study is of critical importance for future research activities in the area.

 

Keywords: Permanent biodiversity monitoring area, Makiling Forest Reserve, endemics, threatened species, geodatabase