BIODIVERSITAS ISSN: 1412-033X Volume 19, Number 5, September 2018 E-ISSN: 2085-4722 Pages: 1891-1901 DOI: 10.13057/biodiv/d190541 The potential risk of tree regeneration failure in species-rich Taba Penanjung lowland rainforest, Bengkulu, Indonesia AGUS SUSATYA Department of Forestry, Faculty of Agriculture, Universitas Bengkulu. Jl. WR Supratman, Kota Bengkulu 38371A, Bengkulu, Indonesia. Tel./fax. +62- 736-21170, email:
[email protected] Manuscript received: 28 May 2018. Revision accepted: 22 September 2018. Abstract. Susatya A. 2018. The potential risk of tree regeneration failure in species-rich Taba Penanjung lowland rainforest, Bengkulu, Indonesia. Biodiversitas 19: 1891-1901. Tropical lowland rain forest is recognized by its high species richness with very few trees per species. It is also known for having tendency to outcrossing of its species with different floral sexualities, which requires the synchronization between flowering of its trees and the presence of pollinators. Such ecological attributes raise possible constraints for the forest trees to regenerate. The objective of the study was to assess the potential risk of failed regeneration for each tree species of the forest. Each of species with dbh of more than 5 cm in a one-ha plot was collected, identified, and its ecological criteria, including rarity, floral sexuality, seed size, and flowering phenology were determined. The potential risk of the failure of regeneration was calculated by summing all scores from Analytical Hierarchical Process of the criteria. The results indicated that the forest consisted of 118 species belonging to 69 genera and 37 families. Rare species accounted to 52.10% of the total species.