Exotic Gmelina arborea Roxb. plantation supports better understory plant diversity than native Nauclea orientalis (L.) plantation 30 years after their establishment in a watershed area in Southern Philippines Journal title: Journal of Biodiversity and Environmental Sciences (JBES) Authors: Jupiter V. Casas, Adrian M. Tulod, Lowell G. Aribal, Jose Hermis P. Patricio Subject(s): Biological Sciences, Environmental Sciences, Biology