Specification of gmelina (Gmelina arborea Roxb.) ideotypes based on farmer and land characteristics

Date

12-2016

Abstract

Gmelina (Gmelina arborea) is the most widely planted tree species in Nueva Vizcaya province in the Philippines. Its role in local wood supply becomes more important as a consequence of the ban on harvesting naturally growing timber. In fact, more than 90% of the wood supply in Region 2 in 2013 was gmelina. Wood is coming from different planting configurations such as solitary trees, home gardens, road sides, riparian strips, small stands, and large plantations. While gmelina appears to the most important tree in meeting local demand for wood, the yield per hectare is low due to poor tree management and mismatch between species and site. Survey results indicate great potentials for tree improvement with effort coming from the tree owners themselves and supported by scientific approach in tree improvement. As one of the initial steps, research on ideotype, or conceptual model of an ideal plant, promises to play a key role. The study worked on gmelina timber ideotype. Several ideotypes were drawn based from tree owner preferences, silvicultural practices, relationships between tree traits that define yield, and site factors. Between-tree- trait relationships appear to the most important category of factors that define an ideal tree form because of consistency across different sites. All ideotypes possess stems that convert well to lumber. Bends in the butt section and at point close to the crown are tolerated for as long as long branchless bole is present. The formation of upright branches that assume the behavior of the main bole contribute significantly to wood yield; hence, ideotypes that are practically suitable for wide-spacing planting scenario and for tree functions associated with disturbance on tree growth have been specified together with more ideal forms that are easily realized in well-managed stands. The study provides rich information vital to tree improvement process. The status that gmelina enjoys, that is being the primary source of wood for scores of uses, shall inspire efforts in revitalizing attention to the species so that sustained wood supply is achieved.

Document Type

Dissertation

Degree

Doctor of Philosophy in Forestry

College

Graduate School (GS)

Adviser/Committee Chair

Wilfredo M. Carandang

Committee Member

Rex Victor O. Cruz, Nathaniel C. Bantayan, Armando M. Palijon, Wilfredo M. Carandang

Language

English

LC Subject

Gmelina arborea, Gmelina arborea -- Planting, Gmelina arborea -- Variation, Forest productivity, Gmelina arborea -- Breeding, Forestry, Silviculture and Forest Influences Institute of Renewable Natural Resources

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 996 2016 F65 V35

This document is currently not available here.

Share

COinS