Environmnetal constraints to natural regeneration of Alibangbang (Bauhinia malabarica Roxb.) in Carranglan Watershed, Nueva Ecija, Philippines .

Date

2011

Abstract

The study determined the causes of natural regeneration failure of Alibangbang in Carranglan Watershed in Nueva Ecija, Philippines. It also studied the biotic and anthropogenic factors that affect the low regeneration of the species, and assessed the activities of local residents in the watershed that influence low regeneration. Field experiment on insect infestation and roden predation, nursery experiment on seed viability, interview schedule, and analysis of secondary data were done. The larva of Caryedon serratus (Olivier) infested the pods and seeds of Alibangbang. The mean infestation rate on pods and seeds in the exposed branches was 78.32% and 73.23%, respectively. Other branches of similar experimental trees recorded a mean infestation rate of 75.00% on pods and 71.19% on seeds. Examinations conducted in different parts of the watershed obtained a mean infestation rate of 65.00% and 67.80% on pods and seeds, respectively. On the other hand, ripened seeds and wildlings of Alibangbang were not preferred food of rodent since no predation was recorded in the experimental site. Only 47.50% germination was obtained in seed soaked in tap water for 24 hours. This treatment had the earliest germination period (7.75 days), longest total germination period (52 days) and highest germination value (3.32). Similarly, it recorded the highest root length (5.73cm), total length (12.34 cm) and seedling vigor index (585.62). Meanwhile, seeds alternately soaked in tap water and hot water for 30 seconds ha dthe highest germination energy (40.75%). Gathering of forest resources (i.e. Alibangbang shoot and leaves, fuel wood, charcoal, bamboo poles and cogon grass), upland farming, grazing and frequent grassfire affect the low regeneration of Alibangbang in the watershed. This information is vital in planning rehabilitation programs for denuded areas using Alibangbang.

Document Type

Master Thesis

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 2011 E8 G84

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