Threat of potential bioinvasion in a natural forest in Poitan, Banaue, Ifugao, Cordillera administrative region

Issue Date

12-2013

Abstract

Enumeration of a natural forest (muyong) coupled to rice terraces (payoh) in Poitan, Banaue, Ifugao resulted in the recognition of three types of vegetation after raw data from 22 plots composed of importance values of tree species were analyzed and subjected to Polar Ordination Analysis and Principal Component Analysis. The three clusters were named according to their most dominant species, namely Pinus kesiya cluster, Vaccinium whitfordii cluster and Clethra tomentella-Swietenia macrophylla cluster. Shannon-Wiener Diversity Indices (H) of 22 plots were determined and results show that Pinus plots had lower H values compared with both Vaccinium and Clethra-Swietenia H values. This is attributed to the greater shade in Pinus plots as the pine trees there are large with bigger crowns. In the two other clusters, more light reaches the forest floor allowing a diverse recruitment of light demanding tree taxa. Two of the three alien tree taxa, Large Leaf Mahogany Swietenia macrophylla and Yemane Gmelina arborea. are definitely introduced. However, the presence of a third alien tree species, Japanese Alder Alnus japonica, in the muyong is uncertain if it was also purposely introduced in the forest study area. Visually, this light-demanding wind-dispersed temperate Asian taxon is randomly numerous in open areas, thickets and secondary forests of the Cordillera highlands. The present study and survey will also be replicated in Barangays Amganad and Kinakin, Banaue, Ifugao.

Source or Periodical Title

Philippine Journal of Science

ISSN

0031-7683

Volume

142

Issue

2

Page

101-113

Document Type

Article

Physical Description

illustrations, tables

Language

English

Subject

Bio-invasion, Importance value, Muyong, Payoh, Polar Ordination Analysis, Principal Component Analysis, Shannon-Wiener Diversity index

Digital Copy

yes

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