Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia

Wan Razali Wan Mohd, . and Wan Mohd Shukri Wan Ahmad, . Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia. pp. 141-154. ISSN 0128-1283

Wan Razali W. M. Mohd. Shukri W. A. Ashari M. 1997. Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia. This study was carried out on a randomly chosen 10-ha (200 x 500m) forest area within the 50-ha area Demography Project of the Forest Research Institute Malaysia (FRIM) at Pasoh Forest Reserve Negri Sembilan Malaysia. A modified minimum-variance method was used to determine statistically the most efficient quadrat size among the eight quadrat sizez used. The minimum sampling intensity associated with each quadrat size at 90 percent confidence and 10 percent error was determined in estimating tree volume. In general the 30 x 30 m quadrat was found to be statistically the most efficient in sampling tree volume more than and equal to 15cm dbh at 90 percent confidence and 10 percent error levels. The percentage sample size requirement differed between species groups size classes and quadrat sizes used. The implications of the result of the present study are discussed in relation to the current inventory methods used in Malaysia. For example a 16 percent sampling intensity is required to inventory all trees more than and equal to 15 cm dbh with 90 percent confidence and 10 percent error levels using 30 x 30 m quadrat increasing to 24 percent when using 20 x 50 m quadrat.

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Abstract

Wan Razali W. M. Mohd. Shukri W. A. Ashari M. 1997. Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia. This study was carried out on a randomly chosen 10-ha (200 x 500m) forest area within the 50-ha area Demography Project of the Forest Research Institute Malaysia (FRIM) at Pasoh Forest Reserve Negri Sembilan Malaysia. A modified minimum-variance method was used to determine statistically the most efficient quadrat size among the eight quadrat sizez used. The minimum sampling intensity associated with each quadrat size at 90 percent confidence and 10 percent error was determined in estimating tree volume. In general the 30 x 30 m quadrat was found to be statistically the most efficient in sampling tree volume more than and equal to 15cm dbh at 90 percent confidence and 10 percent error levels. The percentage sample size requirement differed between species groups size classes and quadrat sizes used. The implications of the result of the present study are discussed in relation to the current inventory methods used in Malaysia. For example a 16 percent sampling intensity is required to inventory all trees more than and equal to 15 cm dbh with 90 percent confidence and 10 percent error levels using 30 x 30 m quadrat increasing to 24 percent when using 20 x 50 m quadrat.

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Item Type:	Article
Additional Information:	Summaries (En Ms)
AGROVOC Term:	FORESTS
AGROVOC Term:	FOREST TREES
AGROVOC Term:	VOLUME
AGROVOC Term:	SAMPLING
AGROVOC Term:	SURVEYS
AGROVOC Term:	TROPICAL FORESTS
AGROVOC Term:	DIPTEROCARPACEAE
AGROVOC Term:	PENINSULAR MALAYSIA BOSQUES
AGROVOC Term:	ARBOLES FORESTALES
AGROVOC Term:	VOLUMEN
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:52
URI:	http://webagris.upm.edu.my/id/eprint/17628

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