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 × 500 m) 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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Forest Research Institute Malaysia
1997
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| Online Access: | http://psasir.upm.edu.my/id/eprint/51020/ http://psasir.upm.edu.my/id/eprint/51020/1/51020.pdf |
| _version_ | 1848851719842168832 |
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| author | Wan Mohd, Wan Razali Wan Ahmad, Wan Mohd Shukri Muktar, Ashari |
| author_facet | Wan Mohd, Wan Razali Wan Ahmad, Wan Mohd Shukri Muktar, Ashari |
| author_sort | Wan Mohd, Wan Razali |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | This study was carried out on a randomly chosen 10-ha (200 × 500 m) 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 sizes used. The minimum sampling intensity associated with each quadrat size, at 90% confidence and 10% error, was determined in estimating tree volume. In general, the 30 × 30 m quadrat was found to be statistically the most efficient in sampling tree volume ≥ 15 cm dbh at 90% confidence and 10% 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% sampling intensity is required to inventory all trees ≥ 15 cm dbh with 90% confidence and 10% error levels using 30 × 30 m quadrat, increasing to 24% when using 20 × 50 m quadrat. |
| first_indexed | 2025-11-15T10:26:40Z |
| format | Article |
| id | upm-51020 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T10:26:40Z |
| publishDate | 1997 |
| publisher | Forest Research Institute Malaysia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-510202017-05-02T04:35:52Z http://psasir.upm.edu.my/id/eprint/51020/ Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia Wan Mohd, Wan Razali Wan Ahmad, Wan Mohd Shukri Muktar, Ashari This study was carried out on a randomly chosen 10-ha (200 × 500 m) 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 sizes used. The minimum sampling intensity associated with each quadrat size, at 90% confidence and 10% error, was determined in estimating tree volume. In general, the 30 × 30 m quadrat was found to be statistically the most efficient in sampling tree volume ≥ 15 cm dbh at 90% confidence and 10% 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% sampling intensity is required to inventory all trees ≥ 15 cm dbh with 90% confidence and 10% error levels using 30 × 30 m quadrat, increasing to 24% when using 20 × 50 m quadrat. Forest Research Institute Malaysia 1997 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/51020/1/51020.pdf Wan Mohd, Wan Razali and Wan Ahmad, Wan Mohd Shukri and Muktar, Ashari (1997) Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia. Journal of Tropical Forest Science, 10 (2). pp. 141-154. ISSN 0128-1283 https://www.frim.gov.my/en/publication/journal-of-tropical-forest-science-jtfs/ |
| spellingShingle | Wan Mohd, Wan Razali Wan Ahmad, Wan Mohd Shukri Muktar, Ashari Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia |
| title | Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia |
| title_full | Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia |
| title_fullStr | Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia |
| title_full_unstemmed | Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia |
| title_short | Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia |
| title_sort | natural forest dynamics. ii. sampling of tree volume using quadrats in tropical forests of peninsular malaysia |
| url | http://psasir.upm.edu.my/id/eprint/51020/ http://psasir.upm.edu.my/id/eprint/51020/ http://psasir.upm.edu.my/id/eprint/51020/1/51020.pdf |