Decay resistance of extractive-free belian (eusideroxylon zwageri) and malagangai (potoxylon melagangai)
Belian (Eusideroxylon z.wagen) and malagangai (Potoxylon melagangai) are among the heaviest and very durable timbers ofMalaysia and Indonesia. It is well known that the natural durability of timbers is influenced by their extractives content. This study was earned out to determine the decay resistan...
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| Format: | Proceeding |
| Language: | English |
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Forestry & Forest Products Research
2004
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/912/ http://ir.unimas.my/id/eprint/912/1/DECAY%20RESISTANCE.pdf |
| _version_ | 1848834646465314816 |
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| author | Jusoh, Ismail Isa, Ipor |
| author_facet | Jusoh, Ismail Isa, Ipor |
| author_sort | Jusoh, Ismail |
| building | UNIMAS Institutional Repository |
| collection | Online Access |
| description | Belian (Eusideroxylon z.wagen) and malagangai (Potoxylon melagangai) are among the heaviest and very durable timbers ofMalaysia and Indonesia. It is well known that the natural durability of timbers is influenced by their extractives content. This study was earned out to determine the decay resistance of extractive-free E. z.wageri and P. melagangai wood. Heartwood and sapwood ofE. z.wageri and P. melagangai were cut into test blocks of 2 em x 2 em cross-section and 5 mm thickness. Extractives were extracted using Soxhlet apparatus. The four wood decay fungi used in this study were three white-rot fungi, Lentinus sajor-caju, Trametes versicolor and Pycnoporus sanguineus and one brown-rot fungus, Gloeophyllum trabeum. Wood decay was assessed based
on weight loss after 12 weeks exposure in the soil block test. Test blocks exposed to P. sanguineus resulted in higher weight loss than those exposed to C. trabeum.
Sapwood and heartwood of E. z.wageri showed higher decay resistance compared with P. melagangai. Extractive-free blocks had higher weight losses than the unextracted blocks. Although extraction of extractives significantly reduced decay resistance of both wood species, the extractive-free blocks could still be considered resistant. This study showed that the high resistance ofE. z.wageri and P. melagangai to decay is due to the presence of toxic extractives. However, extractives are not the sole factor
contributing to decay resistance of both wood species. |
| first_indexed | 2025-11-15T05:55:17Z |
| format | Proceeding |
| id | unimas-912 |
| institution | Universiti Malaysia Sarawak |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T05:55:17Z |
| publishDate | 2004 |
| publisher | Forestry & Forest Products Research |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | unimas-9122022-01-12T06:57:18Z http://ir.unimas.my/id/eprint/912/ Decay resistance of extractive-free belian (eusideroxylon zwageri) and malagangai (potoxylon melagangai) Jusoh, Ismail Isa, Ipor AC Collections. Series. Collected works Belian (Eusideroxylon z.wagen) and malagangai (Potoxylon melagangai) are among the heaviest and very durable timbers ofMalaysia and Indonesia. It is well known that the natural durability of timbers is influenced by their extractives content. This study was earned out to determine the decay resistance of extractive-free E. z.wageri and P. melagangai wood. Heartwood and sapwood ofE. z.wageri and P. melagangai were cut into test blocks of 2 em x 2 em cross-section and 5 mm thickness. Extractives were extracted using Soxhlet apparatus. The four wood decay fungi used in this study were three white-rot fungi, Lentinus sajor-caju, Trametes versicolor and Pycnoporus sanguineus and one brown-rot fungus, Gloeophyllum trabeum. Wood decay was assessed based on weight loss after 12 weeks exposure in the soil block test. Test blocks exposed to P. sanguineus resulted in higher weight loss than those exposed to C. trabeum. Sapwood and heartwood of E. z.wageri showed higher decay resistance compared with P. melagangai. Extractive-free blocks had higher weight losses than the unextracted blocks. Although extraction of extractives significantly reduced decay resistance of both wood species, the extractive-free blocks could still be considered resistant. This study showed that the high resistance ofE. z.wageri and P. melagangai to decay is due to the presence of toxic extractives. However, extractives are not the sole factor contributing to decay resistance of both wood species. Forestry & Forest Products Research 2004 Proceeding NonPeerReviewed text en http://ir.unimas.my/id/eprint/912/1/DECAY%20RESISTANCE.pdf Jusoh, Ismail and Isa, Ipor (2004) Decay resistance of extractive-free belian (eusideroxylon zwageri) and malagangai (potoxylon melagangai). In: Conference on Forestry & Forest Products Research : 308-315 (2004). (Unpublished) |
| spellingShingle | AC Collections. Series. Collected works Jusoh, Ismail Isa, Ipor Decay resistance of extractive-free belian (eusideroxylon zwageri) and malagangai (potoxylon melagangai) |
| title | Decay resistance of extractive-free belian (eusideroxylon zwageri) and malagangai (potoxylon melagangai) |
| title_full | Decay resistance of extractive-free belian (eusideroxylon zwageri) and malagangai (potoxylon melagangai) |
| title_fullStr | Decay resistance of extractive-free belian (eusideroxylon zwageri) and malagangai (potoxylon melagangai) |
| title_full_unstemmed | Decay resistance of extractive-free belian (eusideroxylon zwageri) and malagangai (potoxylon melagangai) |
| title_short | Decay resistance of extractive-free belian (eusideroxylon zwageri) and malagangai (potoxylon melagangai) |
| title_sort | decay resistance of extractive-free belian (eusideroxylon zwageri) and malagangai (potoxylon melagangai) |
| topic | AC Collections. Series. Collected works |
| url | http://ir.unimas.my/id/eprint/912/ http://ir.unimas.my/id/eprint/912/1/DECAY%20RESISTANCE.pdf |