Pokok Belian

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Pokok Belian
Status pemuliharaan
Pengelasan saintifik
Alam: Tumbuhan
Divisi: Magnoliophyta
(tiada peringkat): Magnoliid
Order: Laurales
Keluarga: Lauraceae
Genus: Eusideroxylon
Spesies: E. zwageri
Nama binomial
Eusideroxylon zwageri
Teysm. & Binnend.

Pokok Belian merupakan sejenis pokok kayu keras, nama saintifiknya Eusideroxylon zwaggen.[1] Ia merupakan pokok yang lambat tumbuh membesar dan bukan dipterokarpa.

Kayu Belian (Eusideroxylon zwageri), spesies balak Malaysia Timur, tahan secara semulajadi disebabkan ciri-ciri anatomi uniknya dan kandungan hasilan yang tinggi. Kayunya mampu tahan dedahan kepada tanah dan keadaan lain tanpa kehilangan kekuatan yang jelas. Beberapa tiang eletrik Belian yang diuji di Sarawak menunjukkan hanya reput permukaan pada garis tanah selepas 20 tahun. Ujian menggunakan mikroskop elektron ("Transmission electron microscopy (TEM)") menunjukkan kehadiran rongga reput lembut pada dinding fiber. In addition to soft rot attack of secondary walls, in severely decayed tissues, other areas of fibre walls, including the highly lignified middle lamellae, were also degraded. Bacteria were also abundant in these cells, suggesting that disintegration of wood tissues at the surface could result from a combined action of soft rot fungi and wood degrading bacteria.[2]

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