Kajian ke atas Biojisim dan kualiti kayu bagi tiga spesies cepat tumbuh hutan sekunder: Dyera polyphylla (Miq.) Ashton (Jelutong Paya), Duabanga moluccana Bi. (sawih) dan Endospermum diadenum (Miq.) airy shaw (Terbulan)

Siti Nurasmah, Abu Samat (2013) Kajian ke atas Biojisim dan kualiti kayu bagi tiga spesies cepat tumbuh hutan sekunder: Dyera polyphylla (Miq.) Ashton (Jelutong Paya), Duabanga moluccana Bi. (sawih) dan Endospermum diadenum (Miq.) airy shaw (Terbulan). Masters thesis, Universiti Malaysia Sarawak, (UNIMAS).

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Abstract

Study on biomass allocation and wood quality for three fast growing species viz. Dyera polyphylla (Miq.) Ashton (Jelutong Paya), Duabanga moluccana Bf. (Sawih) and Endospermum diadenum (Miq.) Airy Shaw (Terbulan) was conducted. There is lack information in variation of anatomy, physical and mechanical properties of the species. The biomass of stem section contributed the highest among the three species. There were linear relationships oftotal biomass of whole trees and stem biomass against diameter breast height (DBH (em)) in each specie However, negative relationships were obtained for tree height and biomass of branch section against DBH Sawih had shortest fibrous xylem, lowest diameter offibrous xylem, lumen and thinnest xylem as compare to those from Jelutong paya and Terbulan. Terbulan had the longest fiber whilst Jelutong paya had highest diameter of both fiber and lumen with thickest fiber as compare to those from Sawih and Terbulan. Terbulan has highest specific gravity (SG) compare with the other two species. Moisture content (MC) was highest from Sawih. Modulus ofelasticity (MOE) and modulus ofrupture (MOR)from Terbulan were highest with the value of55.85 MPa and 6294 MPa respectively. Variations ofanatomical characteristics from the three species did not reveal obvious difference although significant differences occurred both radial and vertical forms. Both SG and MC did not reveal obvious trend according to its height for Jelutong paya. For Sawih, SG was highest at the height of 70% and in vice versa for Terbulan. MOE and MOR were 'not significantly differed according to tree height. Correlation of anatomical, mechanical and physical characteristics of Jelutong paya demonstrated positive significance between diameter of fiber and lumen, between ray height and MC However, significant negative correlation was obtained for total number ofvessellmm2 and SG. Sawih had diameter offiber had negatively correlated whilst at significant level for number ofvessellmm2, MaR, MOE and SG. Diameter ofboth fiber and lumen ofTerbulan achieved high correlation with r= 0.957.

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