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SOME ANATOMICAL FEATURES OF AN ACACIA HYBRID, A. MANGIUM AND A. AURICULIFORMIS GROWN IN INDONESIA WITH REGARD TO PULP YIELD AND PAPER STRENGTH

R Yahya, J Sugiyama, D Silsia and J Gril
Journal of Tropical Forest Science
Vol. 22, No. 3 (July 2010), pp. 343-351
Stable URL: http://www.jstor.org/stable/23616663
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
SOME ANATOMICAL FEATURES OF AN ACACIA HYBRID, A. MANGIUM AND A. AURICULIFORMIS GROWN IN INDONESIA WITH REGARD TO PULP YIELD AND PAPER STRENGTH
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Abstract

The objectives of this study were to compare anatomical wood properties, chemical composition and wood density between an Acacia hybrid and its parents, namely, Acacia mangium and Acacia auriculiformis. The strength of the relationship between these anatomical properties or wood density and chemical composition as a way to predict the pulp yield and paper strength was studied. Three seven-year-old trees per species were randomly selected from an experimental plantation. Compared with both parents, the Acacia hybrid had longer fibre, and higher slenderness ratio, fibre proportion and holocellulose content but smaller proportions of vessels, parenchyma cells and extractives. In addition, the hybrid tended to have thinner cell wall, and lower proportion of ray cells, rigidity and lignin content but higher flexibility coefficient and wood density than A. mangium. Holocellulose, α-cellulose and lignin contents were all reliably predicted by fibre length. Slenderness ratio was a better predictor of extractives content than fibre length. Both fibre length and slenderness ratio were better predictors of chemical composition than wood density. Therefore, fibre length and slenderness ratio could be good predictors of pulp yield and paper strength for acacias. Kajian ini bertujuan untuk membandingkan ciri-ciri anatomi kayu, komposisi kimia dan ketumpatan kayu Acacia hibrid dengan induknya iaitu Acacia mangium dan Acacia auriculiformis. Kekuatan perhubungan antara ciri anatomi atau ketumpatan kayu dengan komposisi kimia dikaji sebagai cara untuk menjangka hasil pulpa dan kekuatan kertas. Tiga pokok berusia tujuh tahun daripada setiap spesies dipilih secara rawak daripada ladang eksperimen. Acacia hibrid mempunyai gentian yang lebih panjang serta nisbah kelangsingan, peratusan gentian dan kandungan holoselulosa yang lebih tinggi daripada kedua-dua induk. Namun, peratusan vesel, sel parenkima dan hasil ekstraktifnya adalah lebih rendah. Di samping itu, Acacia hibrid mempunyai dinding sel yang lebih nipis, peratusan sel ruji, ketegaran dan kandungan lignin yang lebih rendah daripada A. mangium. Namun, A. hibrid mempunyai koefisien kelenturan dan ketumpatan kayu yang lebih tinggi daripada A. mangium. Kandungan-kandungan holoselulosa, α-selulosa dan lignin dapat dijangka berasaskan panjang gentian. Nisbah kelangsingan lebih baik daripada panjang gentian dalam menjangka kandungan ekstraktif kayu. Kedua-dua panjang gentian dan nisbah kelangsingan lebih baik daripada ketumpatan kayu dalam menjangka komposisi kimia kayu. Oleh itu panjang gentian dan nisbah kelangsingan boleh digunakan untuk menjangka penghasilan pulpa daripada acasia dan kekuatan kertas yang dibuat daripada pulpanya.

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