The Effect of Heat Treatment on The Durability of Bamboo Gigantochloa scortechinii

ABSTRACT. The efficiency of early selection was evaluated based on age trend in genetic parameters using tree height data that was measured periodically up to 3 years of age in four seedling seed orchards of Acacia mangium at South Kalimantan, Indonesia. The four orchards were grouped into two populations based upon their provenances, namely: Papua New Guinea (PNG) and Far North Queensland-Australia (FNQ). A model for time trend of genetic parameters was developed by fitting regression equation to the estimates of variances and correlations using tree height data as an independent variable. In both populations, genetic variances and total phenotypic variances increased along with the mean height. Trend of individual heritability along the rotation ages were almost stable at around 0.19 for PNG, and gradually increased from 0.36 to 0.40 for FNQ. Trend of genetic correlations between selection age and rotation age increased rapidly starting at around 0.5 for PNG and 0.6 for FNQ, then exceeding 0.9 at age four years in both populations. Genetic gains due to indirect selection increased with age, in which the gains in FNQ were generally larger than those in PNG. Selection efficiency based on gain per year as a ratio of the gains from indirect selection to direct selection may conclude the optimum age for selection at age two years old in both of PNG and FNQ population.

Keywords: Acacia mangium, age-age genetic correlation, genetic parameter, heritability, seedling seed orchards, selection efficiency

ABSTRACT. Bamboo signifies as one of the fastest growing plants and it can be used for various products. In tropical countries such as Indonesia and Malaysia, bamboo is abundantly available at reasonable prices, therefore it is used for numerous purposes. However, as lignocellulosic material, bamboo is susceptible to fungal and insect attacks. Heat treatment is an option to improve bamboo's durability. The objective of this study was to improve the durability of bamboo using hot oil palm treatment. A Malaysian grown bamboo species, Buluh Semantan (Gigantochloa scortechinii), as a study material was soaked in hot oil palm for various temperatures and soaking time, before being inoculated with the basidiomycete Coriolus versicolor in an agar block test. The results demonstrated that the longer the heating time, the more improved the durability of bamboo. Altering the temperature in the palm oil treatment produced varying results. Bamboo blocks that heated in hot oil palm at 100°C for 60 minutes shows considerably less weight reduction that indicates less fungal attack. Overall, the higher the temperature, the better the durability of bamboo. Please indicates what the meaning of heat treatment in this experiment, it is not clear.

Keywords: Durability, heat treatment, bamboo, Gigantochloa scortechinii, Coriolus versicolor

Ketersediaan

Tidak ada salinan data

Informasi Detil

Judul Seri

Journal of Forestry Research

No. Panggil

//

Penerbit

: ., 2012

Deskripsi Fisik

25-29

Bahasa

English

ISBN/ISSN

0216-0919

Klasifikasi

//

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subyek

-

Info Detil Spesifik

-

Pernyataan Tanggungjawab

-

Versi lain/terkait

Lampiran Berkas