WOOD RESEARCH Volume 71, Number 3, 2026
Fanny Hidayati, Sugeng Pudjiono, Ratna Adji Hartati, Erlangga Abdillah, Harry Praptoyo, Ananto Triyogo, Gefri Indra Hutabarat, Alfia Dewi Fadwati, Agung Prasetyo, and GANIS LUKMANDARU

Variation of Growth Characteristics and Stress-Wave Velocity of the First Generation Manglietia glauca Families Planted in Indonesia

Growth characteristics, including stem diameter (D), tree height (H), and stem volume (V), and wood property stress-wave velocity (SWV), were measured in 100 families of 7-year-old first-generation Manglietia glauca trees planted in Indonesia. Therefore, this study aimed to evaluate the variation in D, H, V, and SWV among the families and their heritability. An analysis of the correlations, principal components and selection index was also conducted. The presence of significant differences in all measured traits among the families indicate a genetic contribution to traits variation. Low to moderate narrow-sense heritability values were observed across all traits, showing that the genetic enhancement of growth and wood properties in M. glauca is achievable through selective breeding. Moderate to highly significant positive correlations were observed among the growth traits, highlighting their strong interrelationships. D and SWV showed a low significant positive correlation. H and V showed no significant correlation with SWV. Therefore, SWV should be included as selection criterion in M. glauca breeding. PCA and selection index are effectively for identified superior families of growth and strength traits, supporting their selection as candidates for future breeding programs.

WOOD RESEARCH Volume 71, Number 1, 2026
JATINING DIRI ABIMANYU and GANIS LUKMANDARU

The Effect of Heartwood Extraction on Kraft Pulp Properties of Acacia mangium and Acacia aulacocarpa Wood

Since heartwood parts generally contain higher levels of extractive, in this study, several extraction methods were carried out as a pre-treatment of Acacia mangium and Acacia aulacocarpa heartwood sawdust, followed by kraft pulping in a micro digester. After extraction, pulp properties from the two species were significantly different. Polar solvent extraction effectively increased pulp yield and decreased kappa number levels, while the successive extraction had less impact. Pulp kappa number significantly increased after n-hexane extraction. Compared to the control samples, pulp brightness of A. aulacocarpa wood for single solvent and successive extraction increased sharply. The overall pulp hexuronic acid content significantly decreased after extraction. Successive extraction led to significantly lower pulp viscosity compared to a single solvent extraction. In general, heartwood extraction significantly increased the pH values of A. aulacocarpa black liquor. Considering pulp properties, this study recommends hot-water extraction for A. mangium and successive extraction (n-hexane and methanol) for A. aulacocarpa

WOOD RESEARCH Volume 71, Number 1, 2026
RIZKI ARISANDI, AISHAH AGUSTIAN, DWI LARASWATI, IKHNU PAWESTRI WARDANI, MASAGUS MUHAMMAD PRIMA PUTRA, GANIS LUKMANDARU, Andrian Fernandes, AULIA NUR LAKSMITA, DEBY MIPA SALAM, and RIZKI MAHARANI

The Extractive Analysis of Resins from Dipterocarpus verrucosus Fowx. E and Araucaria cunninghamii Aiton ex D. Don

The extractive analysis of D. verrucosus and A. cunninghamii identified key chemical markers in their resins. GC-MS analysis showed that sesquiterpenes, such as β-spathulenol and β-elemene were dominant in the neutral fractions of the two species. Furthermore, diterpenes, especially thunbergol, were found to be dominant in D. verrucosus while absent in A. cunninghamii. In addition, the acidic fractions were primarily composed of fatty and resin acids, mainly palmitic acid (D. verrucosus) and sandaracopimaric acid (A. cunninghamii). The study concludes that the specific combination of sesquiterpenes, fatty acids, and resin acids serves as a chemical fingerprint for the two species.