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Prasetyo, Agung,Endo, Ryota,Takashima, Yuya,Aiso, Haruna,Hidayati, Fanny,Tanabe, Jun,Ishiguri, Futoshi,Iizuka, Kazuya,Yokota, Shinso Institute of Forest Science 2015 Journal of Forest Science Vol.31 No.3
Zelkova serrata is an important hardwood species for the timber industry in Japan. Tree breeding programs for this species have mainly focused on growth characteristics such as stem diameter (D), tree height (TH), stem form, and branching. In order to fulfill timber industry needs, wood quality improvement should be included in the tree breeding program of this species. In the present study, growth characteristics, such as D and TH, and the stress-wave velocity (SWV), which is highly correlated with Young's modulus of wood, were measured for 20-year-old Z. serrata from eight half-sib families planted in a progeny test site with three different initial spacings. Significant differences in all the measured characteristics were found among the eight half-sib families. The variance components of the half-sib families for D, TH, and SWV were 27.2%, 47.3%, and 33.5%, respectively. These results indicate that all the measured characteristics of this species could be improved by tree breeding programs. In addition, only low correlation coefficients were obtained between the growth characteristics and SWV, indicating that extensive selection on SWV in tree breeding programs may not always lead to a reduction in yield volume.
Agung Prasetyo,Ryota Endo,Yuya Takashima,Haruna Aiso,Fanny Hidayati,Jun Tanabe,Futoshi Ishiguri,Kazuya Iizuka,Shinso Yokota 강원대학교 산림과학연구소 2015 Journal of Forest Science Vol.31 No.3
Zelkova serrata is an important hardwood species for the timber industry in Japan. Tree breeding programs for this species have mainly focused on growth characteristics such as stem diameter (D), tree height (TH), stem form, and branching. In order to fulfill timber industry needs, wood quality improvement should be included in the tree breeding program of this species. In the present study, growth characteristics, such as D and TH, and the stress- wave velocity (SWV), which is highly correlated with Young’s modulus of wood, were measured for 20-year-old Z. serrata from eight half-sib families planted in a progeny test site with three different initial spacings. Significant differences in all the measured characteristics were found among the eight half-sib families. The variance components of the half-sib families for D, TH, and SWV were 27.2%, 47.3%, and 33.5%, respectively. These results indicate that all the measured characteristics of this species could be improved by tree breeding programs. In addition, only low correlation coefficients were obtained between the growth characteristics and SWV, indicating that extensive selection on SWV in tree breeding programs may not always lead to a reduction in yield volume.
Preliminary evaluation of anatomical characteristics of four common Mongolian softwoods
Sarkhad Murzabyek,Ishiguri Futoshi,Nezu Ikumi,Aiso Haruna,Ngadianto Agus,Tumenjargal Bayasaa,Baasan Bayartsetseg,Chultem Ganbaatar,Ohshima Jyunichi,Yokota Shinso 한국산림과학회 2022 Forest Science And Technology Vol.18 No.3
To effectively and sustainably utilize wood resources from boreal forests in Mongolia, ana- tomical characteristics, tracheid morphology, cell proportion, annual ring width, and late- wood percentage were preliminary determined in Pinus sylvestris, Pinus sibirica, Picea obovata,andLarix sibirica trees naturally growing in Mongolia. Based on the observation, the anatomical characteristics of four common Mongolian softwoods were the same as those previously observed in the same species or the same genus species. Based on the parame- ters of the Gompertz functions for annual ring width, silvicultural management, such as thin- ning timing and harvesting age, should be considered depending on the species when the plantation is established. The results of the model selection for relationships between late- wood percentage and basic density indicated that the increase ratio of basic density corre- sponded to an increase of latewood percentage is almost the same irrespective of species, although there are species-specific values of basic density corresponding to specific late- wood percentages. The results obtained in the present study contribute effective and sus- tainable utilization of wood resources from Mongolian forestry.