Recently, production of teak wood has been decreased and failured to fulfill market demands. Improvement in silviculture treatment shortened teak rotation turning it into fast growing species with the wood quality similar to its origin. Most of research on wood quality of teak (Tectona grandis L.f.) were focused on determining physical properties (density and specific gravity), wood structure (fiber dimension and Microfibril Angle (MFA)) and mechanical properties (Modulus of Elasticity, MOE and Modulus of Rupture, MOR). Variation in terms of wood qualities was widely observed. However, understanding the causes of the variation patterns of wood quality at the nano level is still lacking. This research aims to analyze growth variation and wood quality (nanostructure) from two different spacings (3 m x 3 m and 2 m x 6 m) and two different origins of clones, i.e Cepu and Madiun. The teak samples were taken from 7-years-old clonal trials in the research site of Watu Sipat Forests, Biotechnology and Forest Tree Improvement Research Facilities in Yogyakarta. Results showed that fenotype does not affect wood quality. Nanostructure of fast growing teak has influenced wood strength and durability. MOE was influenced by density, MFA, degree of crystallinity and width of cellulose crystallites. Apart of these findings, this research also highlighted the presence of preservative that could be detected in cell wall of wood through structure and dimension of cellulose crystallinity. In conclusion, wood quality characteristics from clone of Madiun was better than that of clone of Cepu, particularly at the spacing of 2 m x 6 m. This spacing, therefore, is considered importantly for economic, ecological and wood quality cloned teak development
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机译：近来，柚木的生产已经减少并且不能满足市场需求。造林处理的改进缩短了柚木的旋转，使柚木成为速生树种，木材质量与原木相似。柚木（Tectona grandis Lf）木材质量的大部分研究都集中在确定物理性能（密度和比重），木材结构（纤维尺寸和微纤丝角（MFA））和机械性能（弹性模量，MOE和模量）上。破裂，MOR）。广泛观察到木材品质的变化。但是，仍然缺乏对纳米级木材质量变化模式的原因的认识。这项研究旨在分析来自两个不同间距（3 m x 3 m和2 m x 6 m）以及两个不同克隆源（即Cepu和Madiun）的生长变化和木材质量（纳米结构）。柚木样品取材于日惹的Watu Sipat森林，生物技术和林木改良研究设施的7年克隆试验。结果表明，fenotype不影响木材质量。快速生长的柚木的纳米结构影响了木材的强度和耐久性。 MOE受密度，MFA，结晶度和纤维素微晶宽度的影响。除了这些发现之外，这项研究还强调了可以通过纤维素结晶度的结构和尺寸在木材细胞壁中检测到的防腐剂的存在。总之，Madiun克隆的木材质量特征要优于Cepu克隆的木材质量特征，尤其是在2 m x 6 m的间距处。因此，对于经济，生态和木材品质的克隆柚木开发而言，此间距至关重要。
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