Pemodelan Variasi Longitudinal Sifat Fisika dan Mekanika Bambu Petung (Dendrocalamus asper) yang berasal dari Hutan Rakyat di Yogyakarta

Abstract

Despite the increasing utilization of bamboo as a sustainable substitute for wood, information regarding the longitudinal variation of physical and mechanical properties of Dendrocalamus asper grown in Indonesian community forests remains limited. This study aims to evaluate the longitudinal variation of physical and mechanical properties based on linear and non-linear mixed-effects modelling for Dendrocalamus asper Backer grown in community forests, Yogyakarta, Indonesia. The results showed that the logarithmic model best explained most physical and mechanical properties of D. asper, whereas modulus of rupture (MOR) and compressive strength parallel to the grain were better represented by the quadraic model. The logarithmic model indicated that most properties of D. asper either increased or decreased from the base section and gradually stabilized towards the upper culm. In contrast, the quadratic model demonstrated that MOR and compressive strength parallel to the grain increased from the base to the middle sections before slightly decreasing towards the top of the culm. These findings indicate that the middle and upper culms sections possess higher values of most physical and mechanical properties than the base section, suggesting greater potential for structural applications. In addition, despite several trait-specific exceptions, the basic density and wall thickness of bamboo can serve as useful indicators of the physical and mechanical properties of D. asper.