Mathematical Expression of Internode Characteristics of Yellow Ampel Bamboo (“Bambusa vulgaris” var. Striata)

Abstract

Most bamboo research has focused on growth performance, physic-chemical attributes, and biomass estimation. There are few studies on elaborating the biometrics of bamboo, especially in internodes mathematical expression. In this study, we revealed the mathematical expression of bamboo internode along the culm. We used 30 samples of culms and cut each culm by its internodes. A total of 928 sample internodes were measured for the outer diameter, wall thickness, and length of internodes. The findings showed that the mathematical expression for two-dimensional culm morphometric was a two and three-order function. In contrast, the three and four-dimensional culm morphometric were a four-order function. Moreover, the relationship between relative internode number (RIN) and relative internode length (RIL), and relative cumulated internode length (RCIL) showed a third-order function.