Taper and individual tree volume equations of Eucalyptus varieties under contrasting irrigation regimes

作者：Juan Carlos Valverde, Rafael A. Rubilar, Alex Medina, Oscar Mardones, Verónica Emhart, Daniel Bozo, Yosselin Espinoza, Otávio Camargo Campoe · 发表于：New Zealand journal of forestry science · 年份：2022 · DOI：10.33494/nzjfs522022x181x · 被引用次数：8 · 研究领域：Forest ecology and management、Plant Water Relations and Carbon Dynamics、Seedling growth and survival studies

Background: Compatible taper and volume equations are key for traditional growth and yield and current process-based or hybrid models. However, most equations do not consider variables such as genotype, water regime and their interaction, limiting the development of general equations for species or regions. Our research investigated taper and individual tree volume equations for eight Eucalyptus genotypes (E. nitens, E. badjensis, E. smithii, E. camaldulensis x globulus and two varieties of low and high productivity of E. globulus and E. nitens x globulus), all materials are growing under summer irrigated vs. no irrigated conditions. Methods: A 7-year old Eucalyptus plantation experiment was sampled considering four representative trees per genotype x water regime combination treatment. Four non-linear taper equations were evaluated: Kozak (2004), Kozak et al. (1969), Ormerod (1973) and Max and Burkhart (1976). In addition, total and merchantable volume was evaluated with the Schumacher and Hall (1933) equation. The effect of genotype, irrigation regime and interaction were evaluated for each equation. Then, the best taper equation was selected from adjusted coefficient of determination, mean square error, and AIC and BIC parameters. Finally, the validation of evaluations was carried out with the Leave-One-Out Jackknife method. Results: Genotype, irrigation regime, or the interaction were not statistically significant for all evaluated taper - volume equations and a generalis...