Moya Róger, Tenorio Carolina, Villalobos-Barquero Verónica, Meza-Montoya Alejandro
Escuela de Ingeniería Forestal, Instituto Tecnológico de Costa Rica, Apartado, 159-7050, Cartago, Costa Rica.
Heliyon. 2024 Dec 12;11(1):e41210. doi: 10.1016/j.heliyon.2024.e41210. eCollection 2025 Jan 15.
Physical properties were studied in commercial plantation of balsa established in Costa Rica. Among other variables studied, physical properties varied mainly for tree age, spacing, stand density, diameter, and height of trees, which we named dasometric conditions. The aim of this study was (i) to determine the variation of specific gravity (SG), air-dry density (AD), green density (GD), and green moisture content (GMC), (ii) to know the site effect and dasometric conditions on these properties, and (iii) to establish the relationship between the four physical properties. The results showed that: SG from 0.08 to 0.21, AD from 90 to 250 kg/m, GD varied 203-274 kg/m, and GMC from 38.8 to 137.1 %. Tree age affected statistically all physical properties, it was positively correlated with SG, AD, and GD, but negatively correlated with GMC. Diameter breast height and total height were weakly correlated with SG and AD, respectively. Commercial height and stand density were highly correlated with SG and AD, besides stand density was positively correlated with GMC. AD was positively correlated with SG and GD but negatively correlated with GMC. According to the results, balsa tree plantations exhibited significant variation in physical properties (SG, AD, GD, and GMC) in trees aged between 30 and 40 months and this variation was primarily attributed to the site-specific growth conditions, mainly temperature and precipitation. These wood properties can be selected by site and growing conditions.
对在哥斯达黎加建立的轻木商业种植园的物理性质进行了研究。在研究的其他变量中，物理性质主要因树龄、间距、林分密度、树木直径和高度而有所不同，我们将这些称为测树学条件。本研究的目的是：（i）确定比重（SG）、气干密度（AD）、生材密度（GD）和生材含水率（GMC）的变化；（ii）了解立地效应和测树学条件对这些性质的影响；（iii）建立这四种物理性质之间的关系。结果表明：SG为0.08至0.21，AD为90至250kg/m³，GD在203 - 274kg/m³之间变化，GMC为38.8%至137.1%。树龄对所有物理性质均有统计学影响，与SG、AD和GD呈正相关，但与GMC呈负相关。胸径和总高度分别与SG和AD呈弱相关。商业高度和林分密度与SG和AD高度相关，此外林分密度与GMC呈正相关。AD与SG和GD呈正相关，但与GMC呈负相关。根据结果，轻木人工林在30至40个月龄的树木中，物理性质（SG、AD、GD和GMC）表现出显著差异，这种差异主要归因于特定立地的生长条件，主要是温度和降水。这些木材性质可以根据立地和生长条件进行选择。
