Changes in the intensity of heartwood formation in Scots pine (Pinus sylvestris L.) ontogenesis

An essential stage in woody plant ontogeny (heartwood (HW) formation) determines tree resistance to weather conditions, wood quality (moisture, colour, resistance to biodegradation), and regulates the proportion of functionally active sapwood (SW) in the total trunk biomass. In this study, the patterns of HW formation depending on tree age and cambial age within the same tree were studied in the North-West of Russia in Scots pine in a lingonberry pine forest. It is shown that HW either repeats the trunk profile or shows a maximum proportion on average at the height of 1.5 m. Models using the square root transformation and logarithm transformation have been proposed to predict the number of annual rings in HW depending on the cambial age. Multiple regression is proposed to predict the radial width in HW. Validation of the developed models on random trees gave a good result. HW formation begins at the age of 17–18 years and continues at the rate of 0.3 rings per year for 20–30-year-old tr..., ,

木本植物个体发育的关键环节——心材（heartwood, HW）形成过程，决定了树木对环境条件的抗性、木材品质（含水率、色泽及抗生物降解性能），并调控具有功能活性的边材（sapwood, SW）在树干总生物量中的占比。本研究以俄罗斯西北部越橘松林内的欧洲赤松为研究对象，探究了单株树木内心材形成模式随树龄与形成层年龄的变化规律。研究表明，心材要么与树干轮廓保持一致，要么在树高1.5米处呈现平均占比峰值。本研究构建了基于平方根变换与对数变换的模型，用于根据形成层年龄预测心材内的年轮数量；同时提出多元回归模型以预测心材的径向宽度。通过随机选取的树木对所构建模型进行验证，结果表现优异。心材形成始于树龄17~18年，并在树龄20~30年的树干中以每年0.3个年轮的速率持续进行……