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由于复层异龄林林分结构较复杂,对林木年龄的测定难度很大,通过林木径阶估算林木平均年龄,构建林分平均胸径、平均树高和每公顷公顷蓄积量的生长模型,来预估林分未来的生长状态和特征,对当地兴安落叶松林分的合理经营有一定的指导意义。以兴安落叶松为研究对象,利用201株解析木数据,选择12种生长方程分别对兴安落叶松林木年龄与径阶关系,3种林型林分年龄与平均胸径、林分年龄与平均树高和林分年龄与单位面积蓄积量的关系进行分类拟合。结果显示,兴安落叶松林木年龄与径阶之间存在正相关,并呈一定的规律性变化;年龄与胸径,蓄积的关系采用生长函数是最佳选择;年龄与树高的关系利用二次函数为更合适。
Because of the complex structure of stratified ancestral forest, it is very difficult to measure the age of the tree. The average age of the tree is estimated by the tree diameter class, and the growth model of average DBH, average tree height and hectare per hectare is constructed It is instructive to predict the future growth status and characteristics of the forest stand, which will be helpful for the reasonable management of the forest stand. Taking Larix gmelini as the research object, this paper analyzed the relationship between age and diameter of Larix gmelinii forest by using 201 analytical tree data and 12 growth equations. The results showed that age, average DBH, stand age and mean tree height And the stand age and unit area volume of the relationship between the classification and fitting. The results showed that there was a positive correlation between age and diameter order of Larix gmelinii forest, and showed a certain regularity. The relationship between age and DBH and growth was the best choice for the growth function. The relationship between age and tree height was calculated by quadratic function For more appropriate.