兴安落叶松3种林型林分生长模型的研究

STUDY ON GROWTH MODEL OF THREE FOREST TYPES OF Larix Gmelinii

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。

It is difficult to measure the age of the trees because of the complexity of the forest stands. The average age of the trees is estimated by the average diameter of the trees. The average tree height, average tree height and the growth model per hectare of hectares are constructed. It is necessary to estimate the future growth status and characteristics of standings and to guide the rational operation of local Larix gmelinii stands. The results showed that the age and diameter of Larix gmelinii were the same, and the age and diameter of the three forest stands were the same as the average diameter And the relationship between stand age and volume per unit area. The results showed that there was a positive correlation between the age and diameter of Larix gmelinii trees, and the rela- tionship between age and DBH and accumulation was the best choice. The relationship between age and tree height was obtained by using the quadratic function For more appropriate.