太岳林区华北落叶松生长过程研究

Study on Growth Process of Larix principis-rupprechtii Mayr in Taiyue Forest Region

为了了解太岳林区华北落叶松人工林的生长动态,为华北落叶松的科学经营管理提供技术参考和理论依据,笔者对太岳林局七里峪林场华北落叶松人工林解析木进行了研究,分析了华北落叶松的生长过程,建立华北落叶松人工林树高、胸径、材积的生长模型。结果表明,适合胸径生长过程的最优模型为Korf方程,适合树高、材积生长过程的最优模型为Richards方程,决定系数R2值均大于0.99.华北落叶松胸径的连年生长量在第9 a达到最大值0.95 cm,连年生长量曲线与平均生长量曲线相交在第17 a.树高连年生长量在第9年达到了最大值,9 a^12 a连年高生长量相同,连年生长量曲线与平均生长量曲线相交在第16 a.材积在9 a^15 a时连年生长量快速增长,15 a^21 a时连年生长量逐渐减缓;此后,在21 a^27 a时,连年生长量又呈现快速增长的趋势;直到第27 a,华北落叶松材积的连年生长量曲线与平均生长量曲线没有相交,说明七里峪林场的华北落叶松林分还没有达到成熟期,正处于生长期。

In order to understand the growth dynamics of Larix principis-rupprechtii Mayr plantation in Taiyue forest region and provide technical reference and theoretical basis for the scientific management of Larix principis-rupprechtii Mayr,the growth process of Larix principis-rupprechtii Mayr was analyzed and the growth models of its height,DBH and volume were established by carrying out Larix principis-rupprechtii Mayr plantation forest stem analysis in Qiliyu forestry farm of Taiyue forest region. The results showed that the optimal models for DBH growth process was Korf equation,and the optimal models for tree height and volume growth were Richards equation whose values of determination coefficient( R2) were greater than 0. 99. The annual growth amount of DBH reached the maximum of 0. 95 cm at 9 a and growth curve intersected with the average growth at 17 a. The highest growth rate of the tree height reached the maximum at 9 a,and the growth rate in9 years to 12 years was same. The growth curve of height and the average growth curve intersected at 16 years. The annual growth rate of volume showed a rapid growth from 9 a to 15 a and gradually slowed down from 15 a to 21 a. Then the annual growth rate showed another rapid growth from 21 a to 27 a. Until 27 a the annual growth curve of Larix principis-rupprechtii Mayr did not intersect with the average growth curve,which indicated that the Larix principis-rupprechtii Mayr forest in Qiliyu forestry farm had not reached the mature stage and was in the growth period.