不同坡位华北落叶松人工林生长规律研究

以河北省木兰围场国有林场管理局下属的孟滦林场的华北落叶松（Larix principis—rupprechtii Mayr．）为研究对象，采用空间代替时间的方法，借助Excel和ForStat统计分析软件，分析不同坡位华北落叶松树高、胸径以及材积变化规律，以掌握树木个体生长的基本规律。研究结果表明：华北落叶松各生长因子在生长过程中都会出现二次生长，树高和胸径的连年生长量在10年达最大值，而材积连年生长量在20年达最大值，在25年各因子同时出现二次生长。华北落叶松平均树高生长量最大为0．7m，平均胸径生长量最大为0．78cm，平均材积生长量为0．00629m^3。

Study on the growth variation of Larix principis-rupprechtii Mayr.plantation at different locations

It is very important for scientific forestry management to understand and grasp the forest growth systematically. In this study, the Larix principis-rupprechtii Mayr. of Mulan-Weichang Forest Administration of Heibei Province was researched as an object with the method space instead of time, and the variation of Larix principis-rupprechtii Mayr. at height, DBH and stem volume on different slopes was analyzed with Excel and Forstat sta-tistical analysis software to interpret the growth variation of individual trees. The results showed that there exists secondary growth of growth factors in the 25 year growth process of Larix principis-rupprechtii Mayr.. The current annual increment of height and DBH rea-ches the maximum of 0.70m and 0.78cm in 10 years,respectively while the current annual in-crement of stem volume reaches the maximum of 0. 006 29 m^3 in 20 years.