摘要
分别以立地指数7和10建立了林木胸径和冠幅、胸径与林龄的回归方程,确定了林木的合理营养空间,进而确定出塞罕坝地区华北落叶松人工林的合理密度。结果表明:密度越大立地越好的样地,需要开始间伐的年龄越早。当落叶松达到30年左右的树龄时,林分合理密度为800株/hm2～1 000株/hm2。
Larix principis-rupprechtii plantation is the main body of forest management in Saihanba Mechanical Forest Center. Now there are 34 000 hm^2, which accounts for more than half of the whole forest area. Therefore, it is of great importance to study the appropriate management density of Larix principis-rupprechtii plantation, in order to provide scien- tific basis for management and control of Larix principis-rupprechtii plantation. In this paper, the regression equations of site index 7 and 10 among DBH, crown-width,and stand age were respectively established. We got tree＇s appropriate nutrition space and compiled the stand management density table of Larix principis-rupprechtii plantation in Saihanba forest center based on the above regression equations. Results showed the larger stand density and site index, the earlier stand need of thinning for the first time. When Larix principis-rupprechtii plantation is about 30-year-old, the appropriate management density needs to be 800/hm^2-1000/hm^2.
出处
《河北林果研究》
2012年第4期380-384,共5页
Hebei Journal of Forestry and Orchard Research
关键词
塞罕坝
华北落叶松人工林
合理密度
Saihanba
Larix principis-rupprechtii plantation
rational density
