六盘山林区林分直径分布模型研究  

THE STUDY ON STAND STEM NUMBE-DIAMETER DISTRIBUTION IN FOREST DSSTRICT OF LIUPAN MOUNTAINS

作　　者：李晓慧[1] 陆元昌[1] 袁彩霞[1] 雷相东[1] 孟京辉[1] 王新民[1] 

机构地区：[1]中国林科院资源信息所,北京100091

出　　处：《内蒙古农业大学学报（自然科学版）》2006年第4期68-72,共5页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

摘　　要：林木直径分布是林分测量和开展森林经营活动最基础的信息。由于受多种因素影响,不同森林类型、立地条件,其直径分布型有较大差异。本次研究以六盘山林场3种主要的森林类型的调查数据为基础,有针对性选择了7种直径分布函数(负指数函数、限定线函数、倒J形对数函数、威布尔函数、幂指数函数、逻辑斯特分布函数和正态分布函数)进行模拟和检验,发现这3种主要森林类型的直径分布都呈现出对称分布的趋势,但略有不同:华北落叶松林对称分布趋势最强,椴、栎混交林同时呈现出递减分布的趋势,桦树混交林对称分布趋势不强,但同时也未呈现递减趋势。It is key to know the stand stem number - diameter distribution for forest management. Influenced by many factors, the stem number - diameter distributions in different eases have different characteristics. Areas of this study are located in 3 forestry farms （Xixia, Erloaghe, Wanghanan） of Forestry Bureau, Liupan Mountain region of Ningxia province in the Northwest China. The Liupan Mountain is a typical representative area of water - limited forest ecosystem sited and is very important conservation forests for water resources in the Northwest China. The purposes of this study is to seek the characteristics of stand stem number - diameter distribution of three typical forests in this area. The data of this study was gained by field plots survey between 2004 and 2005. And the results showed that Larix prinncipis - rupprechtii plantation forest is distinct normal stem number - diameter distribution. The mixed forest of Tilia spp. and Quercus liaotungensis is a normal stem number - diameter distribution with dumped form in forest, and it＇s still in the initial stages of forest succession. The mixed forest of Betula platyphylla was close to normal stem number - diameter distribution.

关 键 词：直径分布模型 华北落叶松林 椴、栎混交林 桦树混变林 

分 类 号：S791.248[农业科学—林木遗传育种]