摘要
利用荥经县12个天然林固定样地3次(10年)的调查数据,选取林分密度、平均直径、生长率、各树种(组)重要值、混交度、大小比、角尺度等参数,研究天然林林分结构变化。结果表明,林分平均密度总体呈下降趋势,并趋于稳定;平均直径、平均综合净生长率呈增大趋势;高大乔木树种(组)重要值逐渐减小,中小乔木重要值逐渐增大;混交度、大小比、角尺度差值较小,总体呈下降趋势。林木处于随机分布,各树种种内之间的竞争较为激烈,天然林林分质量总体呈上升趋势。
Based on the data of 3 times(10 years)investigation in 12 natural forest fixed sample plots in Yingjing County,the parameters such as stand density,average diameter,growth rate,important value of each tree species(group),mixed degree,size ratio and angle scale were selected to study the structural change of natural forest.The results showed that the average density of the stand decreased and tended to be stable,the average diameter and the average comprehensive net growth rate increased,the important values of the tall tree species(groups)decreased,the important values of the small and medium trees increased,the differences of mixed degree,size ratio and angle scale were small,and the overall value decreased.The trees were in random distribution,the competition among all species of trees was intense,and the quality of natural forest stands was on the rise.
作者
代顺民
黄贝贝
唐巍
DAI Shunmin;HUANG Beibei;TANG Wei(Sichuan Institute of Forestry and Grassland Inventory and Planning,Chengdu 610081,China)
出处
《林业调查规划》
2019年第6期23-29,共7页
Forest Inventory and Planning
关键词
天然林
林分结构
变化趋势
荥经县
nature forest
stand structure
change trend
Yingjing County
作者简介
第一作者:代顺民(1966-),男,四川营山人,高级工程师.主要从事林业调查规划设计研究工作.Emall:550576514@qq.com。
