不同林龄杉木林胸径与树高对冠幅特征因子的影响  

Effects of DBH and the Tree Height on Crown Width Characteristic Factors in Different of Cunninghamia Lanceolata Forests

作　　者：孙宇 杜莉 蒋群星 李际平[3] 曹小玉[3] SUN Yu;Du Li;JIANG Qun-xing;LI Ji-ping;CAXiao-yu(Sichuan Forestry Exploration and Design Institute,Chengdu 610081,China;Sichuan Forestry and Grassland Survey and Planning Institute,Chengdu 610081,China;Central South University of Forestry&Technology,Changsha 410004,China)

机构地区：[1]四川省林业勘察设计研究院,四川成都610081 [2]四川省林业和草原调查规划院,四川成都610081 [3]中南林业科技大学,湖南长沙410004

出　　处：《四川林勘设计》2021年第4期23-27,共5页Sichuan Forestry Exploration and Design

基　　金：湖南省自然基金面上项目(2018JJ2673);国家“十二五”科技支撑项目(2012BAD22B0505)。

摘　　要：为研究杉木林胸径与树高对冠幅生长的影响作用,探讨胸後与树高对冠幅特征因子的作用机理及其关系。以湖南省福寿国有林场30块杉木林样地为研究对象,样地按年龄A矣10年(幼龄林),10年<A≤20年(中龄林),A>20年(成熟林)划分为3个等级,分析不同等级林分中杉木冠幅的分布结构,同时利用通径分析的方法分析不同林龄阶段林分的胸径和树高对冠幅因子的影响。结果表明,随着林分年龄增大,胸径、树高和冠幅特征因子均逐渐增大,胸径在不同林龄阶段的增长率分别为218%、62%,胸径增长快速是在幼龄林到中龄林这一阶段;树高在不同林龄阶段的增长率分别为208%、57%,树高增长快速也是在幼龄林到中龄林这一阶段;3种林分类型的冠幅大小在0.35~5.5m之间,平均冠幅的大小依次为成熟林>中龄林>幼龄林,冠幅在各个林龄阶段的增长率分别为116%、36%,冠幅的增长主要是在幼龄林至中龄林时期。冠幅与胸径、树高总体呈正比,中龄林跟成熟林较明显。胸径与树高均对冠幅均有正向作用,但是胸径对冠幅的影响比较显著,且随着林分的发育,正向作用的强度也随之变化。杉木胸径和树高对冠幅特征因子均有影响,但胸径对冠幅特征因子的作用更加显著,在快速获取杉木冠幅因子的值时采用胸径估测比采用树高估测更为准确。In order to study the effect of DBH and the tree height on crown width characteristic factors of Cunninghamia Lanceolata forests,and to explore the mechanism and relationship of DBH and tree height on crown characteristic factors.Taking 30 sample plots of Cunninghamia lanceolata forest in Fushou state-owned forest farm of Hunan Province were taken as the research object,the plots were divided into three grades according to age a≤10 years(young forest),10 years<a≤20 years(middle-aged forest)and a>20(mature forest).The distribution structure of Cunninghamia Lanceolata crown width in different forest grades was analyzed,and the effects of DBH and the tree height on crown width were analyzed by path analysis.The results showed that the characteristic factors of DBH,the tree height and crown width increased gradually with the increase of stand age,and the growth rates of DBH at different age stages were 218%and 62%respectively,and the rapid growth of DBH was from young forest to middle-aged forest;The growth rates of the tree height in different age stages were 208%and 57%,respectively.The rapid growth of tree height was also in the stage from young forest to middle-aged forest;The crown sizes of the three forest types ranged from 0.35 to 5.5 m,and the average crown sizes were mature forest>middle-aged forest>young forest.The growth rates of crown sizes in each forest age stage were 116%and 36%,respectively.The growth of crown sizes was mainly from young forest to middle-aged forest.In general,the crown width was directly proportional to DBH and the tree height,and the middle-aged forest was more obvious than the mature forest.Both DBH and the tree height had positive effects on crown width,but DBH had a significant effect on crown width,and with the development of stand,the intensity of positive effect also changed.DBH and the tree height had influence on the characteristic factors of crown width of Cunninghamia Lanceolata,but DBH had more significant effect on the characteristic factors of crown width.It was mor

关 键 词：杉木林 冠幅 胸径 树高 通径分析 

分 类 号：S71[农业科学—林学]