摘要
2016年6月,对引种于景宁县草鱼塘林场中山区的35年生日本扁柏Chamaecyparis obtusa,日本花柏Chamaecyparis pisifera和日本香柏Thuja standishii 3个树种纯林林分直径进行调查,分析其直径分布规律。结果表明,3个树种纯林径阶多集中分布在16~26 cm径阶,林分平均胸径最大为日本香柏;大径木比率从大到小依次为日本花柏>日本香柏>日本扁柏;林木总断面积从大到小分别为日本香柏(69.79 m^2·hm^-2)>日本花柏(58.29 m^2·hm^-2)>日本扁柏(42.16 m^2·hm^-2);3个树种偏度系数绝对值从大到小分别为日本香柏(0.47)>日本扁柏(0.39)>日本花柏(0.03)。利用正态分布函数和Γ分布函数分别对3个林分进行直径分布拟合和卡方检验,日本扁柏、日本花柏林分直径均符合正态分布函数,其中日本扁柏还服从Γ分布函数。研究结果表明,3个树种林分生长均有较好的适应性,在林分经营过程中,可选用正态分布函数作为日本扁柏、日本花柏等树种的株数分布预测函数指导林分间伐,使林木直径结构达到最佳状态。
Investigations were implemented in June 2016 on diameter of 35-year pure forest plantation of Chamaecyparis obtuse,C.pisifera and Thuja standishii in Jingning,Zhejiang province.The results showed that the diameter class of three species plantation distributed mostly in 16-26 cm,T.standishii plantation had the maximum mean DBH.The average rate of large diameter tree was ordered by C.pisifera>T.standishii>C.obtuse.Total basal area of different plantations was followed by T.standishii(69.79 m^2·ha^-2)>C.pisifera(58.29 m^2·ha^-2)>C.obtuse(42.16 m^2·ha^-2).Absolute value of skewness of 3 different plantations was as follows:T.standishii(0.47)>C.pisifera(0.39)>C.obtuse(0.03).Diameter distribution of three plantations was fitted and chi square tested by normal and gamma distribution function,it demonstrated that C.obtuse and C.pisifera stand had normal distribution function,while C.obtuse also obeyed the gamma function.The investigation resulted that 3 species had good adaptability of growth in Jingning.Normal distribution function was recommended for thinning of C.obtuse and C.pisifera plantation.
作者
徐端妙
葛永金
袁位高
刘日林
朱锦茹
林坚
焦洁洁
蓝巧美
XU Duan-miao;GE Yong-jin;YUAN Wei-gao;LIU Ri-lin;ZHU Jin-ru;LIN Jian;JIAO Jie-jie;LAN Qiao-mei(Jingning Forest Farm of Zhejiang,Jingning 323500,China;Lishui Academy of Forestry of Zhejiang,Lishui 323000,China;Zhejiang Academy of Forestry,Hangzhou 310023,China;Liandu Forestry Farm of Lishui,Lishui 323000,China)
出处
《浙江林业科技》
2019年第6期7-11,共5页
Journal of Zhejiang Forestry Science and Technology
基金
浙江省景宁县重点科技项目(2017A02)
浙江省重大科技专项(2015C02016)。
关键词
日本花柏
日本香柏
日本扁柏
直径结构
正态分布
Chamaecyparis obtuse
C.pisifera
Thuja standishii
diameter distribution
normal distribution
