摘要
为探讨毛竹天然混交林的林分空间结构特征,对不同林分组成的天然混交林生长因子进行了调查。结果表明:毛竹天然混交林的空间利用比较合理,群体结构相对稳定,其中8竹1杉1阔混交林林分密度和平均胸径较适中,分别为1 970株/hm^2和10.8 cm,平均冠幅、竹冠空间分布容积和竹冠水平分布面积以及竹叶面积、叶面积指数等因子均大于纯竹林,分别为纯竹林的111.7%、118.5%和130.5%以及111.4%、111.4%;7竹3杉+阔混交林林分密度和平均胸径次之,分别为1 542.2株/hm^2和10.1 cm,平均冠幅、竹冠空间分布容积和竹冠水平分布面积均大于纯竹林,分别为纯竹林的114.7%、107.8%和100.0%,叶面积指数与纯竹林相差甚小,竹林生长良好,体现了冠幅与胸径、林分密度之间的密切相关规律。不同林分组成的天然混交林各种树冠水平分布面积均大于纯竹林的树冠水平分布面积,其中4竹4松1杉1阔混交林的树冠水平分布面积最大,为6 861.2 m^2/hm^2,是纯竹林的17.48倍,对光利用率较高,生产的物质较多。
To explore the stand spatial structure characteristics of natural moso bamboo （phyllostachys pubesens ） mixedforest,the investigation of growth factors was carried out for the mixed forest with different composition. The results indicated that the spatial use is reasonable and the group structure is relatively stable in the natural mixed forest. Among these,the mixed stand with bamboo,Chinese fir and broadleaved species of 8-1-1 has the moderate density of 1 970 plants/ha and average diameter at breast height （DBH） of 10. 8 cm; the average crown breadth, bamboo crown space distribution volume and crown level distribution area,bamboo leaf area, and leaf area index are greater than pure bamboo forest, which are 111.7%,118.5%,130. 5 % and 111. 4 % respectively. The mixed forest with 7 bamboo,3 Chinese fir and broadleaved species has the stand density of 1 542. 2 plants/ha and average DBH of 10. 1cm,which are only next to that of above mentioned mixed forest, which are respectively the average crown breadth, bamboo crown space distribution volume and bamboo canopy level distribution area are greater than those of pure bamboo forest,which are 114. 7%,107. 8% and 100.0% respectively,while the leaf area index remains less gap from that of pure bamboo. In this forest,bamboos grow well,which also reflects the closely related rule between crown,DBH and stand density. The horizontal distribution of canopy area in the natural mixed forest with different composition is higher than that of pure bamboo forest, the largest one is 6 861. 2 m^2/h a in the mixed forest with bamboo, pines,Chinese fir and broadleaved species of 4-4-1-1,which is 17. 48 times of that in pure bamboo forest, and owns higher rate of light utilization and produces more material.
作者
明曙东
粟星宏
顾扬传
林斌
曹流清
粟林丽
杨立新
林世友
Ming Shudong Su Xinghong Gu Yangchuan Lin Bin Cao Liuqing Su Linli Yang Lixin Lin Shiyou(Huitong Forestry Bureau,Huitong 418300, Hunan, China Huitong Forestry Institute, Huitong 418300, Hunan, China)
出处
《世界竹藤通讯》
2016年第5期1-6,共6页
World Bamboo and Rattan
基金
湖南省怀化市林业科技推广项目[编号:怀发(2002)06]
湖南会同县楠竹低改顶目[编号:中会农(2000)04]
关键词
毛竹
天然混交林
空间结构
纯竹林
湖南省会同县
phyllostachys pubesens , natural mixed forests, spatial structure, pure bamboo forest, Huitong,Hunan Province
