摘要
对17年生杉木×乳源木莲混交试验林中的乳源木莲冠层特性与材积生长进行相关分析,结果表明:乳源木莲材积指数(VI)与各冠层因子间的相关系数不同,除叶面积指数(LAI)、冠层密度(CLD)外,单株总叶面积(TLA)、树冠表面积(TCA)及冠形率(CSR)与材积指数均达极显著正相关。通径分析表明:TCA对材积生长的直接作用最大(Pyxi=1.201 3),是木莲材积生长的主导因子,TLA、CLD、CSR通过TCA起作用,5个主要冠层参数对乳源木莲材积生长相对重要性的大小顺序依次为TCA,LAI,TLA,CSR,CLD。在分析冠层空间结构对材积生长的影响中发现:垂直方向上,冠层中、下层的叶面积对材积生长有决定性作用;水平方向上,以叶面积多分布于内部、外部的结构有利于乳源木莲材积生长,而中部叶面积的作用较小。
The stands of 17-year-old Manglietia yuyuanensis Law. mixed with Chinese fir were researched by analysing the relationship between crown characteristics and growth of M. yuyuanensis Law. The results showed that the stemwood growth index（VI） was positively related to the total leaf area（TLA）, surface area of crown（TCA） and crown shape ratio（CSR）, but negatively related to the leaf area index（LAI） and crown layer density（CLD）. The path analysis showed that TCA had the biggest direct effect（Pyxi = 1. 201 3）on the stemwood growth. In the five main growth parameters of crown layer, based on the importance of relationships with stemwood growth, the order of them was TCA, LAI, TLA, CSR and CLD. The effects of spatial configuration of crown and stemwood growth were analysed. It showed that in the vertical distribution of crown foliage, the down and middle layer was decisive to the stemwood growth, the role of upper layers was secondary. In the horizontal distribution, inner and outer parts had the great contribution to the growth, but the middle parts had less. The study of reasonable crown structure of M. yuyuanensis could be used to direct the big timber cultivation of M. yuyuanensis.
出处
《南京林业大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第6期57-60,共4页
Journal of Nanjing Forestry University：Natural Sciences Edition
基金
福建省211重点学科资助项目
福建省科技厅重点科研项目(99-Z-173)
关键词
乳源木莲
冠层特性
通径分析
Manglietia yuyuanensis Law.
Crown characteristics
Path analysis
