摘要
对17年生混交试验林(杉木×乳源木莲)中的乳源木莲冠层特性与单株材积生长进行相关分析,结果表明:乳源木莲单株材积指数D2H与各冠层因子间的相关系数不同,除单株叶面积指数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与单株材积指数均达极显著正相关。通径分析表明:TCA对单株材积生长的=1 2013),是乳源木莲单株材积生长的主导因子,TLA、CLD、CSR是通过TCA起作用的,以上5直接作用最大(Pyxi个主要冠层参数对乳源木莲单株材积生长相对重要性的大小为:TCA>LAI>TLA>CSR>CLD。在分析冠层空间结构对单株材积生长的影响中发现:垂直方向,冠层中、下层的叶面积对单株材积生长有决定性作用,而上层作用较小;水平方向,以叶面积多集中于内部、外部的有利于乳源木莲单株材积生长,而中部叶面积作用较小。
The correlation analysis on crown characterstics and individual volume growth of Manglietia yuyuanansis grown in 17-year-old mixed stand (Cunninghamia lanceolata× Manglietia yuyuanensis) was conducted. The results showed that the correlation coefficients betwwen individual volume index (D^2H) and crown factors were different. Except single leaf area index (LAI) and crown layer density(CLD), the total leaf area of single tree (TLA),the tree crown area (TCA) and crown shape rate (CSR) were positively correlated to the individual volume index. The path analysis showed that TCA had the most direct effect on individual volume growth(P_(yx_i)=1.201 3), which was the key factor affecting the individual volume growth of M.yuyuanensis, while TLA, CLD, CSR played their roles through TCA. The importance of the five crown factors above-mentioned on the individual volume growth of M.Yuyuanensis was in the order of TCA>LAI>YLA>CSR>CLD. It was found during analyzing the influence of crown spatial structure on individual volume growth that in vertical direction, the leaf area in middle and lower layers played decisive role to individual volume growth and the upper layer played less role:while in horizontal direction, the leaf area in the inner and outer parts contributed more to the individual volume growth and that in the middle part contributed less.
出处
《林业科学研究》
CSCD
北大核心
2005年第3期310-314,共5页
Forest Research
基金
福建省211重点学科森林培育资助
福建省科委重点科研项目"阔叶树种选育"资助项目(99 Z 173)
关键词
乳源木莲
杉木
混交林
冠层特性
生长
通径分析
Manglietia yuyuanensis
Cunninghamia lanceolata
mixed stand
crown characteristics
growth
path analysis
