PDF《基于粗糙集的林木冠层结构和光分布对净光合 速率影响研究》

Vol.

34 No.

4 Apr.

2014 第34 卷第4期2014 年4月中南林业科技大学学报Journal of Central South University of Forestry &

Technology 收稿日期:2013-11-22 基金项目:国家林业公益性行业专项 城市地带性乡土植物材料筛选与体系构建模式研究 (201004042) 作者简介:钟泳林(1989-),男,硕士,主要研究森林培育理论与技术,E-mail:[email protected] 通讯作者:陈红跃,男,博士,教授, E-mail:[email protected] 基于粗糙集的林木冠层结构和光分布对净光合 速率影响研究 钟泳林

1 , 王志云

2 , 冼丽铧

1 , 鲍海泳

1 , 杨宝仪

1 , 孙同高

1 , 陈红跃

1 (1. 华南农业大学 林学院,广东 广州 510642;

2. 佛山市林业科学研究所,广东 佛山

528222 ) 摘要:以广东省东莞市大岭山森林公园

33 个乡土树种为研究对象,使用半球面影像技术和 Li-6400 光合仪分 别获取林木冠层结构、光分布和光合作用指标,用方差分析和粗糙集理论进行评价.结果表明,林冠开度、叶 面积指数、林下直射光、林下散射光、透光率和净光合速率均在各树种间存在极显著差异(p <

0.0001),各 指标在树种间的变化幅度也各不相同,其中林冠开度、林下直射光、林下散射光和透光率的变化幅度均超过了 20%,分别为 29.95%、20.40%、23.77% 和22.56%,而叶面积指数和净光合速率的变化幅度分别为 3.24 和7.80. 林冠结构和光分布均对林木净光合速率有重要贡献,但其影响程度不同.其中林冠开度最大,重要值为 1/11, 其余几项指标对光合作用的重要性相同,为2/33,略小于林冠开度的重要性.在评价林木冠层结构和光分布对 净光合速率的综合影响力中,林冠开度贡献的权重最大,为0.27,林下直射光、林下散射光和透光率贡献的权 重均为 0.18.冠层结构和光分布对林木净光合速率的综合影响力在一定程度可指示冠层结构和光分布的合理性, 与林木净光合速率大小不存在线性正相关关系,它只表明冠层结构和光分布对林木净光合速率的影响程度. 关键词:林木冠层结构;

光分布;

光合作用;

粗糙集 中图分类号:S718.43 文献标志码:A 文章编号:1673-923X(2014)04-0043-06 Effects of canopy structure and solar radiation distribution on net photosynthetic rate based on rough set theory ZHONG Yong-lin1 , WANG Zhi-yun1 , XIAN Li-hua1 , BAO Hai-yong1 , YANG Bao-yi1 , SUN Tong-gao1 , CHEN Hong-yue1 (1. College of Forestry, South China Agricultural University, Guangzhou 510642, Guangdong, China;

2. Foshan Institute of Forestry Science, Foshan 528222, Guangdong, China) Abstract: By taking the

33 native trees species in Dalingshan Forest Park in Dongguan city of Guangdong province as the studied objects, using hemispherical photography technology and Li-6400 portable photosynthesis system, the tested tree species'

canopy structure, solar radiation distribution and photosynthesis indexes were investigated and measured, and then the observed results were evaluated with variance analysis and rough set theory. The results indicate that there were very significant differences of canopy openness, leaf area index, transmitted direct solar radiation, transmitted diffuse solar radiation, transmitted total solar radiation and net photosynthetic rate respectively among tree species (p <

0.0001), and the amplitude of inter-speci?c variations of all these

6 indexes were not the same. The amplitude variations of canopy openness, transmitted direct solar radiation, transmitted diffuse solar radiation and transmitted total solar radiation were all more than 20.000% being such as: 29.95%, 20.40%, 23.77%, 22.56%, respectively, while those of leaf area index and net photosynthetic rate were 3.24 and 7.80, respectively;