杭州湾北岸沿海防护林冠层结构及林下光环境  

Understory light environment and canopy structure of six coastal protection forests on the north coast of Hangzhou Bay

作　　者：成向荣[1] 冯利 虞木奎[1] 刘志龙[1] 张翠[1] 王宗星[1] 葛乐[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400 [2]河北省兴隆县发展改革局,河北兴隆067300

出　　处：《浙江林学院学报》2010年第6期872-876,共5页Journal of Zhejiang Forestry College

基　　金："十一五"国家科技支撑计划项目(2009BADBZB03)

摘　　要：利用跟踪辐射与冠层结构测量仪(TRAC)研究了杭州湾北岸6种沿海防护林冠层结构及林下光环境特征。结果表明:6种林分以中山杉Taxodium ascendens×mucronatum间隙分数最大,红叶椿Ailanthus altissima'Hongye',洋白蜡Fraxinus pennsylvanica和美国皂荚Gleditsia triacanthos的平均间隙分数接近,乌桕Sapium sebiferum和女贞Ligustrumlucidum的平均间隙分数相对较小。而各林分叶面积指数特征与间隙分数相反,女贞和乌桕平均叶面积指数(LAI)较高,红叶椿、洋白蜡、美国皂荚和中山杉的叶面积指数接近。红叶椿叶丛生效应较低,而美国皂荚、乌桕、中山杉、洋白蜡和女贞具有类似的丛生效应。各林分内光量子通量密度(PPFD)具有较大差异,其大小依次为中山杉>美国皂荚>红叶椿,洋白蜡>乌桕>女贞。The canopy structure and environmental characteristics from understory light for six coastal protection forest stands （Taxodium ascendens × mucronatum,Ailanthus altissima ＇Hongye＇,Fraxinus pennsylvanica,Gleditsia triacanthos,Sapium sebiferum,and Ligustrum lucidum） on the north coast of Hangzhou Bay were measured by Tracing Radiation and Canopy Architecture （TRAC）.Results showed that the canopy gap fraction of the T.ascendens × mucronatum stand was greater than the other five stands which had no major difference between them.The stand leaf area index （LAI） was opposite of the gap fraction with the average LAI of S.sebiferum and L.lucidum significantly （P0.05）higher than the other stands with the other four stands being about the same.Leaf clumping was significantly （P0.05）lower for the A.altissima ＇Hongye＇ stand with the other five stands about the same.Understory photosynthetic photon flux density （PPFD） for the six stands had significantly （P0.05） differences with the order of light intensity as：T.ascendens ×mucronatum G.triacanthos A.altissima ＇Hongye＇,F.pennsylvanica S.sebiferum L.lucidum.

关 键 词：森林生态学 沿海防护林 冠层结构 光环境 

分 类 号：S718.45[农业科学—林学]