广东五桂山四药门花种群生态学研究  

Ecological Study of the Population of Loropetalum subcordatum on Wuguishan,Guangdong Province

作　　者：陈真权[1] 庄雪影[1] 黄久香[1] 高中旺[1] 郑明轩[1] 林清新 

机构地区：[1]华南农业大学林学院,广州510642 [2]中山市五桂山林场

出　　处：《广东林业科技》2009年第5期41-45,共5页Forestry Science and Technology of Guangdong Province

基　　金：中山市科技局和香港嘉道理农场暨植物园研究基金资助

摘　　要：四药门花（Loropetalum subcordatum）是我国特有的稀有植物,仅零星分布在香港、广东和广西。中山五桂山是四药门花自然种群的主要栖息地之一。在五桂山四药门花种群所在的次生林群落中设置样方,调查样方内树种名称及其胸径和树高;采取相邻格子法,记录样方内所有四药门花植株及其大小。调查结果表明四药门花所在的次生林群落以降真香（Acronychia pedunculata）、四药门花和铁榄（Sinosideroxylonwightianum）等树种为优势。在400 m2的样方中,乔木层树种丰富度指数为2.10～4.08,灌木层为5.81～8.37;乔木层Shannon-W iener多样性指数为1.42～2.51,灌木层为2.78～3.89;乔木层树种均匀度指数为0.59～0.84,灌木层为0.81～0.92。种群调查结果表明四药门花种群小,以Ⅲ级小树（2.5 cm≤dbh≤7.5cm）为优势,缺乏幼苗和幼树,自然更新不良;四药门花花期长,但自然种群的结实率低。继续开展四药门花自然种群的传粉生物学、遗传多样性和种苗扩繁技术研究有利于该稀有物种资源的保护和利用。Loropetalum subcordatum is a rare species,endemic to China. It is only confined to Hong Kong, Guangdong, and Guangxi. Wuguishan, Zhongshan city of Guangdong province is one of the major locations for L. subeordatum. In the secondary forest community with the population of L. subcordatum of Wuguishan, five plots with the area of 400 m^2 were set up. In each plot, the name and the trees with the diameter at the breast height （dbh） greater than 2.5 cm were measured and recorded. The size and number of all the individuals of L. subeordatum were recorded with contiguous grid quadrate method. The results showed that the forest community was dominated by Acronychia pedunculata and Sinosideroxylon wightianum, as well as L. subeordatum. In each plot of 400 m^2, The species richness of tree layer varied between 2.10 and 4.08, Shrub layer between 5.81 and 8.37 ;The species diversity （Shannon-Wiener index） of tree layer were between 1.42 and 2.51, Shrub layer between 2.78 and 3.89 ;The species evenness of tree layer were between 0.59 and 0.84, Shrub layer between 0.81 and 0.92. The result revealed that the natural population of L. subcordatum of Wuguishan was small and dominated by the small individuals with muhitrunks. There were only very few seedlings and saplings. The blooming period was long, but the set fruit rate was low. It is urgently required for the conservation and utilization of this rare species by further studying its pollination ecology, genetic diversity, and propagation techniques.

关 键 词：四药门花 种群 五桂山 

分 类 号：S718.54[农业科学—林学]