PDF《乌冈栎群落垂直结构与重要值分析》

收稿日期: 2010-07-05 基金项目: 林业公益性行业科研专项(201004094)资助.

作者简介: 谢春平,男,博士.E-mail:[email protected] * 通讯作者: 方炎明,男,教授,博士生导师.E-mail:[email protected] 安徽农业大学学报, 2011, 38(2): 176-184 Journal of Anhui Agricultural University [DOI]CNKI: 34-1162/S.20110303.0952.015 乌冈栎群落垂直结构与重要值分析 谢春平 1,2 ,方彦1,方炎明 2* (1. 南京森林警察学院侦查系,南京 210046;

2. 南京林业大学森林资源与环境学院,南京 210037) 摘要:群落垂直结构和物种重要值是群落的重要特征,是认识群落的基础,在一定程度上反映物种的动态及 群落的演替趋势.通过对不同地区乌冈栎群落的垂直结构与重要值的分析,结果如下: (1)乌冈栎群落垂直结构可 分为乔木层、灌木层、草本层和层间,但草本层与层间结构都十分简单;

群落垂直高度普遍较低,大致在 4~7 m, 群落郁闭度在 0.6~0.75,乔木层盖度在 80%左右,林层稀疏,并有林窗存在;

灌木层垂直结构各地情况不尽一致, 高度在 1~2 m,整体而言其物种组成及垂直高度结构复杂性要大于乔木层. (2)各物种重要值结果表明,乌冈栎 占有较高的重要值比例, 是乔木层的绝对优势树种, 其余重要值较大的物种大多属于亚热带山地森林常见树种如 木、青冈、刺柏、乌饭树、满山红等;

乔木层重要值比例较为集中在前

10 的树种,体现出群落优势种较为明显的 局面;

灌木层重要值比较分散,大多数灌木的重要值比例不高,这说明了该层物种多样性高的特点;

乌冈栎的幼树 幼苗在多数群落内均较少,导致其重要值较低,不利于乔木层的补充更新. 关键词:乌冈栎群落;

垂直结构;

重要值 中图分类号:S718.54 文献标识码:A 文章编号:1672?352X (2011)02?0176?09 Analysis of the vertical structure and importance value of Quercus phillyraeoides community in different districts XIE Chun-ping1,2 , FANG Yan1 , FANG Yan-ming1 (1. Investigation Department, Nanjing Forest Police College, Nanjing

210046 ;

2. College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037) Abstract: Community vertical structure and species importance values are essential characteristics to under- stand the community, which can reflect the dynamic of species and the succession tendency of communities. The results of this paper show as follows. (1) The vertical structure of Q. phillyraeoides community could be divided into tree layer, shrub layer, herb layer and interlayer, but the structures of herb layer and interlayer were very sim- ple;

the height of vertical structure was about 4-7 m, and the canopy of community and tree layer coverage were about 0.6-0.75 and 80%, respectively, which meant the community structure was sparse and gaps existed. It is not the same of the situation of shrub structure in different districts as that of the tree layer. The height of shrub layer was about 1-2 m, and the complexity of species composition and vertical structure were more than that of tree layer. (2)The importance value of individual species indicated that Q. phillyraeoides was dominant species with high value, while other species with less significance than Q. phillyraeoides were subtropical forestry common trees such as Loropetalum chinense, Cyclobalanopsis glauca, Juniperus formosana, Rhododendron mariesii. The importance value in the top

10 of each community occupied the great mass of percentage in the tree layer, which could represent the reality of the structure;