摘要
以海南中部山区不同演替阶段的两种天然次生林为研究对象,将林分空间结构关系的大小比数引入优势度评价,并用层次分析法在多个指标上对优势度进行了综合评判。结果表明:树种在不同指标测度下的优势程度不尽相同,相比于传统意义上的优势度测定方法,空间指标和数量指标的结合对于表达不同树种的优势度更具有科学性和合理性。处于早期竞争生长阶段的天然次生林树种优势度的大小在综合指标上和传统生态学上的差异不明显,但随着演替的发展,中、近熟龄的天然次生林中树种的优势度在空间上的分化开始出现,并且这种分化现象会随着演替的发展变得更加明显。这种用综合指标来确定优势树种的方法对于树种种类繁多的热带次生林经营,特别是以目标树为经营对象的近自然经营,起到了指示性的作用。此外,树种优势度在综合指标和数量指标上出现的分化现象可以作为次生林演替发展中是否进入林木质量选择阶段的一个参考指标。
Neighborhood comparison was applied to dominance evaluation, and an integrated evaluation of species dominance was made in terms of multiple indexes by analytic hierarchy process using natural secondary forests at different succession stages in the Central Mountain Areas in Hainan Island as the research object. Results indicate that the species dominance values evaluated by different indexes are different. Compared with the traditional evaluation methods of species dominance, it is more scientific and rational to use both spatial index and quantitative index to express the dominance of different tree species. The dominance values of different tree species in the natural secondary forests in the early competitive period have httle difference in comprehensive index and ecological index, but with the development of succession, the differences in dominance values of tree species in middle-aged and mature natural secondary forests are more obvious. The multi-index evaluation method of species dominance could play an indicative role in the management of tropical secondary forests, especially in the management of close to nature forests. In addition, the differentiation phenomenon of species dominance in comprehensive index and quantitative index could be used as a reference to judge whether the secondary forest is at quality selection stage or not.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2009年第7期39-41,共3页
Journal of Northeast Forestry University
基金
国家自然科学基金课题((30671679)
国家"十一五"科技支撑计划(2006BAD03A04-03)资助
关键词
优势度
大小比数
重要值
层次分析法
树种组成
Dominance
Neighborhood comparison
Importance values
Analytic hierarchy process
Tree species composition
