摘要
在北京雾灵山自然保护区天然次生林内,设置了2个有代表性的固定标准地,应用相邻格子法获得野外调查资料,进行优势种群结构和空间分布格局的研究。结果表明:(1)以山杨为优势种群的群落I和以蒙椴为优势种群的群落II年龄结构呈塔型,群落高度结构呈"L"型,幼苗相当丰富,天然更新能力强。(2)山杨种群、白桦种群、黑桦种群均为衰退种群,蒙椴种群表现为增长型种群。(3)在分布格局上,不同群落优势种群均呈集群分布,白桦伴生种群呈随机分布,黑桦种群在不同群落中分布格局差异较大。不同群落在整体上呈集群分布,但不同发育阶段,分布格局有所差异,幼树和中树阶段为集群分布,中树阶段显示出扩散的趋势,大树阶段为随机分布,这种差异与其生物学和生态学特性及物种的竞争有密切联系。
In order to study the structures and the spatial distribution patterns of the dominant populations of plant communities,two typical fixed standard fields were established in the natural secondary forest in Wuling mountain nature reserve,and the neighboring grid method was employed to obtain the field data.Results showed that：（1）for communityⅠwhich dominated by Populus davidiana and community Ⅱ which dominated by Tilia mongolica,the age structure of both presented the tower mode,the height structure demonstrated ＂L＂ mode,both communities presented considerable abundant in seedlings and strong ability in natural regeneration.（2） all the populations of Populus davidiana,Betula platyphylla and Betula davurica,presented the type of declining population but the Tilia mongolica displayed growing population type.（3） as to distribution pattern,all the dominant populations of different communities presented cluster modes.As a associated population,Betula platyphylla presented stochastic distribution mode,while Betula davurica presented biggish differences of distribution patterns in different communities.At the level of communities,different ones presented cluster mode of distribution in whole,but at different development stages,the ones presented distinct distribution patterns in that cluster distribution mode for saplings and middle-aged trees,tendency of diffusion for middle-aged trees,stochastic distribution mode for mature trees,and this distinction related to the biological,ecological characteristics of species and the competition among them closely.
出处
《水土保持学报》
CSCD
北大核心
2007年第6期192-196,共5页
Journal of Soil and Water Conservation
基金
国家"十一五"科技支撑计划项目(2006BAD03A0201)
北京市科委重大项目(D0706001000091)
关键词
雾灵山
天然次生林
种群结构
种群动态
分布格局
Wuling mountain
natural secondary forest
population structures
population dynamics
distribution patterns
