摘要
选择关帝山典型天然次生杨桦林样地进行种群结构分析,并运用空间点格局分析方法O-ring统计系统分析了次生杨桦林群落内不同尺度下种群空间分布格局及种间关联性。结果表明,在个体组成上,演替先锋树种白桦(Betula platyphylla)、红桦(B.albo-sinensis)和山杨(Populus davidiana)是目前次生杨桦林样地的优势种。但从种群径级结构看,白桦、红桦和山杨天然更新不良,而云杉(Piceaspp.)和华北落叶松(Larix principis-ruppre-chtii)幼苗呈现良好的更新状态。随着演替的进行,云杉、落叶松将逐渐进入林冠层并取代白桦、红桦和山杨成为该森林的优势种;从种群空间分布格局来看,红桦、白桦表现为小尺度上明显聚集,华北落叶松、皂柳(Salix walli-chiana)表现为小尺度上强聚集性分布格局。种群空间分布格局受空间尺度、群落结构及种群径级结构综合作用的影响;空间关联性分析表明,红桦与华北落叶松、红桦与皂柳、皂柳与华北落叶松在小尺度上正相关,其它树种间没有表现出明显关联性。
A typical natural secondary poplar-birch forest in Guandi Mountain was selected as a plot.In this plot,population structure was analyzed,and all arbor species at least 1 cm diameter at breast height（DBH,1.3 m above ground） were mapped and identified to species,and their geographic coordinates were recorded following a standard field protocol.The pair correlation function,univariate O-ring statistic of the point pattern analysis,was used to analyze spatial distribution of tree species in the secondary poplar-birch forest,while bivariate O-ring statistic was used to analyze spatial associations of different species in this community.We found that：The statistics of species abundance showed that pioneer species Betula platyphylla,B.albo-sinensis and Populus davidiana are obviously dominant species in present stand.However,the regeneration of the three species is very poor by the analysis of size-class distributions.On the contrary,the regeneration of Picea meyeri,P.wilsonii and Larix principis-rupprechtii seedlings is fine,they will replace the pioneer species and dominate the over story layer with the succession of the community;Spatial distribution pattern analysis showed that B.albo-sinensis,B.platyphylla were obviously but L.principis-rupprechtii,Salix wallichiana were significantly clumped at small scales.Spatial patterns of species are affected by spatial size,community structure and tree age;Spatial associations analysis showed that there are positive associations between B.albo-sinensis and L.principis-rupprechtii,B.albo-sinensis and S.wallichiana,S.wallichiana and L.principis-rupprechtii at small scales,but there is no obvious association between other species.
出处
《西北植物学报》
CAS
CSCD
北大核心
2010年第9期1895-1901,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金资助项目(30972349)
高等学校博士学科点专项科研基金项目(20091403110005)
山西农业大学科技创新基金项目(2004055
2004057)
关键词
种群结构
空间分布格局
空间关联性
次生杨桦林
关帝山
population structure
spatial distribution pattern
spatial association
secondary poplar-birch forest
Guandi Mountain
