%0 Journal Article
%T Spatial patterns of different age-class individuals in Pinus tabulaeformis forest in Songshan Nature Reserve of Beijing, China<br>北京松山自然保护区天然油松林不同龄级立木的空间点格局
%A NIU Li-li
%A YU Xin-xiao
%A YUE Yong-jie
%A <br>牛丽丽
%A 余新晓
%A 岳永杰
%J 应用生态学报
%D 2008
%I 
%X By the method of point pattern analysis, this paper studied the spatial patterns of different age-class individuals in the Pinus tabulaeformis forest in Songshan Nature Reserve of Beijing, and the spatial association between the individuals. The results showed that there existed greater differences in the densities of different age-class P. tabulaeformis individuals, e.g., age-class I had the density of 15 plants per hectare, while age-class III had the density of 924 plants per hectare. The spatial patterns of different age-class individuals and the spatial association between the individuals had a close relationship with the spatial scale. In the scale of < 40 m, the individuals of all age-classes tended to clump, and there was a stronger spatial association between the individuals of different age-classes. When the scale was larger than 30 m or 40 m, the individuals of all age-classes would disperse randomly, and their spatial association would be weakened greatly.
%K 种群格局
%K 点格局分析
%K 空间关联
%K 龄级
%K 北京
%K 松山自然保护区
%K 天然油松林
%K 龄级
%K 立木
%K 空间关联性
%K 点格局
%K Beijing
%K Nature
%K Reserve
%K forest
%K Pinus
%K tabulaeformis
%K different
%K patterns
%K 随机分布
%K 临界值
%K 空间尺度
%K 聚集分布
%K 小尺度
%K 相关
%K 级间
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=3EE099AEDF0F1BB513EFFE3903896D1C&yid=67289AFF6305E306&vid=2A8D03AD8076A2E3&iid=DF92D298D3FF1E6E&sid=8FB078CA6698CB38&eid=782B98DFA363AFCB&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=12&reference_num=22