%0 Journal Article
%T Spatial pattern analysis of a Rhododendron-Abies virginal forest near timberline on the eastern edge of Qinghai-Tibetan Plateau, China<br>青藏高原东缘林线杜鹃-岷江冷杉原始林的空间格局
%A MIAO Ning
%A LIU Shirong
%A SHI Zuomin
%A XUE Zebing
%A YU Hong
%A HE Fei
%A <br>缪宁
%A 刘世荣
%A 史作民
%A 薛泽冰
%A 喻泓
%A 何飞
%J 生态学报
%D 2011
%I 
%X Although biological characteristics of different populations in timberline area are widely studied, the spatial relationships of main tree species are still poorly understood due to a lack of studies. In order to improve the understanding on the spatial structure and relationships of rhododendron species and canopy trees in virginal forests near timberline with less anthropogenic influence, we studied the role of spatial patterns and associations of Abies faxoniana and Rhododendron agglutinatum on the eastern edge of Qinghai-Tibetan plateau, China. Based on the investigation in a 1 hm2 Rhododendron-Abies virginal forest plot near timberline on the eastern edge of Qinghai-Tibetan plateau, China, the pair correlation function g(r) was used to analyze the spatial patterns of two dominant species, A. faxoniana and R. agglutinatum, with different size classes and the spatial associations of intra- and inter-species between different size classes. Both species showed continual distribution of DBH size classes and a reverse J-shaped pattern, suggesting an increasing population. For A. faxoniana, alive trees (small + middle + big), small trees and middle trees showed significantly aggregated distribution, and big trees showed regular distribution, while dead trees showed random distribution at small scales. For R. agglutinatum, alive trees (small + middle + big), small trees, middle trees, big trees and dead trees all showed significantly aggregated distribution at small scales. A. faxoniana tended to be from aggregated distribution to regular distribution with increasing size classes at small scales. A. faxoniana big trees showed significant repulsion pattern with its small trees at 0 6 m, while showed significant attraction pattern at 8 13 m, and showed independent pattern at other scales, and those patterns validated the distance dependence effects of Janzen-Connell hypothesis. Random mortality hypothesis was accepted through random labeling test, and there was no clear evidence of density dependence effect of both intra-species. Standing dead trees of both species showed repulsion pattern with small trees of R. agglutinatum at small scales, suggesting that it was not favorable for the settlement of small trees of R. agglutinatum around standing dead trees, while standing dead trees showed independence pattern with small trees of A. faxoniana at small scales. There was no significant spatial association between trees alive of the two species, while different classifications of size classes of the two species showed different spatial associations. Particularly, A. faxoniana big trees showed repulsion pattern with small and middle trees of R. agglutinatum at small scales. A. faxoniana big trees showed significant repulsion pattern with big trees of R. agglutinatum at 0 4 m, while showed attraction significant pattern at 4 11 m, suggesting that there were spatial segregation between those two species. Intra-specific spatial associations were highly posit
%K spatial distribution pattern
%K spatial association
%K pair correlation function g
%K alpine timberline
%K species relationships
%K Abies faxoniana
%K Rhododendron agglutinatum<br>空间分布格局
%K 空间关联
%K 成对相关函数g
%K 高山林线
%K 种间关系
%K 岷江冷杉
%K 凝毛杜鹃
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=843448F3B43780A2CD6ED196B5B50BD8&yid=9377ED8094509821&vid=4AD960B5AD2D111A&iid=CA4FD0336C81A37A&sid=CA4FD0336C81A37A&eid=9CF7A0430CBB2DFD&journal_id=1000-0933&journal_name=生态学报&referenced_num=0&reference_num=39