川西亚高山红桦-岷江冷杉林优势种群的空间格局分析  

Spatial patterns of dominant tree species in sub-alpine Betula-Abies forest in West Sichuan of China

作　　者：缪宁[1] 刘世荣[1] 史作民[1] 喻泓[2] 刘兴良[3] 

机构地区：[1]中国林业科学研究院森林生态环境与保护研究所国家林业局森林生态环境重点实验室,北京100091 [2]中国林业科学研究院林业研究所,北京100091 [3]四川省林业科学研究院,成都610081

出　　处：《应用生态学报》2009年第6期1263-1270,共8页Chinese Journal of Applied Ecology

基　　金：国家“十一五”科技支撑计划项目(2006BAD03A0402,2006BAD03A100302,2006BAD03A1004);国家重点基础研究发展规划项目(G2002CB111504)资助

摘　　要：以红桦-岷江冷杉林4hm2样地调查数据为基础,采用点格局分析法O-ring函数,分析了红桦和岷江冷杉2个优势种群不同龄级的空间分布格局,以及各龄级间的种内和种间关联性.结果表明:红桦种群径级分布呈单峰型,为衰退种群;岷江冷杉种群径级分布呈倒"J"型,为进展种群.岷江冷杉与红桦大树在所有尺度上均为随机分布,其余龄级在小尺度上为聚集分布,随尺度增大趋于随机分布和均匀分布,最大聚集强度随龄级增大而减弱.空间关联主要发生在小尺度上.岷江冷杉种内关联以小尺度正关联为主,红桦种内关联以小尺度负关联为主.对于2个种群的相同龄级,小龄级、中龄级和大龄级间,分别以空间无关联、负关联和无关联为主.2个种群间不同龄级间以负关联为主,龄级相差越大,其负关联越强.Based on the investigation in a 4 hm^2 Betula -Abies forest plot in sub-alpine area in West Sichuan of China, and by using point pattern analysis method in terms of O-ring statistics, the spa-tial patterns of dominant species Betula albo-sinensis and Abies faxoniana in different age classes in study area were analyzed, and the intra- and inter-species associations between these age classes were studied. B. albo-sinensis had a unimodal distribution of its DBH frequency, indicating a declining population, while A. faxoniana had a reverse J-shaped pattern, showing an increasing popula-tion. All the big trees of B. albo-sinensis and A. faxoniana were spatially in random at all scales, while the medium age and small trees were spatially clumped at small scales and tended to be ran-domly or evenly distributed with increasing spatial scale. The maximum aggregation degree decreased with increasing age class. Spatial association mainly occurred at small scales. A. faxoniana generally showed positive intra-specific association, while B. albo-sinensis generally showed negative intra-specific association. For the two populations, big and small trees had no significant spatial association, but middle age trees had negative spatial association. Negative inter-specific associations of the two populations were commonly found in different age classes. The larger the difference of age class, the stronger the negative inter-specific association.

关 键 词：空间格局 空间关联 点格局分析 龄级 红桦-岷江冷杉林 亚高山 

分 类 号：S718.542[农业科学—林学]