浙江普陀山岛森林木本植物的种间关联格局  

Patterns of species associations in woody plants in forest communities of Putuoshan Island, Zhejiang, China

作　　者：刘翔宇[1,2,3] 何东 田文斌 宋彦君 尹芳[1,2,3] 许洺山 程浚洋[1,2,3] 阎恩荣 

机构地区：[1]华东师范大学生态与环境科学学院,上海200241 [2]浙江普陀山森林生态系统定位观测研究站,浙江舟山316100 [3]上海市城市化生态过程与生态恢复重点实验室,上海200241 [4]普陀山公用事业管理中心,浙江舟山316100

出　　处：《植物生态学报》2017年第12期1219-1227,共9页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金(31670438);海洋公益性行业科研专项(201505009)

摘　　要：种间关联不仅反映种间的生态关系,而且能在一定程度上启示群落构建过程与机制。该研究以浙江普陀山森林群落中的93种木本植物为对象,基于二元数据的物种×样方矩阵检验了种对间的关联性。结果显示:在10 m×10 m和20 m×20m两种空间尺度下,普陀山森林群落物种的空间分布总体上有显著的协变关系,但是所观察到的4 278个物种对(93个物种的两两组合)中绝大部分不显著关联,这在一定程度上支持了物种独立性假说。常见种之间的关联强度大于稀有种之间的关联强度,表明物种多优度是种间关联特征的影响因子,同时表明随机因素对物种共存有一定的影响。种间关联随机性检验发现,反映实际群落种间关联特征的方差比率、显著比均落在随机群落(假定物种随机聚合)期望值的2.5%–97.5%阈限之外,证明生态位过程在普陀山森林物种共存格局中也起一定作用。总体而言,植物群落物种成分并不一定是特定物种的组合,物种间的不关联或负关联也并不一定是生态位分化的结果,物种多优度是影响物种空间关联的重要因素。Aims Interspecific associations can reflect how species are assembled into communities. The objectives of this study were to examine the patterns of woody species co-occurrence and to determine how species＇ abundance would affect species associations. Methods Data from a total of 23 plots were used to test the interspecific associations of 93 woody plant species in forest communities of Putuoshan Island in Zhejiang Province. We compared the observed species associations with the expected patterns at random, and correlated interspecific association intensities with co-dominance propensity of species pairs. Important findings Species distribution co-varied among plots at the spatial scale of either 10 m × 10 m or 20 m × 20 m, but the majority of the 4 278 species pairs were not significantly associated. Interspecific association intensities were positively correlated with co-dominance propensity of species pairs, indicating that species abundance is a key factor affecting the interspecific co-occurrence. The observed values of variance ratio and the proportion of significantly associated species pairs consistently fell outside of the 2.5 th–97.5 th percentiles of random expectations（i.e. randomly permuting species across plots）, suggesting that deterministic processes also play a role in species associations on the Putuoshan Island. We conclude that the pattern of woody species co-occurrence on Putuoshan Island are structured by both niche and stochastic processes.

关 键 词：种间关联强度 海岛 多优度 随机因素 生态位过程 

分 类 号：Q948[生物学—植物学]