天宝岩柳杉群落主要乔木种群的种间联结性

Interspecific associations of the main tree populations of the Cryptomeria fortunei community in Tianbaoyan

为探寻天宝岩自然保护区天然柳杉群落主要乔木种群的种间联结性,揭示柳杉群落的种间关系以及演替趋势,以天宝岩柳杉群落重要值排前15位的主要乔木种群为研究对象,运用方差比率法(R_(V))、χ^(2)检验、联结系数(C_(A))、共同出现百分率(P_(C))和点相关系数(C_(PC)),对其进行种间联结性分析测定与生态种组划分。结果表明:天宝岩柳杉群落15个主要乔木种群总体呈不显著负联结,种间联结相对松散,独立性较强。χ^(2)检验结果显示,105个种对中,呈正联结的种对有46对,负联结种对有59对,正负联结比为0.78,其中不显著联结种对有75对,占总数的71.4%。C_(A)、P_(C)和C_(PC)结果均表明各种群之间多呈不显著联结,有较大的随机性,对生境需求不一致,种对共同出现概率较低。根据种群聚类分析结果和种间联结性分析及生态习性,把柳杉群落15个主要种群划分为3个生态种组,同一组内树种具有相似的生态习性和资源需求,种对间相互依赖共存,多呈正联结,不同生态种组间树种多呈负联结。因此,在对柳杉天然林保护的同时应选取与其呈正相关性的物种作为柳杉天然群落更新的主要物种,增加群落多样性,同时降低人为干扰,促进群落趋于稳定。

We aimed to explore the interspecific association of the main tree populations of a natural Cryptomeria fortunei community in the Tianbaoyan Nature Reserve,and reveal the interspecific relationship and succession trend of the Cryptomeria fortunei community.The main tree populations with the top 15 important values of a Cryptomeria fortunei community were selected as the research object.The variance ratio(R_(V)),χ^(2) test,association coefficient(C_(A)),percentage co-occurrence(P_(C)),and point correlation coefficient(C_(PC))were used to analyze and determine the interspecific associations,and classify the ecological species groups.The results showed that there were no significant negative associations among the 15 main tree populations of the Cryptomeria fortunei community in the Tianbaoyan Nature Reserve,the interspecific associations were low,and all groups tended to distribute independently.Theχ^(2) test results showed that among the 105 species pairs,46 were positively associated and 59 were negatively associated,with a positive/negative association ratio of 0.78;and 75 were not significantly associated,accounting for 71.4%.The results of C_(A),P_(C),and C_(PC) all show that the various groups are mostly insignificantly associated,with greater randomness,inconsistent habitat requirements,and a low probability of co-occurrence of species.Based on the results of species cluster analysis,interspecific association analysis,and ecological habits,the 15 main populations of the Cryptomeria fortunei community were divided into three ecological species groups.Species within the same group had similar ecological habits and resource needs,and the species pairs were interdependent and coexisted with mostly positive associations,while the species in different ecological groups were mostly negative associations.Therefore,to protect Cryptomeria fortunei natural forests,the species with positive correlations should be selected as the main species for the renewal of the Cryptomeria fortunei natural community to increase community diversity,reduce human disturbance,and promote the stability of the community.