黔中喀斯特地区马尾松群落主要物种种间联结、生态位及群落稳定性特征  

Interspecific associations,niches and community stability of main species in Pinus massoniana community in karst mountainous cities,the central Guizhou Province

作　　者：雷德芳 王志杰[1] LEI Defang;WANG Zhijie(College of Life Sciences,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学生命科学学院,贵阳550025

出　　处：《生态学报》2024年第10期4353-4367,共15页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(42061039);贵州大学培育项目(贵大培育[2020]46)。

摘　　要：研究群落内主要物种的种间联结、生态位宽度与重叠及群落稳定性,能够了解群落结构及优势物种的资源利用习性,对森林经营管理和植被恢复与重建具有重要的意义。基于黔中喀斯特山地贵阳市乌当区2021年7月的马尾松群落调查数据,采用方差比率法(VR)、χ~2检验、Spearman秩相关检验、Levins生态位宽度指数、Pianka生态位重叠指数和M.Godron稳定性等方法,对该群落主要物种的种间联结、生态位及群落稳定性进行分析。结果表明:该群落乔木层、灌木层和草本层主要物种间的总体关联性均呈不显著正关联,66.67%—80.95%的种对均无显著关联,种间关联较松散且相关性较弱,各物种间呈独立分布格局;马尾松的重要值和生态位宽度最大(为20.78),与伴生物种间均存在生态位重叠;群落整体及各垂直层次的稳定性均远离20/80,处于不稳定状态。因此,在喀斯特山地生态恢复和保护工作中,应优先选择生态习性和生物学特性相近的物种,合理调整植被组成以维持种间平衡,提高群落稳定性。Studying the interspecific associations,niche width and overlap,and community stability of main species of plant community will help to understand the community structure and ecological habits of dominant species on resource utilization,which is of great significance to forest management and vegetation restoration and reconstruction.Utilizing July 2021 survey data in the karst region of Wudang District,Guiyang,the interspecific associations,niche width and overlap and community stability of main species in the Pinus massoniana community were studied by various methods including variance ratio(VR),Chi-square test(χ~2 test),Spearman′s rank correlation coefficient test,Levins′s niche width index,Pianka niche overlap index,and M.Godron stability analysis.The overall associations among the main species in the tree,shrub and herb layers of Pinus massoniana community were insignificantly positive.The Chi-square test showed that most of the species′ pairs(66.67%—80.95%) in each vertical layer were insignificantly associated,reflecting weak interspecific associations and independent distribution patterns among the species.Spearman′s rank correlation test indicated that most species′ pairs in each vertical layer were not significantly correlated,and the correlation between species was weak.Pinus massoniana exhibited the highest important value and niche width(20.78),and had niche overlap with all other species.There was no significant correlation between niche width and important value,and species with larger niche width had a higher probability of generating niche overlap with other species,while there was also a high level of niche overlap between species with smaller niche width.M.Godron stability analysis indicated that the ratios of cumulative inverse of species number to the cumulated relative frequency ratios of species in the tree layer,shrub layer,herb layer,and the whole community were 30.16/69.84,46.84/53.16,45.27/54.73,and 46.91/53.09,respectively,which were all far from 20/80,indicating that both

关 键 词：马尾松群落 种间联结 生态位 群落稳定性 喀斯特山地城市 

分 类 号：Q94[生物学—植物学]