摘要
在 2× 2联列表基础上 ,应用 χ2检验、联结系数 (Ac)和 Dice系数 (DI)检测七姊妹山珙桐群落的种间联结性。结果表明 :珙桐群落中种间联结的显著程度非常低 ,仅有 4种对联结性显著 ,且均为正联结。大多数种对间的关联度很低 ,存在极大排斥性的种对很少。珙桐和灰柯、泡花树、木、交让木表现出极大的正关联性 ;珙桐与绢毛稠李之间存在极大负关联。重要值排在前三位的珙桐、紫楠、尾叶山茶互相之间的关联度较小。尾叶山茶和 10种植物之间存在极大的正关联性 ,这说明了尾叶山茶在群落中的稳定地位及其重要性。灰柯与珙桐、紫楠、尾叶山茶都存在极大的正关联性 ,这暗示着灰柯可能是群落的关键种。最后对种间联结方法的应用提出了一些建议。
Based upon a 2×2 contingency table,a series of techniques including χ2 test,association coefficient and Dice index were used to determine the interspecific association in Davidia involurata Community of Mt.Seven-sister.The results were expressed in the forms of semi-matrix and constellation figures,and indicated that the interspecific association was of little significant level,only four pairs of species exhibited significantly positive association.There was a low association degree between most pairs of species;meanwhile few pairs of species were extremely exclusive to each other.Involurata were extremely positively associated with Lithocarpus henryi,Meliosma cuneifolia,Aralia chinensis and Daphniphyllum macropodum,but extremly negatively associated with Padus wilsonii.Davidia involurata,Phoebe sheareri,Camellia caudata,whose importance values ranked first,were slightly associated with each other,and they occupied their own niches respectively,competing slightly for environmental resources.The fact that C.caudata were extremely positively associated with ten species showed its stable place in community and its important role in maintaining the stable structure of Davidia involurata Community.Henryi perhaps was a keystone species,because it was extremely positively associated with the three plants,whose importance values ranked first.Finally,it was proposed how to apply interspecific association more efficiently.
出处
《武汉植物学研究》
CSCD
2003年第3期203-208,共6页
Journal of Wuhan Botanical Research
基金
湖北省野生动植物保护总站资助项目
关键词
珙桐
种间联结
湖北宣恩
七姊妹山
联结系数
Dice系数
Davidia involurata Baill.
Interspecific association
Mt.Seven-sister
Association coefficient
Dice index
