鄂西木林子种子植物区系与邻近区系的比较研究

木林子地处武陵山脉东北端,自然地理条件优越,种子植物种系饱和度大。在2100公顷的面积内有种子植物134科~1 488属、1043种(包括亚种和变种)。本文选取11个较有代表性地区的自然种子植物区系与木林子区系进行比较分析,以求深化对木林子种子植物区系性质、起源及与邻近区系关系的认识。多区系比较研究中,优势科的确立和其相似性指标是一个指示区系特征异同的重要参数,木林子种子植物区系优势科与湖北神农架、江西庐山、广东黑石顶和海南尖峰岭区系的相似性指标分别为73.3%、46.7%、33.3%和13.3%,共有优势科下辖的各种系在各区系中具明显的替代现象。在各区系种子植物属的比较中,沿用经典的分布区类型的划分和相似性指标的比较分析,并运用数量分类方法,以11个不同种子植物区系的14个分布区类型进行聚类分析,将11个种子植物区系分为3组。实践证明数量分类方法可客观地反映各区系间的异同,以及起源上的内在同一性。

COMPARATIVE STUDY BETWEEN SPERMATOPHYTE FLORA OF MULINZI NATURE SANCTUARY IN W.HUBEI AND ITS NEIGHBOUR FLORA

Mulinzi nature sanctrary is located in the northeast portion of Mt. Wulingshan. Its natural geographic elements are superior. The saturation point of species is higher A total of 1043 species(including subspecies and varieties, the same below) is collected in the small area (2100 hectares) representing 488 genera and 134 families. Understanded deeply the quality, origin, relationship with neighbour flora of Mulinzi flora, the natural spermatophyte flora of 11 representative areas chosen in this paper are compared with Mulinzi flora. In comparative studies of a lot of flora, determining the dominant families and calculating the similarity index are the important parameter of indicating similarities and differences of flora. The similarity ind dexes of dominant families of spermatophyte flora of Mt. Mulinzi in compare with Mt Shenlongjia of Hubei Province, Mt. Lushan of Jiangxi Province, Mt. Heishiding of Guangdong Province and Mr. Jianfengling of Hainan Province are separately 73.3%, 46.7%, 33.3%, and 13.3%. The common dominant families having a lot of species under their command possess obvious substitute phenomenon in each flora. The genera of each spermatophyte flora are compared and analysed by the classical classification of types of distributional areas and similarity index. In addition, 14 types of distributional areas of 11 spermatophyte flora carry on agglomerative classification. The results are resemble to the results of classical flora study. It is fully proved that the methods of quantitative classification can objectively reflect the similarities and flora with other flora and their identity of origin.