河北省侧蒴藓类植物区系的主成分分析

根据较系统全面地野外调查、标本鉴定和整理，采用植物区系谱的主成分分析方法，对河北省侧蒴藓类植物区系进行了研究。结果表明；河北省侧蒴藓类植物共计196种(包括种以下单位)，隶属于17科，66属。其中，北温带地理分布类型占主导地位，共计98种，占总种数的50．79％；东亚地理分布类型54种，占总种数的27．77％；中国特有分布类型16种，占总种数的8．38％；东亚—北美分布类型9种，占总种数的4．71％；旧世界温带分布类型9种，占总种数的4．71％；热带分布类型(包括泛热带分布类型和热带亚洲分布类型)仅有3种，占总种数的1．57％。运用植物区系谱的主成分分析对河北省与我国相邻地区侧蒴藓类植物关系的研究表明：西藏和横断山为一组，相异系数分别为31．9和43．5，与河北的联系相差最远；河北—东北—秦岭—内蒙古—山东为一组，内蒙古和山东在地理位置上与河北接壤，但相异系数分别达21．0和15．6，而河北与东北、秦岭相异系数分别为6．4和12．0，它们在区系关系上更为接近。分析结果对吴鹏程(1998)关于中国苔藓植物分布路线的观点以有力的支持，即存在喜马拉雅南麓地区—秦岭—东北的苔藓植物迁移路线；同时，说明大的山脉是苔藓植物进行扩散和传播的重要通道。

Principal components analysis of pleurocarpous mosses flora in Hebei Province

Based on the study of investigation, collection and identification of pleurocarpous mosses in Hebei Province, the bryoflora in this area are studied by utilizing statistic analysis of floristic spectrum (FSA) and principal components analysis (PCA). The results show that 17 families, 66 genera and 196 species (including subspecies and varieties) have been discovered. The pleurocarpous mossflora in Hebei is subordinate to 9 geographical elements. North temperate elements take the leading position, including 98 species, approximating to one half of all species in Hebei. Contrast to the North temperate elements, the tropical elements is rare. The secondly important East Asian elements have 54 species, accounting for (27.77)%; among them, the main part is the Sino-Japan elements. Asian and North American elements, adding North temperate elements are 106 species, holding 55.50% of total species. Old World temperature elements are also 106 species, holding 55.50% of total species. Utilizing FSA and PCA, Xizang and Hengduan Mts. belong to one group; Hebei, the Northeast, Qinling Mts. and Shandong are another group. Among the later group, Hebei and the Northeast, Qinling Mts. are closer, and also Hebei is located between the Northeast and Qinling Mts.. In line with these analyses, the author agrees with Professor P C Wu's view (1998) that a bryophyte immigration route of Himalaya-Qinling Mts.-the Northeast exists. Moreover, the author holds that the mountains are the passageway of spread and distribution of bryophytes, while the plains are the barriers. To this point adverse to seed plant.