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河北省侧蒴藓类植物的地理成分及其与邻近地区的比较

Comparison between the Pleurocarpous Mosses-flora of Hebei and Its Nearby Regions

  • 摘要: 通过对河北省侧蒴藓类植物较详尽的野外考察、标本采集、鉴定和系统研究,已知河北省侧蒴藓类植物17科,66属,196种(包括种下单位),其地理成分可划分为9种类型,北温带分布型占主导地位,东亚分布型次之,热带分布型不起主要作用。运用物种丰富度、优势科比较、属相似性系数等统计方法,对河北与邻近地区的区系地理成分进行了比较、分析和讨论。从河北省与我国东北、内蒙古、山东、秦岭、西藏和横断山等6个地区侧蒴藓类区系组成的比较分析得出,本省该类群物种丰富度位居第4,横断山居于第1位;河北与其它6个地区的共有优势科前3位为青藓科、柳叶藓科、灰藓科;河北与内蒙古、山东相似程度最高,与东北和秦岭相似程度次之,与西藏、横断山相差最大。同时对这7个地区的具体地理成分也作了比较。这些结果有力地说明了河北省侧蒴藓类植物区系具有明显的温带性质,同时兼有浓厚的东亚区系色彩;也表明了中国华北与日本、欧洲和北美东北部在苔藓植物区系物种起源上有深厚的历史渊源。

     

    Abstract: From 1995, a study of our Bryofloristic collections from Hebei Province has been developed. Up to now, there are 17 families, 66 genera and 196 species (including subspecies and varieties) pleurocarpous mosses have been distinguished. The pleurocarpous moss-flora in Hebei is subordinate to 9 areal types. North Temperate areal type takes the leading position, including 97 species, approximating to one half of all species in Hebei. Contrast to the North Temperate areal type, the tropical areal type is rare. The secondly important East Asian areal type has 54 species, accounting for 27.77%; among them, the main part is the Sino-Japan areal subtype. Old World Temperate and North Temperate areal types are 106 species, holding 55.50% of total. There are 81 common species pleurocarpous moss between Hebei Province and Eastern North America, (ta-)(king) 42.41% of all. To all appearances, the pleurocarpous moss-flora of Hebei is provided with evident temperate nature and East Asiatic element. We are concentrated on making a comparison between the pleurocarpous moss-flora of Hebei and those of neighboring regions, which are Northeast of China, Inner Mongolia, Shandong, Mountains Qinling, Tibet,Mountains (Heng-)(duan,)by utilizing abundance index (AI),similarity coefficient of genus (SCG),comparison of the dominant families and floristic spectrum analysis (FSA). The results show that the AI of this category in Hebei is the forth and the rate of endemic species to China is high; similarity efficient between Hebei and Inner Mongolia is the biggest; Brachytheciaceae, Amblystegiaceae and Hypnaceae are dominant families ahead between Hebei and other six regions; tropical and subtropical elements reduce towards the North China, and temperate ones increase. All these demonstrate the complexion of moss-flora and the ancient character of origin of bryophytes in Hebei.Besides the intimate relationships of the moss-flora between China and Japan, Europe as well as Eastern North America have been full showed.

     

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