关键词: 河北省北部, 苔藓植物区系, 地理分布

Abstract: Northern Hebei Province mentioned in the title refers to the vast area between Yanshan Mountains(including Yanshan Mountains) and Inner Mongolia Plateau, which lies approximately 40°35'~42°40'N and 113°27'~119°50'E. On the basis of the physiognomy causes of the formation, the different earth shapes and vegetation types, Northern Hebei Province is generally divided into four districts:North Plateau, Jixibei Basins, Jibei Mountains and Yanshan Mountains.This thesis is mostly based on about 2000 packages of bryophytes which were mainly collected by the author in Northern Hebei Province from July to August in 1998. Of all these specimens, 36 families, 104 genera and 270 species(including 4 varieties and 3 forms) have been studied and identified. Moreover, using Abundance Index, we can see that Northern Hebei Province is richer in diversity of mosses compared with other 9 mountains in China. The bryoflora in Northern Hebei Province can be divided into 11 geographical elements. North temperate elements make up the majority, approximating to 54.07% of the entirely known bryoflora in Northern Hebei Province, and next comes East Asian elements, accounting for 14.81%. All temperate elements, not including 17 Endemic to China and 16 Cosmopolitans, add up to 227 species, which take 84.08% of all the entirely known bryoflora in Northern Hebei Province. However, there are only 10 Sub-tropical and Tropical elements. To all appearances, the mossflora of Northern Hebei Province is provided with obvious temperate characters. Floristic Spectrum Analysis is a good method for the comparison of similarities between different floras. Principal Component Analysis(PCA) was used to quantitatively analyse the elements of bryoflora in Northern Hebei Province and 12 other mountains or areas in China so as to find out the relationship of the bryoflorain these places. The result shows that the bryoflora relationship of Northern Hebei Province, Xiaowutai Mountains and Inner Mongolia areas is very close, while Jiuwan Mountains is far from other 12 mountains.Using clustering analytic means, the Northern Hebei Province can be compartmentalized two zones, namely Zhangbei Plateau moss geographical zone and Jibei Mountains moss geographical zone, according to different geographical position and different ecologic circumstance of the 13 collecting locality in Northern Hebei Province. The level distributing chart of species percentage in the 13 collecting locality can intuitively show that the number of species drop off from east to west and increase gradually from northwest to southeast. In addition, the life-form of mosses in Northern Hebei Province can be plotted out two types:Acrocarpi-muscorum and Pleurocarpi- muscorum. Through their level distributing cake chart, it can be obviously seen that Acrocarpi-muscorum species absolutely predominate in Zhangbei Plateau and Jixibei Basins where the climate is cold and dry, while species pecentage of Pleurocarpi-muscorum increase evidently in Chengde Plateau, Jibei Mountains and Yanshan Mountains where the climate is relatively warm and wet. All these are consistent with the two moss geographical zones above-mentioned.

Key words: Northern Hebei Province, bryoflora, geographic distribution