河南鸡公山木本植物区系的研究

鸡公山国家级自然保护区是我国北亚热带森林生态系统自然保护区之一,地处亚热带与暖温带的过渡地带,是华中、华东和华北三大植物区系的交汇区之一,木本植物种类比较丰富。据初步统计,该区有木本植物71科、181属、543种,其中裸子植物5科、5属、7种。该区木本植物区系具有下列基本特点:1)区系成分比较丰富;2)古老和孑遗成分繁多;3)区系成分过渡性明显。该区木本植物可分为14种地理成分(分布区类型),其中热带属占35.0%,温带和亚热带分布的属占65.0%。

STUDIES ON THE WOODY PLANTS FLORA OF JIGONG MOUNTAIN IN HENAN

Jigong Mountain Natural Reserve in Henan Province is situated in the area where the boundaries of two provinces (Henan, Hubei) meet, is the transitional region from the north subtropical to warm temperate zone. The woody plants in southern and northern areas are relatively abundant. According to the preliminary statisticy, the woody plants comprise 543 species(Incl, app. and var.) in 181 genera and 71 families. Among them, for Gymnospermae, there are 5 families, 5 genera and 7 species; for Anginospermae, there are 66 families, 176 genera and 536 species; there are 12 world monotypic genera, and 9 endemic Chinese genera. Most of them are ancient or primitive in phylogenetics.The basic features of woody plants in the flora are briefly summarized as follows: (1)The floristic elements are comparatively rich and show more obvious transition; (2)The most species are typical composition of the subtropical and temperate zone; (3)There are many ancient and relic elements.The geographic distribution of woody plants in the flora can be divided into 14 types, in which the genera of the temperate and subtropic distribution patterns make up 65.0%, and the genera of tropics 35.0%.