黑龙江兰远草原自然保护区种子植物组成及区系地理成分分析

Study on wetland Spermatophyte Constituent and Floristic in Heilongjiang Lanyuan Grassland Natural Reserve

黑龙江兰远草原自然保护区种子植物共有53科177属363种,植物区系组成中最大科是菊科,其次为禾本科和莎草科;除世界分布科外,温带分布科占第1位;属的地理成分中以北温带(含变型)占优势,有69属,占总属数的51.49%;种的区系以温带成分(79.69%)占绝对优势。区系特征表现为:优势科现象明显,单种属和寡种属占据比率较高;地理成分优势性显著,来源较广泛。

There are 363 species of seed plants in Heilongjiang Lanyuan Grassland Natural Reserve,belonging to 177 genera and 53 families;the largest family is Compositae,next family are Gramineae and Cyperaceae.At family level,besides cosmopolitan family,the temperate type is the main elements.At genus level,the geographical components is mainly the north temperate type（containing variety）,containing 69 genera,occupying 51.49% of the total number of genera.At species level,the geographical components is mainly temperate foristic elements（79.69%） in this flora.The basic characteristics of the flora are follows： Dominant family is prominent in this flora;The genera with single species and few species occupied high percentage of the total number;The flora is various in floristic elements.