黑龙江省木本植物区系分析

黑龙江省有木本植物392种，隶属于42科90属。其中裸子植物4科8属34种，双子叶植物37科81属357种，单子叶植物1科1属1种。本省为大兴安岭植物区、东北植物区和蒙古草原植物区三区汇集之地，木本植物地理成分复杂，具有非常明显的温带性质：温带分布科虽然与热带分布科数目相同，但所含种数多，优势明显；温带分布属占75.86%，以北温带分布比例最高；温带分布种占80.43%，以东北分布居首位，其次是中国—日本分布。该区系木本植物起源古老，有珍稀濒危植物9种，特有植物14种及红松、黄檗等孑遗植物，为第三纪植物区系系统。

An analysis of the flora of woody plants in Heilongjiang Province

There are 392 species of woody plants in Heilongjiang province,belonging to 90 genera and 42 families,among which Gymnospermae have 4 families,8 genera and 34 species.Dicotyledoneae have 37 families,81 genera and 357 species and Monocotyledoneae have 1 family,1 genus and 1 species.Heilongjiang province is a region where three distributions meet,which are Daxinganling,Northeast China and Mongolia steppe plant areas,therefore the flora of woody plants is complex in geographical elements and is of obvious temperate distribution.Though families of temperate distribution are equal to those of tropic distribution,their included species are more in number and have obvious advantages.The temperate distribution genera make up(75.86) per cent,in which the northern temperate distribution elements have the highest proportion.The species in temperate distribution make up(80.43) per cent,in which the northeastern temperate distribution elements have the highest proportion and next is the Sino-Japon distribution elements.The woody plants in the area is age-old in origin,which contain 9 rare and threatened species,14 endemic species and some relic species such as korea pine,amur corktree.The flora of Heilongjiang province is of typical tertiary flora system.