【摘要】 按植物区系的研究方法,对美溪林业局植物区系成分及植物区系分区特点进行了全面系统的研究。在认定该局有918种维管植物的基础上,对其科、属、种的区系组成进行了统计和分析。在14个较大的科中绝大多数为温带性质的科,共有543种,分属于177属,占全局维管束植物的59．2%,占总属数的50．2%,可见这些较大的科对本局内植被组成起着重要的作用。寡种属为128属、339种,占总种子植物属的39．6%,占植物种的38．8%；单属单种植物为149种,分别占种子植物属、种的46．1%和17．1%。在区系分区统计中,东北植物区系成分在区系成分中占主导地位,约占80%,此外还混有少量东西伯利亚、蒙古、华北植物成分。同时该局植物区系成分具有古老性和南北混合型的特点,体现该局历史上曾有过亚热带气候,在第四纪冰川影响下和现代气候作用下,形成孑遗种较多的特征。更多还原

【Abstract】 Floristic elements and its distribution characteristics in Meixi Forestry Bureau were systematically studied by the study method for flora.Statistical analysis of floristic composition was made according to the record of 918 species of vascular plants.Analysis of the floristic elements showed that among 14 bigger families that include at least 10 genera,most fami- lies are temperate distribution elements,and 538 species of plants belonging to 177 genera account for 59.2% of the total vascular plants and 50.2% of the total genera,which hold a dominant position.It is obvious that those bigger families play an important role in the species composition in this bureau.128 few-species genera and 339 species account for 59.6% of the total genera and 38.8% of the total seed plants of the bureau,and 149 species of single-genus comprise 46.1% and 17.1%, respectively. Northeast floristic elements hold a dominant position, mixed with a few East Siberian, Mongolia and North China floristic elements.Meanwhile,the floristic elements in the bureau have the ancient and north-south mixed characteristics,which prove that the bureau had semi-tropical climate in history,and remaining ancient plants are rich un- der the influences of glacier in the Quatenary Period and modern climate.更多还原