甘肃小陇山种子植物区系地理及多样性分析

The diversity and flora of spermophyte in Xiaolong mountain in Gansu

通过小陇山的野外调查及标本的鉴定整理,对小陇山种子植物的多样性及区系地理成分进行了分析和讨论.该林区有裸子植物7科18属49种,分别占全国同类别的70.00%、45.00%、25.39%,占世界同类别的63.64%、31.58%、7.31%;被子植物142科821属2451种,分别占全国同类别的48.80%、26.69%、9.12%,占世界同类别的25.63%、6.57%、1.09%.在中国植物区系分区系统中属中国-日本植物亚区、华北植物地区、黄土高原植物亚地区,区系组成具有明显的温带属性,区系成分以华北成分为主,并含有华中、喜马拉雅、蒙新成分,与周围区系有明显的连续性,是温带向亚热带过渡的植物基因库.

By identifying and arranging the sample in Xiaolong mountain, and field investigation, the diversity and flora of spermophyte in Xiaolong mountain are analyzed and discussed. There are 7 families, 18 genus, 49 species belongs to gymnosperm in this region, which are 70%, 45%, 25.39% of the country, 63. 64%, 31. 58%, 7.31% of the world respectively. There are also 142 families, 821 genus, 2 451 species of angiosperms, which are 48. 80%, 26.69%, 9.12% of the country, 25. 63%, 6. 57%, 1. 09% of the world respectively. The region belongs to China-Japan floral sub-region in the flora of China. Floral composition is typical temperate zone property, floral elements takes composition of North China as the core, it also contains central China, Himalayan, Inner Mongolia-Xinjiang. It obviously associates with the districts around and roles as the transition of plant gene pool from the temperate zone to the semitropics.