四川省金汤孔玉自然保护区种子植物区系分析

据初步调查 ,金汤孔玉自然保护区内的种子植物共 3 81种 ,分别属于 2 0 1属、6 8科 ,科可划为 1 2个分布型或变型 ,属可划为 2 3个分布型或变型 ,对科、属的区系分析结果表明 ,泛热带和温带性质的科共占 74 0 7% ,热带性质的属占总属数的 3 2 5 9% ,北温带分布型的属占总属数 3 4 2 5 % ,其他温带性质的属占总属数的 1 5 4 7% ;本地区与东亚 -北美间断、东亚和墨西哥间断、地中海区、西亚 -中亚、中亚 -喜马拉雅、东亚、中国 -喜马拉雅、中国 -日本等分布区联系紧密。保护区有 5种地域性特有种。区系特点是以温带性质为主、兼有热带性质 ,并具有起源的古老性、成分的复杂性、地理联系的广泛性

Study on the Spermatophyte Flora from the Jintang-Kongyu Nature Reserve,Sichuan

Jintang-Kongyu Nature Reserve is located in the east of the Hengduanshan Region, with altitude from 1700?m to 5712?m and area of 26908.6?hm~2. According to preliminary investigation and the collected documents, the spermatophyte flora from the Reserve consists of 381 species in 201 genara of 68 families (Among them, 20 species in 11 genara of 4 families belong to gymnospermae, 68 species in 41 genara of 6 families belong to monocotyledoneae, 293 species in 149 genara of 58 families belong to dicotyledon). This flora has taxa from primitive to advanced. The result of floristic analysis shows that all of the families can be grouped into 12 distribution types (or subtypes), and genera into 23. In families, Pan-tropic and temperate distributed components occupy 74.07% of the total. In genera, tropic components occupy 32.59% of the total, North Temperate distribution types occupy 34.25% of the total, other temperate components occupy 15.47% of the total. This flora has a tight relationship with the following distribution types: E.Asia and N.Amer., E.Asia and Mexico disjunction, Mediterranean, W.Asia to C.Asia, C.Asia to Himalaya and S.W.China, E.Asia, Sino-Himalaya, Sino-Japan. This flora has 5 species endemic to Hengduanshan Region or Sichuan. The characteristic of this flora mostly is temperate, but with lot of tropical, and with an archaic origination, complicated elements, an extensive relationship with the flora from neighboring regions.