Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan, PR China.
PLoS One. 2013 May 28;8(5):e64213. doi: 10.1371/journal.pone.0064213. Print 2013.
The southern and tropical southeastern regions of the Yunnan Province in southwestern China have similar monsoonal climates and lowland tropical rain forest vegetations. The floras of both regions are dominated by tropical floristic elements (78.3% in southern Yunnan and 68.83% in southeastern Yunnan), and both belong to the Indo-Malaysian flora at the northern margin of tropical Asia. However, some temperate East Asian characteristic families are well represented in the flora of tropical southeastern Yunnan, while families characteristic of tropical Asia are well represented in the flora of southern Yunnan. Additionally, there are 14 mainly east Asian families in tropical southeastern Yunnan that are not found in southern Yunnan. Although the two regions share 80% of their genera, 237 genera are restricted to southern Yunnan, and 349 genera to tropical southeastern Yunnan. Furthermore, 57 genera with an East Asian distribution, 53 genera with a North temperate distribution, 22 genera endemic to China, and 17 genera with an East Asia and North America disjunct distribution are found only in tropical southeastern Yunnan. The flora of tropical southeastern Yunnan is more closely related to Eastern Asian flora, while the flora of southern Yunnan is more closely related to Indo-Malaysian flora. The divergence of the flora is well supported by the geological history of the region; the flora of tropical southeastern Yunnan was mainly derived from the South China Geoblock, while the southern Yunnan flora derived from the Shan-Thai Geoblock.
中国西南部云南省的南部和热带东南部地区具有相似的季风气候和低地热带雨林植被。这两个地区的植物区系都以热带植物区系元素为主（云南南部为 78.3%，云南东南部为 68.83%），都属于热带亚洲北部边缘的印度-马来植物区系。然而，一些温带东亚特征科在热带云南东南部的植物区系中得到了很好的代表，而在云南南部的植物区系中则以热带亚洲特征科为主。此外，热带云南东南部有 14 个主要的东亚科，而云南南部没有。尽管这两个地区有 80%的属是共同的，但有 237 个属仅局限于云南南部，349 个属局限于热带云南东南部。此外，有 57 个属具有东亚分布，53 个属具有北温带分布，22 个属为中国特有，17 个属具有东亚和北美间断分布，这些属仅存在于热带云南东南部。热带云南东南部的植物区系与东亚植物区系更为密切相关，而云南南部的植物区系与印度-马来植物区系更为密切相关。该植物区系的分化得到了该地区地质历史的很好支持；热带云南东南部的植物区系主要来源于华南地块，而云南南部的植物区系则来源于掸-泰地块。
