Zhu Hua
Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan, P. R. China.
PLoS One. 2017 Jun 23;12(6):e0179966. doi: 10.1371/journal.pone.0179966. eCollection 2017.
The flora of Laos is composed of 5,005 species in 1,373 genera and 188 families of seed plants. Floristic and geographical attributes of the flora were analyzed. Tropical floristic elements at the family and generic levels contributed a majority (62.23% of the families and 82.30% of the genera) of the flora, of which the dominant geographical elements were pantropical distribution (42.02% of families) and tropical Asian distribution (30.08% of genera). This revealed that the flora of Lao PDR is tropical in nature and has a conspicuously tropical Asian affinity. Compared with the neighbouring countries of the Indochina peninsula, the flora of Laos has similar floristic composition and geographical elements. The floras of these Indochinese countries have similarities of more than 77.84% at the generic level, which suggests that they compose an affiliated biogeographical region. However, the flora of Laos showed the highest similarity to the flora of Vietnam (92.13%), followed by Myanmar (86.01%) at the generic level, but has less East Asian and North Temperate elements than Vietnam, and less North Temperate elements than Myanmar. These differences among the compared countries could be explained by the extrusion of the Indochinese block with the uplift of the Himalayas.
老挝的植物区系由188个科1373属的5005种种子植物组成。分析了该植物区系的植物区系和地理属性。科和属水平的热带植物区系成分占植物区系的大部分（62.23%的科和82.30%的属），其中主要的地理成分是泛热带分布（42.02%的科）和热带亚洲分布（30.08%的属）。这表明老挝人民民主共和国的植物区系本质上是热带的，并且具有明显的热带亚洲亲缘关系。与印度支那半岛的邻国相比，老挝的植物区系具有相似的植物区系组成和地理成分。这些印度支那国家的植物区系在属水平上的相似度超过77.84%，这表明它们构成一个附属生物地理区域。然而，老挝的植物区系在属水平上与越南的植物区系相似度最高（92.13%），其次是缅甸（86.01%），但与越南相比，东亚和北温带成分较少，与缅甸相比，北温带成分较少。比较国家之间的这些差异可以用印度支那地块随着喜马拉雅山脉隆升而发生的挤压来解释。
