biogeographical divergence of the flora of yunnan, southwestern china initiated by the uplift of himalaya and extrusion of indochina block生物地理学的散度云南的植物,中国西南部由喜马拉雅山脉的隆起和挤压的印度支那.pdfVIP

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biogeographical divergence of the flora of yunnan, southwestern china initiated by the uplift of himalaya and extrusion of indochina block生物地理学的散度云南的植物,中国西南部由喜马拉雅山脉的隆起和挤压的印度支那.pdf

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biogeographical divergence of the flora of yunnan, southwestern china initiated by the uplift of himalaya and extrusion of indochina block生物地理学的散度云南的植物,中国西南部由喜马拉雅山脉的隆起和挤压的印度支那

Biogeographical Divergence of the Flora of Yunnan, Southwestern China Initiated by the Uplift of Himalaya and Extrusion of Indochina Block Zhu Hua* Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan, People’s Republic of China Abstract The floral composition of Yunnan is conspicuously linked to the biogeographical history of this extremely species-rich province in southwestern China. The floristic compositions of three representative regions in Yunnan were compared to reveal their variation with geography. From southern Yunnan, 4150 native species (including subspecies and varieties) from 1240 genera and 183 families of seed plants were recognized. From central Yunnan 3389 native species from 1095 genera and 167 families of seed plants were recognized. From northwestern Yunnan 6807 native species from 1296 genera and 166 families of seed plants were recognized. Although these three floras across Yunnan are similar in familial composition, similarities between the floras of southern and northwestern Yunnan are low at the generic and specific levels. The flora of northwestern Yunnan is dominated by families and genera with cosmopolitan and north temperate distributions, while the flora of southern Yunnan is dominated by tropical families and genera. Northwestern Yunnan is composed largely of temperate genera, of which the highest proportion has a north temperate distribution. In contrast, southern Yunnan has mainly tropical genera, of which most have a tropical Asian distribution. The flora of central Yunnan is a combination of southern and northwestern Yunnan. These three floras might be derived from a common Tertiary tropical or subtropical East Asian flora, but the geological history of each region has influenced its flora, and they have remained divergen