Advances in biogeography of the tropical rain forest in southern

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The tropical rainforest of southern Yunnan, which is similar to the equatorial rainforest of Asia in floristic composition and physiognomy, is a type of tropical Asian rainforest. Its tropical floristic elements contribute more than 90% at the generic level and more than 80% at the specific level to the total flora. Those of typical tropical Asian distribution contribute about 75% of the species. Occurring at the northern edge of the tropical zone (up to 24°40’ N), the tropical rainforest of Yunnan differs from the equatorial rainforest in having deciduous trees in the canopy layer and fewer megaphanerophytes and epiphytes, but more abundant lianas as well as more plants with microphyllous leaves. It is suggested that the tropical rainforest did not emerge until the late Tertiary in the region, and that the rainforest is more dependent on topography and local habitats than on the regional climate.