Yunkai Great Mountain is located in the Southern fringe of south subtropical zone. There is enough heat for planting subtropical crops but not for tropical crops.
云开大山位于南亚热带南缘，种植亚热带作物热量有余，种热带作物常常不能安全越冬。
According to the paleobiogeographic analysis, the southern region of Qinling belonged to tropical - subtropical zone, while the northern region of Qinling to temperate zone in Triassic.
古生物地理分析表明：三叠纪时，秦岭北侧属于温带生物区系，秦岭南部属于热带-亚热带生物区系。
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