中国第四纪哺乳动物地理区划

中国第四纪哺乳动物地理区可划分为古北界的北方区及其东北亚区，属东洋界的南方区及其东部位于二者之间的过渡区。南北两个区系的雏型早已出现，但非常明确而具体，且涉及到几乎各主要哺乳动物目主要始于更新世的早期，北方区与南方区的分异在中更新世已基本稳定，其界线大约位于秦岭山嵴。晚更新世时，南北之间的界线从秦岭的某个地段转向南，沿阿坝若尔盖等地青藏高原的东缘而下，从而为现代动物地理区系的形成奠定了基础。东部过

ZOOGEOGRAPHICAL DIVISSIONS OF QUATERNARY MAMMALIAN FAUNASINCHINA XUE

Zoogeographical regions of Quaternary mammalian faunas of China can be divided into the NorthChina region and its Northeast subregion,the South China region and the transitional region betweenthe North and South in the eastern part of China. The ridge area of Qinling Mountains is considered asthe boundary of the North and the South regions which started obviously in the late Early Plcistocene orthe early Middle Pleistocene.Owing to some of the main members such as:Coelodonta antiquitatis,Bosprimigenius,Equus hemionus,Gazella of.przewalskyi,Myospalax fontanieri etc.of the Late Pleis-tocene fauna in north China were discovered from the deposits of eastern Sichuan,such as Aba,Luhuo,we would consider easily that the area of north China region in the Late Pleistocene had expanded,andthe boundary of the North and South regions might be turned from somewhere ofQinling Mountains,then,along the eastern margin ofQinghai-Xizang plateau down to the South.It is true that there is atransitional region,but it owns its new meaning is different from the previ-ous Huaihe transitional region.It was situated between the North and the South.in the eastern part ofChina Its area is much bigger and its age started much earlier than those of the previous one. It reachedLantian,Shaanxi in the late of Early Pleixtocene. Then,moved eastward,and the area of this regionbecame smaller. Since the late of Middle Pleistocene on,the transitional region area was limited to theHuang- Huai plain and sometimes even to the south of Yangtze River.In general,the transitional areamoved eastward along with the uplift of Qinling Mountains firstly,then southward or northward alongwith the climate became warmer and humid or cooler and drier.