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经过长期演化,中国动物地理格局才形成了现今大致以淮河-秦岭-横断山-喜马拉雅山一线为界线的两大动物区系,该线以北属于古北界,以南属于东洋界.中国北方第四纪的化石点有数百个之多,而其中有60多处含东洋界分子,其动物类别有20多个属种,其中以豪猪、猕猴、古菱齿象、额鼻角犀和水牛等属种最为常见.在第四纪,东洋界动物大量出现于华北地区,有三种解释:其一是动物群随气候波动或季节变化自南而北的迁徙;其二是这些动物原本就起源于北方,只是后来由于环境变化而退缩到了东洋界;其三是这些动物本来不是真正的喜热动物.研究表明,这些出现于北方地区的东洋界动物很少发现于黄土堆积中,并且含有这些化石的地点绝大多数都落在我国现代气候分区的暖温带范围内;在化石组合方面,这些喜暖动物很少与耐寒动物共生.由此看来,这些化石总体上是反映较温暖的气候条件,但并非很炎热.因为这些曾经出现在北方地区的东洋界分子,不是真正的热带动物,而是分布范围较广的东洋界分子,其中一些如今仍然生存于淮河以北;此外,至今在北方地区并未发现过真正的热带动物记录,例如鳞甲类、原猴类(懒猴和眼镜猴)和类人猿(巨猿、猩猩及长臂猿)等.在整个第四纪,尽管晚更新世时间跨度很短,但在此期间喜暖动物在北方地区出现的频次却很高,分布范围也最广,这说明晚更新世的气候最为动荡.
After long-term evolution, the pattern of animal geography in China formed the two major fauna now broadly defined by the Huaihe-Qinling-Hengduan Mountains-Himalayas line, which belongs to the Gu Bei boundary to the north and to the east in the north of China. Fossils in Quaternary have hundreds of fossils, of which more than 60 include the Orientalists, and their animal species have more than 20 genera, of which porcupine, macaque, ancient Ling tooth, Buffaloes and other species is the most common in the Quaternary, a large number of Oriental animals appear in North China, there are three explanations: one is with the fluctuations of the climate or seasonal changes from south to north migration; the second is that these animals had Originated in the north, but later retreated to the Toyohae due to environmental changes. The third is that these animals were not really thermophiles. Studies have shown that these Oriental animals that appear in the north are rarely found in loess deposits and contain Most of these fossils fall within the warm temperate zone of the modern climatic zonation of our country, and in the case of fossil assemblages, these warmthifer species rarely co-exist with cold-tolerant animals. The warmer climatic conditions are not very hot, because these former members of the Oriental circles that once appeared in the north are not truly tropical animals but rather are widely distributed members of the Orientan society, some of whom are still living in the north of the Huai River In addition, so far no real tropical animal records have been found in northern China, such as scales, primitive monkeys (sloth and tarsier) and apes (great apes, orangutans and gibbons), etc. Throughout Quaternary, Although the late Pleistocene time span was very short, the frequency of occurrence of the warm-temperate animals in the northern region during this period was very high and the distribution range was widest, indicating that the climate of Late Pleistocene was the most turbulent.