亚洲北部与北美的北方森林区民族〔美〕亚瑟·荣恩吴疆编译在更新世最后一次冰川时代晚期，曾出现一个横跨白令海峡、连接西伯利亚与北美的广阔大陆桥。在这个陆桥存在的数万年间，这里的北部地区是完全包围着北冰洋的冻原带。在冻原的南部，常绿的森林带从斯堪的纳维亚延... North Asian and North American forests in the North [Arthur Ron] Wu Yan Compilation In the late Pleistocene Glacier, there was a vast continental bridge spanning the Bering Strait connecting Siberia to North America. In the tens of thousands of years of this land bridge, the northern part here is a tundra completely encircling the Arctic Ocean. In the southern part of the tundra, the evergreen forest stretches from Scandinavia ...