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晚更新世末次冰期是全球第四纪气候极为严寒的时期,对我国东部的海面升降、气候带移动、黄土扩张和动植物演替等都产生巨大的影响。纬向和垂向多年冻土带界线变化是自然环境变迁最明显反映之一。我国东部各种反映寒冷环境自然信息的相继发现,证明末次冰期(尤其是它的最盛期即主玉木冰期)冻土带南界和下界曾作明显的南迁和下移。但是迄今为止,对于这些界线的位置、走向和高度还存在着重大的意见分歧。有的认为南界在松辽分水
Late Pleistocene The last glacial period was the period of extremely cold Quaternary climate in the world, which had a huge impact on the sea surface movements, climate movement, loess expansion and plant and animal succession in eastern China. Changes in zonal and vertical permafrost boundaries are one of the most obvious signs of changes in the natural environment. The successive discoveries of the natural information reflecting the cold environment in the eastern part of our country have proved that the southern and lower tundra of the tundra in the last glacial period (especially its tallest period, ie the main tamarin ice age) have been obviously moved southwards and downwards. However, so far, there have been major differences of opinion about the location, orientation and height of these boundaries. Some think that the South divide in Songliao