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首页> 外文期刊>Journal of geographical sciences >The five major changes in the evolution of the Loess Plateau
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The five major changes in the evolution of the Loess Plateau

机译：黄土高原演变的五个主要变化

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摘要

On the basis of the geomorphology, paleosol, paleoclimate and loess age, major changes of the Loess Plateau were studied. There are five major changes in the evolution of the Loess Plateau in China. Among them, the first, second, third and fourth major changes have taken place since the formation of the Loess Plateau, and the fifth major change will happen in 100 years. The first major change, which occurred at about 2.50 Ma BP, was a transition from red earth plateau to the Loess Plateau, and reflects the climate from the warm-sub-humid to the alteration between cold-and-dry and warm-and-humid. The driving force of this first major change was climate. The second major change, which took place at about 1.60 Ma BP, was a vital transition of the main rivers in this area from non-existence to existence, and represented an important change on the Loess Plateau's neotectonic uplift from the slow rising to periodically accelerated rising, and making the river's erosion go from feeble to strong. The driving force of the second major change is tectonic uplift. The third major change which occurred at about 150 ka, was a great transition of the Yellow River's inpouring from a lake outlet to a sea outlet. At that time, the Yellow River cut the Sanmen Gorge. The transition led to the transformation of loess material from internal transportation to external transportation. The driving force of the third major change was running water erosion. The fourth one that occurred at about 1.1 ka was a change of the Loess Plateau from natural erosion to erosion accelerated by human influences. The driving force of the fourth major change is mainly human activities. The fifth major change, which is the opposite change to the fourth one, in which the motive power is human activity, too.
机译：根据地貌，古土壤，古气候和黄土年龄，研究了黄土高原的主要变化。中国黄土高原的演变有五个主要变化。其中，自黄土高原形成以来，发生了第一，第二，第三和第四次重大变化，第五次重大变化将在100年内发生。第一个主要变化发生在大约2.50 Ma BP，是从红壤高原到黄土高原的过渡，反映了气候从暖湿到湿热和冷热干燥之间的变化。湿。第一个重大变化的驱动力是气候。第二个主要变化发生在大约1.60 Ma BP，是该地区主要河流从不存在到存在的重要过渡，代表了黄土高原新构造隆升的重要变化，从缓慢上升到定期加速。上升，使河水的侵蚀从微弱变为严重。第二大变化的驱动力是构造隆升。第三个主要变化发生在大约150 ka，是黄河从湖泊出口到海洋出口的巨大过渡。当时，黄河切入了三门峡。这种转变导致了黄土材料从内部运输向外部运输的转变。第三个主要变化的驱动力是自来水的侵蚀。发生在大约1.1 ka的第四次是黄土高原从自然侵蚀到人为影响加速侵蚀的变化。第四大变化的驱动力主要是人类活动。第五大变化，与第四变化相反，在第四变化中，动力也是人类的活动。

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