雅鲁藏布江下游河谷水汽通道初探

雅鲁藏布江下游河谷,就象撕裂了青藏高原东南地面的一个巨大裂口,构成印度洋湿暖气流伸入高原内部的主要通道。通道作用的得到加强和发挥,主要在第四纪中更新世以后。通道的作用对高原雨季的起始和降水起主导作用,并起到沟通喜马拉雅山南北生物交流的走廓作用,使这里成为生物物种分化变异、生物区系最丰富的地方。通道作用还对人类休养生息提供良好的自然环境,对一系列自然地理现象也有明显的影响。     

STUDY ON THE MOISTURE PASSAGE ON THE LOWER REACHES OF THE YARLUNG ZANGBO RIVER

A series of gorges on the lower reaches of the Yarlung Zangbo River is like an enormous crevice splitting the southeastern Qinghai-Xizang (Tibet)Plateau to create a passage through which warm, wet air flow from the Indian Ocean reaches the inner part of the plateau. This moisture passage was mainly strengthened after the Pleistocene epoch in the Quaternary period and has played a major role in affecting the beginning date of the rainy season and the amount of the plateau's rainfall. It has also served as a corridor for the living things on the southern and the northern sides of the Himalayas to mingle with each other. The region along this passage is abundant in evidences of species of differentiation, variation and biological division. Also the passage has provided a favorable environment for human beings and affected natural phenomena there.