摘要
Ｔｈｅｔｈｒｅｅｒｉｖｅｒａｒｅａ（ｔｈｅｍｉｄｄｌｅｄｒａｉｎａｇｅａｒｅａｏｆｔｈｅＹａｒｌｕｎｇＺａｎｇｂｏＲｉｖｅｒｂｅｔｗｅｅｎｉｔｓｔｒｉｂｕｔａｒｉｅｓｏｆｔｈｅＬｈａｓａＲｉｖｅｒａｎｄｔｈｅＮｙａｎｇｑｕＲｉｖｅｒ）ｉｓａｎｅｃｏ...
The three river area (the middle drainage area of the Yarlung Zangbo River between
its tributaries of the Lhasa River and the Nyangqu River) is a rapid economic development area
in Xizang(Tibet) Autonomous Region. As the weather in this area is frigid with frequent wind and
little rain, the eco environment condition is extremely bad, and the resistance and
rehabilitation ability of the landscape system is weak. Therefore, in the implementation of
agriculture development program in the area, it is not advisable to adopt the traditional method
of changing grassland to agriculture land, instead, the agriculture landscape in the area should
be modified. The primary contents of the modification plan are to improve the middle and low
yield fields to the high yield fields with irrigation system, to transform the dry land on the
slopes, uneven land, dry and low yield fields to forest or grassland. So the problem of food
demand will be solved and the degenerating trend of eco environment will be controlled.
