Abstract:

 The distribution of water conservation in QinghaiTibet Plateau was explored using the principle of water balance and the meteorological data from 1980 to 2003. The spatialtemporal variations of water conservation capacity in QinghaiTibet Plateau through the years are monitored by use of RS and GIG method. The result shows that there are 3 zones in which the water conservation capacity is weakened continuingly: (1) the headstream of Yarlung Zangbo River, (2) the marginal land of south QinghaiTibet Plateau, (3) the provincial border regions of Qinghai and Gansu province. And there are 2 zones in which water conservation capacity is enhanced continuously: (1) the valley in middle reaches of Yarlung Zangbo River, (2) the Valley in middle reaches of Lancangjiang River and Jinshajiang River.

Key words: water conservation, land evapotranspiration, security of water resource