Natural Stand and Its Water Requirement in Lower Reach of Heihe River

The ecological evolution process was analyzed with RS data, and a quantitative method of determining ecological water requirement of natural stand in arid lower reach of Heihe River was developed, by utilizing RS technique and data to divide the area into many different ecological blocks, and based on spot-tested data of vegetative physiology water demand. The ecological water requirement of natural stand in lower reach of Heihe River was calculated with the method and introduced and analyzed in this paper.