Abstract: Ecosystem services of Heihe River Basin including water conservation, soil retention, water purification, biodiversity sustaining, carbon storage and food supply in 2011 were estimated based on InVEST. Furthermore, the distribution of cold and hot zones, the spatial differentiation characteristics, and the comprehensive hotspots of these ecosystem services were calculated by the spatial statistical methods. The results showed that these ecosystem services presented spatially differential characteristics. Firstly, the upper reaches were the major water supply area, while the other ecosystem services were mainly concentrated in the middle reaches. In addition, the water supply and water purification services were much lower in the lower reaches than in the middle reaches. Among the main ecosystem types, grassland played the main role in providing ecosystem services. Secondly, the spatial pattern of hotspots presented the characteristic of “lowvalue zone located at the north and the downstream, while high-value zone mostly distributed at the south and the upstream, midstream of the basin”. The spatial differentiation of various types of ecosystem services mainly exhibited as lowlow and lowhigh types. This study provided a basis for determining the goal of watershed ecological protection and construction, and also supplied a significant reference for other river basins to carry out spatial evaluation of ecosystem services.

Key words: spring wheat cultivar, irrigation, trade off., nitrogen, resource utilization efficiency