The impact of scale change of land use on evapotranspiration in Nenjiang River basin
The results of hydrological study present uncertainty due to the existence of spatial and temporal heterogeneity. Downscaling is usually employed to decrease the impact of heterogeneity which is a function of scale, for example, discretization in hydrological model. However, it is a problem to confirm the smallest scale and how does it impact the results for scale changing. Perfect solutions to the problems above have not yet been found so far. The evapotranspiration and its spatial heterogeneity, distribution patterns were analyzed based on land use data in 2000 in Nenjiang River basin at various grid sizes (5km×5km, 10km×10km and 20km×20km). The results show that there is a similar tendency of spatial heterogeneity in land use type and evapotranspiration at different scales, and a smaller influence of scale change on the evapotranspiration, by which the center of distribution patterns moving to the type of land use with larger area.
land useevapotranspirationgrid sizespatial heterogeneityspatial patterns
国家科技期刊平台
NSTL
万方数据
维普
