Ecological water demand analysis in Arid Region Researches on ecological water demand of Wuliangsuhai Lake Study on the ecological water demands for typical estuaries in Haihe River Basin Water demand evaluation of riverside ecosystem in arid inland river basin: the case of Heihe River Basin Review on some issues of ecohydrology research at the watershed scale Study on ecological water demand based on assessment of ecosystem disturbance degree in the Baiyangdian Wetland Analysis on ecological water demand and eco-hydrological configuration of wetlands in Songliao Basin