Review on some issues of ecohydrology research at the watershed scale

Based on the leading aspect of the international ecohydrology development, the two primary subjects—the ecohydrological process and ecological water resource research field with their research progress of watershed ecohydrology currently are reviewed in this paper. Under the situation of global changing, the corresponding strategy of watershed ecological process towards hydrology circulation and the sustainable management about water-soil interface of watershed that based on land use and land coverage change are the frontier and core issues of the watershed ecohydrological process in future. According to ecological water requirement, the problems that exist in ecological water demand field was analyzed, and also the methods and problems about the evaluation for ecological water demand quantity in inner river channel and outer river channel were discussed. To set up a more appropriate evaluation system for ecological water demand is the key issue of ecological water requirement research at present, and a new theory system about water estimate and water programming that consider the ecological system as a primary water user is the basis of human society sustainable development in future.