The Impacts of the Basin Scale Hydrological Cycle to Water Budget of Wetlands in Nenjiang River Basin

Abstract

The relationship between the water budget of wetlands and the water cycle process in local river basin is bidirectional. The recovery and function performance of the wetland are based on this relationship. Hydrological models are the effective tool to detecting this link. The distributed hydrologic model was the key supports in this study and was used to quantitative identify the change of water budget of the wetlands which was impacted by the water cycle evolution in Nenjiang River basin in Northeast China. The results indicated that precipitation, runoff and evapotranspiration both in the basin and wetlands present similar declining trend. The precipitation is the major recharge source, and the evapotranspiration is the primary output of wetlands. The value of mean change in storage of the wetlands is negative which is caused by the decrease of the area of wetlands. The results of land use pattern evolution change surface inflow in the wetlands in the basin scenarios simulation indicated. These results suggested that water budget of wetlands is influenced by water cycle in basin. And some reasonable measures for wetlands management should not only base on its features, but also pay attention to hydrological regime in basin.