Calculating ecological flow based on key functional group
The study of ecological flow is a hot field in ecology and hydrology.However,the existing methodologies do not con-sider the functional integrity of an eco-system.In this study,we simulated the nutritional relationships between the communities of an eco-system in Xiaoqinghe river basin using the model of Ecopath.After determining the key fishes,we analyzed the veloci-ty and water level demand of the key fishes by the habitat suitable index.Finally,coupling the velocity and water level demand of multiple species,we calculated the eco-flow by the Adapted Ecological Hydraulic Radius Approach.The results showed that the water requirements of the upper,middle,and lower reaches were 4.28 m3/s,0.74 m3/s,and 3.47 m3/s respectively in non-spawning season,and 23.52 m3/s,5.96 m3/s(or 8.65 m3/s),37.38 m3/s respectively in spawning season.Compared with the approach of Tennant,our method could keep the ecosystem′s health condition above the "average" level,and could satisfy the water requirement of the majority of aquatic organisms.Besides,this method shows the difference between spawning season and non-spawning season,thus gives reference for the seasonal regulation of water resources in the basin.
Ecopathkey functional groupecological flowAEHRAXiaoqinghe River Basin
国家科技期刊平台
NSTL
万方数据
维普
