NH3-N and P concentrations in reservoirs were higher whose maximums were tested at site about several kilometers downstream from the dam.There were increasingly eutrophicating after dams built.

• 氮和磷浓度库区比非库区要高，最大值一般出现在大坝出水不远的断面，建坝后具有较明显的营养化趋势，时间分异性也在减弱。