Based on the results of water sample measurements of nutrient concentrations at the Datong Station of Changjiang River from 1998 to 1999,combined with historiceal data of water quality,seasonal variations of nutrient concentrations and nutrient transports are discussed.Tthe following results have been obtained:(1)the fluxes of the nitrate nitrogen,ammonium nitrogen and nitrite nitrogen increased by time0series from 1962 to 1990,even if runoff volume had a little variation;(2)the concentrations and fluxes of the dissolved inorganic nitrogen (DIN)and dissolved inorganic phosphorus (DIP)increased notably with time,but those of th dissolved silicon(DSI)decreased pronouncedly,and (3) the concentrations and fluxes changed synchronously with time between the Datong Station and the Changjiang Estuary.
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