TRENDS IN NITROGEN TRANSPROT IN SWEDISH RIVERS

摘要

Concern about nitrogen loads in marine environemnts has drawn attention to the existence and possible causes of long-term trends in nitrogen transport in rivers. The present study was based on data from the Swedish enviornmental monitoring programme for surface water quality; the continutiy of tehese data is itnernationally unique. A recently developed semiparametric method was employed to study the development of relationships between runoff and river transport of nitrogen since 1971; the observed relationships were then used to produce time series of flow-normalised transports for 66 sites in 39 river basins.