Temporal trends in N & P concentrations and loads in relation to anthropogenic effects and discharge in Odense River 1964–2002

摘要: Using water quality data from 1964 to 2002, concentrations and loads of dissolved inorganic nitrogen (DIN) phosphate-phosphorus (PO4-P) in the Odense River were analyzed for trends periods subsequent following implementation Danish Action Plan I reduction nutrients environment (DAP) 1987. In between 1987 statistical significant increasing DIN PO4-P detected. However, generally showed stronger than 19 29 tested load tests non-significant results. 1980 nutrient reductions detected at all sites with strongest PO4-P. Also, combining several equally strong trends. Significant positive correlations discharge found throughout period using non-parametric Spearman Rank Correlation, suggesting soil leaching be main source. Conversely, changed significantly negative mostly positive, a phenomenon most likely due change phosphorus sources.