Contradictory results for the long-term evolution of nitrogen and phosphorus concentrations in waters discharging from drained peatland forests need reconciliation. We gathered long-term (10–29 years) water quality data from 29 forested catchments, 18 forestry-drained and 11 undrained peatlands. Trend analysis of the nitrogen and phosphorus concentration data indicated variable trends from clearly decreasing to considerably increasing temporal trends. While the variations in phosphorus concentration trends over time did not correlate with any of our explanatory factors, trends in nitrogen concentrations correlated positively with tree stand volume in the catchments and temperature sum. A positive correlation of increasing nitrogen concentrations with temperature sum raises concerns of the future evolution of nitrogen dynamics under a warming climate. Furthermore, the correlation with tree stand volume is troublesome due to the generally accepted policy to tackle the climate crisis by enhancing tree growth. However, future research is still needed to assess which are the actual processes related to stand volume and temperature sum that contribute to increasing TN concentrations.

从排水泥炭地森林排放的水中氮和磷浓度长期演变的矛盾结果需要协调。我们收集了来自 29 个森林集水区、18 个森林排水区和 11 个未排水泥炭地的长期（10-29 年）水质数据。氮和磷浓度数据的趋势分析表明从明显减少到显着增加的时间趋势的变化趋势。虽然磷浓度趋势随时间的变化与我们的任何解释因素无关，但氮浓度的趋势与集水区的林分体积和温度总和呈正相关。氮浓度增加与温度总和的正相关引起了人们对气候变暖下氮动力学未来演变的担忧。此外，由于普遍接受的政策是通过促进树木生长来应对气候危机，因此与林分数量的相关性很麻烦。然而，未来的研究仍然需要评估哪些是与林体积和温度总和相关的实际过程，这些过程有助于增加 TN 浓度。