Nutrient emissions to surface water from agriculture

An excess of nutrients in surface water may lead to excessive algal blooms, which, for example, significantly reduces visibility and may render the oxygen system problematic. Net emissions or losses are the waste loads that effectively end into surface water. Emissions of N and P from agriculture are calculated using the Nutrients Emission MOdel (NEMO).Agriculture has a significant share of the net emissions of nitrogen (N) and phosphorus (P) to surface water.The net emissions of nitrogen to surface water from agriculture show no clear evolution in the period 2010-2019. The trend for phosphorus seems to be slightly decreasing.地表水中营养物过剩可能引发大规模藻华暴发，此类现象会显著降低水体透明度，还可能导致水体溶解氧系统功能异常。净排放或净损失指最终进入地表水的污染物负荷。农业源氮（N）与磷（P）的排放量采用营养物排放模型（Nutrients Emission MOdel, NEMO）进行核算。农业是地表水氮、磷净排放的重要贡献来源。2010-2019年期间，农业源地表水氮净排放量未呈现明确的变化趋势；而磷的净排放量则呈现小幅下降态势。