东莞市农业面源污染变化趋势分析

Analysis on the Change Trend of Agricultural Non-point Source Pollution in Dongguan

通过计算2000年和2010年东莞市的农业面源污染负荷排放量和入河量，分析过去十年来东莞市农业面源污染分布特征和变化趋势。研究结果表明：2000～2010年东莞市农业面源污染负荷呈下降趋势。其中，总磷入河量的降幅最大，达73.5％；农村生活污水和固体废弃物的农业面源贡献率呈增长趋势，化肥施用和分散式禽畜废水的贡献率呈下降趋势，其中分散式禽畜废水的贡献率下降幅度最大。

This paper presents an analysis of the distribution characteristics and change trend of agricultural non -point source pollution over the past decade in Dongguan .Based on the calculation of the emission load and the quantity into river of the agricultural non-point source pollution in 2000 and 2010 .Results show that： the agricultural non-point source pollution load in Dongguan has declined overall from 2000 to 2010.Particularly, the amplitude reduction of the quantity into river of TP is 73.5%, which is the largest .As for the contribution rate of agricultural non-point source pollution , the contribution rates of rural domestic wastewater and solid waste show an increasing trend;while chemical fertilizer application and distributed livestock wastewater show a reducing trend , and the distributed livestock wastewater ’ s reducing trend is the most remarkable .