珠溪河流域土地利用变化对面源磷污染影响的研究

探讨土地利用类型变化对磷、泥沙负荷以及截留能力的影响，为制定珠溪河流域面源磷污染治理措施提供重要支撑，也为鄱阳湖流域磷污染精准防治提供科学依据。基于2010年和2018年土地利用数据，采用SWAT模型对珠溪河流域面源磷负荷、泥沙负荷以及径流进行了模拟研究，并结合水文水质实测数据对模型的模拟结果进行评价。结果表明：相关系数R2和Nash-Suttclife模型效率系数ENS均满足SWAT模型在研究区的适用要求；泥沙与总磷的负荷强度与耕地、建设用地的覆盖率呈正相关，与林地、草地的覆盖率呈负相关，且总磷负荷强度与泥沙负荷强度有较高的重合性；2010年、2018年土地利用数据的总磷、泥沙年均入河系数分别为0.535、0.736和0.558、0.752，2个时期的泥沙与总磷入河系数中北部大于南部。控制农业生产和农村生活的污染物排放是减少面源污染的重要措施，进行退耕还林或退耕还草能有效截留污染物质以及起到防沙固土的作用。

Impact of Land Use Change on Phosphorus Non-Point Source Pollution in Zhuxi River Basin

Discuss the impact of land use type changes on phosphorus pollution load, phosphorus, sediment load and interception capacity, provide important support for the formulation of non-point source phosphorus pollution control measures in the Zhuxi River Basin, and provide scientific basis for the precise prevention and control of phosphorus pollution in the Poyang Lake Basin the SWAT model was used to simulate non-point source phosphorus pollution in the Zhuxi River Basin, and the simulation results of the model were evaluated using the measured data of hydrology and water quality. The results show that the SWAT model has high simulation accuracy in the Zhuxi River Basin, and the model has applicability in this area. In addition, the load intensity of sediment and total phosphorus is positively correlated with the coverage of cropland and settlement, while is negatively related to the coverage of forest and grassland, and the total phosphorus load intensity and the sediment load intensity have a high coincidence. According to the data of land use from 2010 to 2018, the average annual inflow coefficients of total phosphorus and sediment are respectively 0.535, 0.736 and 0.558, 0.752, Lost rate of sediment and total phosphorus in the two periods are greater in the north and middle than in the south in the two periods. Controlling the discharge of pollutants from agricultural production and rural life is an important measure to reduce non-point source pollution. Returning farmland to forest or grassland can effectively intercept pollutants and play a role in preventing sand and soil.