新安江水库主要入流营养盐的时间变化特征及其影响因素分析

流域上游来水是水库的重要补给源，其水质状况直接决定下游受纳水库的生态系统状态和功能，研究入库来水营养盐的时间演变特征并揭示其变化的影响因素，为水库水质管理提供重要科学依据。以新安江水库安徽辖区为研究区，分析了2007—2016年期间流域入库水质的变化特征，探讨水文、气象等环境条件对入库水质的影响。研究结果表明，2007年以来，COD_Mn和透明度表现为下降趋势，TN、TP、NH₃-N呈明显上升趋势，来水营养水平上升，但叶绿素a呈下降趋势。流域降水带来的水文情势的变化对来水水质起重要作用，来水中N、P营养盐丰水期显著高于枯水期，同流域降水过程显著正相关。

Time Variation Characteristics of the Main Inflow Nutrient at Xin'anjiang Reservoir and Its Impact factors in 2007-2016

The upper reach of basin is an important supply source of the reservoir. The water quality directly determines the status and function of ecosystem in downstream reservoir. Research on the time variation characteristics of inflow water nutrient and its impact factors can provide important scientific evidence for the management of reservoir water quality. Taking Xin''anjiang reservoir in Anhui province as study area, the variation characteristics of inflow water quality in 2007-2016 were analyzed, and the impact of hydrology and meteorology factors on local water quality was discussed in this paper. The results showed that since 2007, COD_Mn and SD showed a decline trend, TN, TP and NH₃-N were significantly increased, and the nutrient level of inflow water was increased, but Chl-a showed a decreasing trend. Changes of hydrological regimes due to rainfall play an important role on the inflow water quality, and the N, P nutrient concentration in wet season was significantly higher than that in dry season, which showed a significant positive correlation with precipitation process.