Abstract: Based on 1∶50000 DEM, Poyang Lake Basin was divided into sub-basins by using ARCGIS92. For the balance of the 2008 period, water amount into the lake was revised on the basis of water balance under the condition of water amount into the lake divided into four parts which were rivers runoff (Ganjiang, Fuhe, Xinjiang, Raohe, Xiuhe), interval runoff, groundwater runoff, and precipitation. Further study on TP load of Poyang Lake demonstrated that total TP load into the lake was 7758t, with retention ratio of 10% approximately. The rivers load into the lake accounted for 87% of total TP load, corresponding to Ganjiang river load accounting for 57% of rivers load. Main low water period of rivers runoff mostly took place in January and December. On the basis of using main low water period load of river runoff as sole point source load, it was concluded that annual TP load contributions of point and non-point sources were 39% and 61% respectively.

Key words: Poyang Lake, water balance, TP, non-point source

摘要： 基于1∶5万DEM, 利用 ARCGIS92 将鄱阳湖流域划分为子流域。以2008年为均衡期, 入湖径流划分为河道径流( 赣江、抚河、信江、饶河、修河) 、区间径流、地下水径流与降水 4 个部分, 通过水量均衡对入湖水量进行修正。进一步研究总磷( TP) 负荷, 结果表明: TP 年总入湖负荷为7758 t, 湖泊滞留比例约为 10% , 河道入湖负荷占总入湖负荷的 87% , 赣江入湖负荷占河道入湖总负荷的57% 。河道径流主要枯水时段多集中在 12 月和 1 月, 以主要枯水时段负荷为单一点源负荷, 推求得到河道径流全年点源、非点源负荷, 二者负荷贡献率平均为 39% 和 61% , 非点源是首要的入湖污染来源。

关键词: 鄱阳湖, 水均衡, 总磷, 非点源