【摘要】 三峡库区及其上游区是我国水土流失的重要地区。2003年6~12月三峡水库成库后,在三峡水库设置6个水平监测断面和2个垂直断面,每月对营养盐(NH3-N,NO2-N,NO3-N,TN,TP)进行浓度监测。结果表明,6个测点表层水NH3-N、NO2-N、NO3-N、TN、TP含量均值分别为0.11mg/L,0.019mg/L,1.28mg/L,1.62mg/L,0.13mg/L。沿水流方向TN浓度逐渐增高,TP浓度逐渐降低。在同一位置垂直方向按3个不同水深(表层、0.6倍水深和0.8倍水深)设置测点。连续7个月测试结果表明,营养盐在垂直方向上差异不明显。总磷浓度变化与流量变化有很大关系,总磷浓度最大值均出现在丰水期,最小值为枯水期。更多还原

【Abstract】 The Three Gorges and upstream areas is the most severe soil erosion areas in China. The concentration of NH₃-N,NO₂-N,NO₃-N,TN and TP were determined every month during June to December in 2003.Six horizontal monitoring sites and two vertical sites were set in Three Gorges reservoir. The results showed that the six surface layer water mean concentration of NH₃-N,NO₂-N,NO₃-N,TN,TP were 0.11 mg/L,0.019 mg/L,1.28 mg/L,1.62 mg/L,0.13 mg/L respectively. Along the flow direction, the concentration of TP were depressed distinctly and TN were increased. There were not the trend on NO₂-N,NO₃-N and NH₃-N.According to different depth （surface,0.6depth and 0.8depth）,three monitoring sites were set in the direction of vertical. Through successive seven months monitoring, it indicated concentration of nutrient were not variety distinctly. Changing of phosphorus concentration was related to flow of the river. The maximum of total phosphorus was appeared in high flow season ,and the minimum was appeared in low flow season.更多还原