三峡水库及香溪河库湾理化特征的比较研究

根据2003年6月三峡水库初期蓄水后对香溪河库湾的常规监测,对该水域的理化特征及其动态进行了分析,并与三峡水库库首的数据进行了比较研究。结果显示库湾TN、NO3-N浓度要显著低于库首,前者两周年平均值为1.29mg/L,0.88mg/L,后者两周年平均值为1.62mg/L,1.22mg/L。而PO4-P则是库湾显著高于库首,并且在7—9月库首的TP/PO4-P有显著提高。结果同时表明库首的水土流失较严重,而库湾则有较好的水土保持。最后对TSIM的计算结果表明,由于TP、TN都处于高水平,库首呈现中营养化(TSIM>37),而库湾则呈现严重富营养化(TSIM>53)。

Comparative study on physicochemical characters between the Xiangxi Bay and the Three Gorges Reservoir

Based on the routine monitoring in Xiangxi Bay after the initial impounding in Three Gorges Reservoir in June,2003,the physicochemical indices and the dynamics were analyzed and compared with the data of the front region of Three Gorges Reservoir.The results indicated that the concentrations of TN,NO_3-N in Xiangxi Bay were lower than those in the reservoir significantly.The biyearly averages of TN,NO_3-N were 1.29mg/L,0.88mg/L in Xiangxi Bay and 1.62mg/L,1.22mg/L in the front reservoir.However,PO_4-P was higher in Xiangxi Bay than in the front reservoir,and monthly averages of TP/PO_4-P in the front reservoir were significantly higher than those in Xinagxi Bay during July to September.The results also showed that there were heavy soil erosion in the reservoir,while soil and water were kept better in Xiangxi Bay.Based on the evaluation of the trophic state indices(TSI_M),Three Gorges Reservoir was middle eutrophical(TSI_M>37),and Xiangxi Bay was eutrophical((TSI_M>53)) due to high phosphorus and nitrogenous pollution.