【摘要】 2007-2011年对千岛湖5个采样点进行了逐月水质调查,分析了透明度、总磷、总氮、高锰酸盐指数和叶绿素a在5年内的变化规律,运用综合营养状态指数(TLI)和修正的营养状态指数(TSIM)对其营养状态进行了评价。结果表明,2007-2011年,千岛湖叶绿素a平均值为(2.720±1.380)μg/L,透明度平均值为(5.599±0.942)m,总磷平均值为(0.015±0.002)mg/L,总氮平均值为(0.990±0.090)mg/L,高锰酸盐指数平均值为(0.857±0.168)mg/L。两种营养状态指数从上游向下游逐渐降低,季节上呈夏秋高冬春低的趋势。TLI和TSIM的均值分别为26.6和35.5,且逐年缓慢增加。总体上看,千岛湖研究期间处于从贫营养型向中营养型的过渡期。更多还原

【Abstract】 Through monthly monitoring the five sampling sites in Qiandao Lake during 2007-2011,the yearly change patterns of transparency,chlorophyll a(Chl.a),permanganate index(CODMn),total nitrogen(TN) and total phosphorus(TP) were investigated,and the spatial and temporal variations of water quality were assessed by two trophic state indices such as TLI and TSIM.The results showed that the 5-year average values of transparency,Chl.a,CODMn,TN,and TP were(5.599±0.942) m,(2.720±1.380) ug/L,(0.857±0.168) mg/L,(0.990±0.090 2) mg/L,and(0.015 1±0.001 83)mg/L,respectively.The two trophic indices gradually decreased from the upper reaches to the lower reaches,fluctuated seasonally with the maximum in summer and the minimum in winter,and increased slowly year by year with a 5-year mean value of 26.6 for TLI and 35.5 for TSIM.It was suggested that the 5 study-years was in the transitional period of trophic level from oligo-to meso-trophic status for this lake.更多还原