阳宗海叶绿素a、磷、氮动态特征及富营养化趋势

分析2002-2012年阳宗海TN、TP、Chl-a、氮磷比的动态变化特征及相互关系，并用综合营养状态指数法评价阳宗海的富营养化状态。结果表明：阳宗海富营养化呈上升趋势，2007年从之前的贫营养级上升为中营养级；Chl-a、TN、TP浓度在2007年后均呈快速上升趋势。 Chl-a浓度与TN、TP浓度呈正相关，且氮磷比越接近阈值16∶1，Chl-a浓度上升就越快。指出若营养盐输入得不到有效控制，预测阳宗海将在2017年前后达到富营养级水平，水质将进一步下降。

Dynamic characteristics of nitrogen, phosphorus, chlorophyll a and

The dynamic characteristics of total nitrogen （ TN） , total phosphorus （ TP） , chlorophyll a （ Chl-a） , and the N/P ratio, and the correlations between these indices in Yangzonghai Lake from 2002 to 2012 were analyzed. The eutrophication status of the lake was evaluated using the comprehensive nutrition index method .The study results show that the eutrophication level of the lake had an increasing trend .Around the year 2007 , the level of the eutrophication increased from a low level to a medium level .The concentrations of Chl-a, TN, and TP showed a rapidly increasing trend after the year 2007 .The concentration of Chl-a was positively correlated with the concentrations of TN and TP , and the concentration of Chl-a increased faster as the N/P ratio was close to 16：1 .It was found that , if the nutrient salt input cannot be reduced effectively , the lake will be at a eutrophic status around the year 2017 , and the water quality will deteriorate further .