重庆市长寿湖水质营养状态调查评价及特征分析

Investigation evaluation and characteristics analysis of trophic state in Changshouhu Lake,Chongqing

为了解长寿湖水质营养状态,于2019年7月至2022年8月对长寿湖开展每季度一次的水质普查监测。采用综合营养状态指数法对水质营养状态进行了评价,采用含障碍的样条函数对全湖水质综合营养指数进行空间插值分析,最后对营养状态的影响因素进行了相关性分析。结果表明:长寿湖水体总磷、总氮、高锰酸盐指数分别为(0.10±0.04)、(1.45±0.50)、(5.0±1.3)mg/L,透明度为(1.02±0.54)m。综合营养状态指数为51.9±6.4,呈中营养至轻度富营养状态;秋冬季水质营养状态较轻、春夏季较重。受上游来水影响,东部湖区营养状态较轻,西部湖区营养状态较重。透明度、高锰酸盐指数与综合营养状态指数相关系数最高,是影响长寿湖水质营养状态的主要因素。

In order to understand the trophic status of Changshouhu Lake,water quality investigation monitoring were carried out quarterly from July 2019 to August 2022.The trophic status was evaluated by the comprehensive trophic level index method.Interpolation analysis of comprehensive trophic level index based on spline with barriers were developed in Changshouhu Lake,and correlation analysis on influencing factors of trophic status were performed.The results showed that the total phosphorus,the total nitrogen and the permanganate index were(0.10±0.04),(1.45±0.50),(5.0±1.3)mg/L,and the transparency were(1.02±0.54)m.The comprehensive trophic level index in Changshouhu Lake were 51.9±6.4,which showed middle nutrition-light eutrophic state.Water trophic state were light in autumn and winter while severe in spring and summer.Affected by upstream water quality,water trophic state were light in east zone of lake while severe in west.Transparency and permanganate index showed highest correlation coefficient with comprehensive trophic level index,so the trophic state in Changshouhu Lake were most affected by transparency and permanganate index.