滇中高原湖泊水质的年内分异特征及影响因素

Characteristics and Influencing Factors of Intra-Annual Water Quality Variation of the Central Yunnan Plateau Lakes

摘要: 为分析滇中高原湖泊水质的年内分异特征及影响因素，采用水质指数(WQI)、综合营养指数(TLI)、Mann-Kendall检验和多元回归分析等方法进行研究。结果表明：1) 2021年夏季至2022年春季期间，抚仙湖水质优于杞麓湖与星云湖，星云湖春季水质优于夏季；2) 杞麓湖和星云湖的TLI均表现出夏季最高，春季最低的特征。抚仙湖水体营养盐含量低、总体变化平稳，冬春季节氮磷含量略高于夏秋季节；3) 杞麓湖夏季受氮、磷共同限制，其余时期主要受控于磷限制。星云湖在夏季受到氮限制，秋季和春季受氮、磷共同限制，冬季主要受到磷限制。抚仙湖在夏、秋、冬季受到氮、磷限制，春季转为氮限制。

Abstract: In order to analyze the intra-annual variability of water quality of lakes in the Central Yunnan Plateau and the factors affecting it, the water quality index (WQI), the comprehensive trophic index (TLI), the Mann-Kendall test and the multiple regression analysis were used to carry out the study. The results showed that: 1) the water quality of Fuxian Lake (FXL) was better than that of Qilu Lake (QLL) and Xingyun Lake (XYL) during the summer of 2021 to the spring of 2022, and the water quality of XYL was better than that of summer in spring; 2) the TLIs of QLL and XYL both showed the highest in the summer and the lowest in the spring. The nutrient content of FXL is low and the overall change is smooth, and the nitrogen and phosphorus content is slightly higher in winter and spring than in summer and fall; 3) QLL is limited by nitrogen and phosphorus in summer, and the rest of the period is mainly controlled by phosphorus limitation. XYL was limited by nitrogen in summer, jointly limited by nitrogen and phosphorus in fall and spring, and mainly limited by phosphorus in winter. FXL is limited by nitrogen and phosphorus in summer, fall and winter, and turns to nitrogen limitation in spring.