汉丰湖和高阳湖水体氮磷分布及影响因素研究

为了研究三峡水库蓄水及汉丰湖调节坝运行对湖库氮磷营养盐的影响，于2018年11月~2019年10月对汉丰湖和高阳湖进行逐月水样采集.结果表明：汉丰湖TN浓度为0.78~2.38㎎/L，TP浓度为0.03~0.13㎎/L；高阳湖TN浓度为0.57~2.48㎎/L，TP浓度为0.03~0.09㎎/L，两湖库全年易发生富营养化.汉丰湖和高阳湖水体氮素浓度变化趋势一致，水体氮污染主要来自径流污染、城市污水以及淹没土壤的释放；两湖库磷素时空差异显著，高阳湖水体磷浓度随水位的变化波动性显著，说明水位调节对磷循环产生更直接的影响.外源污染的输入、浮游植物生长以及气温变化是影响汉丰湖水体氮磷营养盐浓度的主要因素，而高阳湖水体氮磷浓度主要受水位波动的影响.

Spatiotemporal distribution and influencing factors of nitrogen and phosphorus in water column of Hanfeng Lake and Gaoyang Lake

Considering Hanfeng Lake dam running had the effect on nitrogen and phosphorus nutrient, sampling at multiple site were conducted from November in 2018 to October in 2019. Results showed that TN concentration of Hanfeng Lake ranged from 0.78 to 2.38mg/L, TP concentration ranged from 0.03 to 0.13mg/L; TN concentration of Gaoyang Lake ranged from 0.57 to 2.48mg/L, TP concentration ranged from 0.03 to 0.09mg/L, both of the lakes was on eutrophication. The concentration of nitrogen and phosphorus in Hanfeng Lake was related to water Chla, urban sewage discharge, water entertainment projects, agricultural non-point source pollution, industrial wastewater discharge, and particulate matter carried by surface runoff scouring. The concentration of nitrogen and phosphorus in Gaoyang Lake was not only affected by human production and life, but also cannot be separated from the joint action of soil erosion and water quality of the Yangtze River. The fluctuation of water level and water retention time may be the main influencing factors of the concentration of nitrogen and phosphorus in Gaoyang Lake.