摘要
为了探究滇池流域氮、磷干湿沉降对滇池水体外源输入营养盐的贡献率,于2021年收集了滇池流域六大功能区的雨水及降尘,测定大气沉降中不同形态氮、磷质量浓度,分析滇池流域氮、磷大气沉降分布特征,并估算氮、磷干湿沉降全年沉降通量及对滇池入湖负荷的贡献。结果表明:流域内全年大气总氮(TN)、总磷(TP)湿沉降通量分别为20.244~220.938、1.155~65.826 kg/km^(2),干沉降通量分别为44.275~481.120、4.255~111.840 kg/km^(2);工业生产和矿产开发功能区分别为流域氮、磷干湿沉降通量最高的区域。溶解性无机氮(DIN)和溶解性无机磷(DIP)是大气沉降中氮、磷的主要形态;流域内氮、磷大气沉降入湖负荷分别为1018.92、88.88 t,其中滇池湖面大气直接沉降负荷占流域入湖污染负荷总量的3.70%和2.35%,流域其他区域入湖系数换算下大气沉降入湖负荷在流域河流入湖负荷中的占比分别为8.69%和6.26%。流域氮、磷大气沉降已逐渐成为滇池外源污染物的重要来源之一,深入掌握其时空分布特征及入湖贡献率是进一步加强流域管理和减轻湖体外源污染物输入的重要前提。
In order to explore the contribution rate of dry and wet deposition of nitrogen and phosphorus to exogenous nutrients in the Dianchi Lake Basin,rainwater and dust fall in six functional areas of the Dianchi Lake Basin were collected in 2021,the mass concentrations of different forms of nitrogen and phosphorus in atmospheric deposition were measured,and the distribution characteristics of nitrogen and phosphorus atmospheric deposition in the Dianchi Lake Basin were analyzed.The annual deposition fluxes of nitrogen and phosphorus and their contribution rates to the loading of Dianchi Lake were also estimated.The results showed that the annual atmospheric TN and TP wet deposition fluxes were 20.244-220.938 kg/km^(2) and 1.155-65.826 kg/km^(2),and dry deposition fluxes were 44.275-481.120 kg/km^(2) and 4.255-111.840 kg/km^(2),respectively.The functional areas of industrial production and mineral exploitation were the areas with the highest nitrogen and phosphorus deposition fluxes,respectively.DIN and DIP were the main forms of nitrogen and phosphorus in atmospheric deposition.The average annual atmospheric deposition loads of nitrogen and phosphorus into the lake in the basin were 1018.92 and 88.88 t,respectively.The direct atmospheric deposition load on the lake surface of Dianchi Lake accounted for 3.70%and 2.35%of the total pollution load into the lake in the basin,respectively.The proportion of atmospheric deposition into the lake load in other areas of the basin was 8.69%and 6.26%,respectively,in the river inflow load of the basin.In summary,the atmospheric deposition of nitrogen and phosphorus in the basin has gradually become one of the important sources of exogenous pollutants in Dianchi Lake.In-depth understanding of its spatial and temporal distribution characteristics and contribution rate to the lake were important prerequisites for further strengthening basin management and reducing the input of exogenous pollutants into the lake.
作者
谢坤
吴雪
何佳
张英
付潇华
周鸿斌
邓伟明
朱启凤
XIE Kun;WU Xue;HE Jia;ZHANG Ying;FU Xiaohua;ZHOU Hongbin;DENG Weiming;ZHU Qifeng(Kunming Institute of Eco-Environmental Science,Kunming Yunnan 650032;Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650500)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2024年第6期882-889,895,共9页
Environmental Pollution & Control
基金
长江生态环境保护修复联合研究(二期)(No.2022-LHYJ-02-0511-01)
云南省技术创新人才培养对象项目(No.202305AD160060)。
关键词
滇池流域
大气沉降
氮
磷
沉降负荷
贡献率
Dianchi Lake Basin
atmospheric deposition
nitrogen
phosphorus
deposition load
contribution rate
