摘要
为探明黑河金盆水库大气氮湿沉降污染特征,于水库主库区进行了为期1年的大气氮湿沉降监测,分析大气湿沉降主要氮污染物浓度和沉降通量特征及影响因素。结果表明,水库氮湿沉降质量浓度均值为2.80 mg/L,主要由NO_(3)^(-)-N和NH_(4)^(+)-N组成,占比分别为28%和46%;氮湿沉降质量浓度在冬季最高,为4.70 mg/L;湿沉降NH_(4)^(+)-N与NO_(3)^(-)-N质量浓度比大于1,表明农业活动是湿沉降氮的主要来源;氮湿沉降通量为29.74 kg/hm^(2),占径流TN输入负荷的1.7%;氮湿沉降通量与降水量显著正相关(P<0.05);单因子水质评价结果表明库区降水水质多为劣Ⅴ类,TN劣Ⅴ类占比达75%。金盆水库大气氮湿沉降水平超出我国主要湖泊水库营养氮沉降临界负荷,水体富营养化风险高。
In order to investigate the pollution characteristics of atmospheric nitrogen wet deposition in Jinpen Reservoir of Heihe River,atmospheric nitrogen wet deposition monitoring was carried out in the main reservoir area of Jinpen Reservoir for a period of one year,and the characteristics of the concentration and deposition fluxes of the main nitrogen pollutants and the factors affecting them were analyzed.The results showed that the mean total nitrogen wet deposition mass concentration in Jinpen Reservoir during the monitoring period was 2.80 mg/L,which mainly consisted of nitrate nitrogen and ammonia nitrogen,with a proportion of 28%and 46%,respectively;total nitrogen wet deposition concentration was highest in winter at 4.70 mg/L;the ratio of wet deposition ammonia nitrogen to nitrate nitrogen mass concentration is greater than 1.Agricultural activities are an important source of wet deposition nitrogen;the total nitrogen wet deposition flux was 29.74 kg/hm^(2),accounting for 1.7%of the total runoff nitrogen input load;nitrogen wet deposition fluxes were significantly and positively correlated(P<0.05)with precipitation;single factor water quality evaluation results show that the reservoir area precipitation water quality is mostly inferior class V,total nitrogen inferior class V exceeded the rate of 75%;the level of atmospheric nitrogen wet deposition in Jinpen Reservoir has exceeded the critical load of nutrient nitrogen deposition in major lake reservoirs in China,and the risk of eutrophication of water bodies in the reservoir area is high.
作者
吴树平
黄廷林
高爱平
马旭
王琦岩
WU Shu-ping;HUANG Ting-lin;GAO Ai-ping;MA Xu;WANG Qi-yan(Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province,Xi'an University of Architecture and Technology,Xi'an 710055,China;Shanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《环境科技》
2024年第5期1-6,共6页
Environmental Science and Technology
基金
国家重点研发计划项目(2022YFC3203602)
陕西省重点研发计划项目(2022ZDLSF06-08).
关键词
大气湿沉降
氮沉降
沉降通量
Atmospheric wet deposition
Nitrogen deposition
Deposition flux
