摘要
为了深入探究三峡水库氮形态污染特征,采用野外调查和室内实验相结合的方法,系统分析了三峡水库4个调度期8个断面的水质监测数据,对水体氮形态浓度和时空分布特征和氮形态之间及其与水体环境因子之间的相关性进行了研究。结果表明:TN-N浓度范围为1.45~5.34 mg/L,超过国际公认的发生富营养化阈值,其主要形态为TDN-N,TDN-N主要形态为DIN-N,DIN-N主要形态为NO_(3)^(-)-N,氮形态分布受水体pH值和EC的影响较为显著。蓄水期、低水位期和泄水期TN-N,TDN-N,NO_(3)^(-)-N两两之间显著正相关,三者具有一定的同源性。空间上,4个调度期TN-N,TDN-N,NO_(3)^(-)-N沿程分布趋势相似,从朱沱至寸滩整体呈先升后降的趋势;NH_(4)^(+)-N和NO_(2)^(-)-N变化幅度不大,空间差异可能主要受人类活动污染输入影响。季节上,TN-N,TDN-N,NO_(3)^(-)-N,NH_(4)^(+)-N变化趋势相似,表现为“高水位期>低水位期”,NO_(2)^(-)-N表现相反。季节变化可能主要与水库调度运行模式和气温、降雨等季节性因素有关。
In order to explore the pollution characteristics of nitrogen form in the Three Gorges Reservoir,a combination of field surveys and laboratory experiments was used to systematically analyze the water quality monitoring data of eight sections of the Three Gorges Reservoir in four scheduling periods.The concentration and spatiotemporal distribution characteristics of different nitrogen forms were studied,and the correlations between different nitrogen forms and environmental factors were also studied in four scheduling periods of the Three Gorges Reservoir.The results indicated that the concentration of TN-N in water of the Three Gorges Reservoir were 1.45~5.34 mg/L,which exceeded the internationally recognized threshold level of eutrophication,TDN-N was the main chemical species of TN-N,DIN-N was the main chemical species of TDN-N,NO_(3)^(-)-N was the main chemical species of DIN-N;the distribution of nitrogen forms was significantly affected by pH value and EC of the water;significant positive correlations among TN-N,TDN-N and NO_(3)^(-)-N were found during the storage period,low water level period,and drainage period of the Three Gorges Reservoir,indicating that TN-N,TDN-N and NO_(3)^(-)-N might share the same source;similar patterns of spatial distribution in water were observed for TN-N,TDN-N and NO_(3)^(-)-N,and an upward trend and then a downward trend were found from the upstream Zhutuo section to Cuntan section;ammonium nitrogen(NH_(4)^(+)-N)and nitrite nitrogen(NO_(2)^(-)-N)did not show significant change;spatial differences might be mainly attributed to the pollution input by human activities;similar patterns of seasonal distribution in water were observed for TN-N,TDN-N,NO_(3)^(-)-N and NH_(4)^(+)-N,showing the following decreasing order:high water level period>low water level period;seasonal trend of NO_(2)^(-)-N was shown as the opposite.The seasonal changes might be mainly related to the operation mode of reservoir and seasonal factors such as temperature and rainfall.
作者
时瑶
赵艳民
秦延文
马迎群
韩超南
张雷
杨晨晨
刘志超
SHI Yao;ZHAO Yanmin;QIN Yanwen;MA Yingqun;HAN Chaonan;ZHANG Lei;YANG Chenchen;LIU Zhichao(State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Water Environmental Management and Research Center,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;School of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)
出处
《水土保持研究》
CSCD
北大核心
2021年第6期9-16,24,共9页
Research of Soil and Water Conservation
基金
国家重点研发计划项目“三峡水库运行背景下水污染综合调控模式研究”(2017YFC0404702)。
关键词
三峡水库
氮形态
水库调度期
空间分布
季节分布
Three Gorges Reservoir
nitrogen forms
reservoir scheduling periods
spatial distribution
seasonal distribution
