| 摘要: |
| 基于可获取的太湖国控监测点位总氮监测数据，分析了1987—2016年太湖总氮浓度变化趋势。结果表明，近30年来，太湖湖体总氮浓度年均值在1.74~3.88 mg/L之间，总体呈先上升、后下降的波动变化趋势，1996年浓度达历史峰值；其变化具体可分为上升期、波动期、下降期三个阶段，约以10年为一个阶段。分湖区分析，西部湖区、北部湖区2000—2016年总氮年均浓度与全湖总氮浓度呈明显的正相关，为影响湖体总氮浓度的主要湖区。总氮多年月均值浓度变化显示，2000—2016年湖体总氮多年月均值年内呈较明显的季节变化规律，月均最大值、最小值分别出现在3月和9月。空间变化分析表明，西部湖区的宜武片区及南部湖区的湖州长兴片区为湖体总氮的两个污染扩散核心。湖体总氮主要受15条主要入湖河流汇入影响，这些河流总氮年均浓度整体高于湖体，是太湖总氮治理的重点。 |
| 关键词: 太湖 总氮 趋势分析 |
| DOI： |
| 分类号:X824 |
| 文献标识码:A |
| 基金项目:国家水体污染控制与治理科技重大专项基金自助资助项目（2012ZX07506-001） |
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| Changes of Total NitrogenConcentrationin Taihu lakeDuring1987—2016 |
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FAN Qing-hua，SHEN Hong-jun，ZHANG Tao，ZHANG Yong，LIU Lei，LV Xue-yan
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Jiangsu Provincial Environmental Monitoring Center, Nanjing, Jiangsu 210036, China
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| Abstract: |
| Based on the data of available nitrogen monitoring in Taihu Lake, the trend of total nitrogen concentration in Taihu Lake from 1987 to 2016 was analyzed.The result showed that the average annual concentration of total nitrogen in Taihu Lake is between 1.74 and 3.88 mg/L in the past 30 years, and the population has risen first and then fluctuates.In 1996, the average annual concentration of total nitrogen reached the historical peak.The change of total nitrogen concentration can be divided into three stages:rising period, fluctuation period and decline period, about ten years as a stage. The average annual concentration of total nitrogen in the western lake area and the northern lake area in 2000 ~ 2016 was positively correlated with the total nitrogen concentration in the whole lake, which was the main lake area influencing the total nitrogen concentration of the lake.The monthly mean change of total nitrogen for the years showed that the monthly mean variation of total nitrogen in the lake was from 2000 to 2016, and the monthly maximum and minimum were in March and September respectively.The spatial variation analysis shows that the Yiwu area in the western lake area and the HuzhouChangxing area in the southern lake area are the two pollution diffusion cores of total nitrogen in the lake. The total nitrogen concentration of the total lake is higher than that of the lake body, which is the focus of the total nitrogen treatment in Taihu Lake.The study can provide scientific reference for the prevention and control of total nitrogen pollution in Taihu Lake. |
| Key words: Taihu lake Total Nitrogen Trend analysis |
