| 基于氮氧同位素技术的千岛湖流域典型山区河流硝酸盐来源解析 |
| 摘要点击 828 全文点击 101 投稿时间：2024-03-18 修订日期：2024-06-16 |
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| 中文关键词 氮同位素 氧同位素 硝酸盐污染 SIAR模型 季节性变化 贡献率 |
| 英文关键词 nitrogen isotope oxygen isotope nitrate pollution SIAR model seasonal variation contribution rate |
| 作者 | 单位 | E-mail | | 张子宁 | 江南大学环境与生态学院, 无锡 214122
中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | 1065534537@qq.com | | 许海 | 中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | | | 江威 | 杭州市生态环境局淳安分局, 杭州 311700 | | | 詹旭 | 江南大学环境与生态学院, 无锡 214122 | xuzhan@Jiangnan.edu.cn | | 朱广伟 | 中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | | | 孙宏伟 | 江南大学环境与生态学院, 无锡 214122
中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | | | 邱雨 | 中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | | | 王圆忆 | 中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | | | 吴铭杰 | 江南大学环境与生态学院, 无锡 214122
中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | | | 刘宇星 | 江南大学环境与生态学院, 无锡 214122
中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | | | 李慧赟 | 中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | | | 朱梦圆 | 中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | | | 秦伯强 | 中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | | | 张运林 | 中国科学院南京地理与湖泊研究所, 湖泊与流域水安全重点实验室, 南京 210008 | |
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| 中文摘要 |
| 千岛湖是长三角地区重要的饮用水水源地,其生态环境对周边地区具有重要的战略意义. 为了准确识别千岛湖入库的硝酸盐（NO3--N）污染来源及其空间分布特征,首次开展了千岛湖流域4条典型山区入湖河流流域的水样采集工作,分析不同区域的NO3--N浓度,并结合δ15N-NO3-和δ18O-NO3-双稳定同位素SIAR模型解析了各水系的NO3--N来源及其贡献率. 结果表明：①各流域氮浓度偏低, ρ[总氮（TN）]均值分布在0.99~4.31 mg·L-1之间,以NO3--N为主要的氮素来源,4条河流的NO3--N浓度有明显的季节差异,呈现出春季>冬季>夏季>秋季的趋势,其中春季的ρ（NO3--N）可达到秋季时期的3.2倍. ②各流域的δ15N-NO3-和δ18O-NO3-值分别为1.52‰~14.29‰和-2.76‰~10.13‰. ③4条河流均呈现出春夏季化肥和土壤氮的贡献率较大,分别约25%~51%和23%~39%,而秋冬季生活污水贡献率较大,约26%~67%. 研究显示,千岛湖流域主要的NO3--N污染源为农业面源污染,不同土地利用类型的NO3--N污染也具有一定的差异性,流域面积较大的区域在4个季节中NO3--N污染贡献变化幅度相对稳定,而流域面积较小的区域则有明显波动. 研究分析了千岛湖流域的主要NO3--N来源,为千岛湖流域水质管理和污染源控制提供了依据. |
| 英文摘要 |
| Qiandao Lake is an important source of drinking water in the Yangtze River Delta, and its ecological environment is of great strategic significance to the surrounding areas. To identify the sources and spatial distribution characteristics of nitrate （NO3--N） pollution in the Qiandao Lake, we conducted, for the first time, the collection of water samples from four typical mountainous inlet river basins in the Qiandao Lake Basin, analyzed the concentrations of NO3--N, and resolved different sources and their contribution in each water system by combining the δ15N-NO3- and δ18O-NO3- dual stable isotope analysis in R （SIAR） model. The results showed that： ① Nitrogen concentrations in the different watersheds were relatively low, with mean total nitrogen （TN） levels ranging from 0.99 to 4.31 mg·L-1. NO3--N emerged as the main nitrogen source, and conspicuous disparities were observed in NO3--N concentrations across the four rivers, consistently demonstrating a pattern of spring > winter > summer > autumn, of which the NO3--N concentration during spring could be up to 3.2 times of that observed during autumn. ② The values of δ15N-NO3- and δ18O-NO3- in each watershed ranged from 1.52‰ to 14.29‰ and from -2.76‰ to 10.13‰, respectively. ③ All four rivers showed a greater proportion of fertilizer and soil nitrogen during spring and summer, which accounted for approximately 25% to 51% and 23% to 39%, respectively, and a greater proportion of domestic sewage during autumn and winter, which accounted for approximately 26% to 67%. The study showed that the main source of NO3--N pollution in the Qiandao Lake Basin was agricultural non-point source pollution, and some variabilities were also observed in NO3--N pollution in different land-use type areas. NO3--N pollution contributions remained relatively stable across the larger basin area, while exhibiting significant fluctuations in the smaller basin area. This work analyzed the main sources of NO3--N in the Qiandao Lake Basin, providing a basis for water quality management and pollution source control in this area. |
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