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引用本文:殷超,杨海全,陈敬安,郭建阳,王敬富,张征,唐续尹.基于水化学和氮氧同位素的贵州草海丰水期水体硝酸盐来源辨析.湖泊科学,2020,32(4):989-998. DOI:
YIN Chao,YANG Haiquan,CHEN Jing'an,GUO Jianyang,WANG Jingfu,ZHANG Zheng,TANG Xuyin.Tracing nitrate sources with dual isotopes and hydrochemical characteristics during wet season in Lake Caohai, Guizhou Province. J. Lake Sci.2020,32(4):989-998. DOI:
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基于水化学和氮氧同位素的贵州草海丰水期水体硝酸盐来源辨析
殷超1,2, 杨海全1, 陈敬安1, 郭建阳1, 王敬富1, 张征3, 唐续尹1,2
1.中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550081;2.中国科学院大学, 北京 100049;3.西安科技大学测绘科学与技术学院, 西安 710054
摘要:
为明确草海湖水及其入湖河流硝酸盐污染的主要来源,定量分析各来源的贡献率,对草海湖水与入湖河流水化学特征和水体硝酸盐的氮氧同位素组成进行了系统研究.通过对草海湖水、河水、井水丰水期水体理化参数和同位素分析发现:湖水的NO3-/Cl-比值和Cl-浓度表明其主要受牲畜粪便和城镇污水输入的影响,而河水与井水则受农业活动和城镇污水的共同影响.δD-water与δ18O-water显示草海水体主要源于大气降水,并有较强的蒸发作用.湖水δ15N-NO3-和δ18O-NO3-值分别为-5.56‰~11.30‰和0.02‰~25.40‰,较河水偏负而较井水偏正.稳定同位素混合模型(SIAR)计算结果表明草海湖水及其入湖河流硝酸盐主要源于化肥、土壤有机氮、牲畜粪便相关的农业活动,其贡献率在50%以上;城镇污水贡献率在22%左右;大气降水的贡献主要体现在湖水中.
关键词:  硝酸盐  来源  氮氧同位素  贡献率  草海  丰水期
DOI:
分类号:
基金项目:贵州省重大科技专项项目(黔科合重大专项字[2016]3022号)、国家自然科学基金项目(U1612441,41807394)和贵州省科学技术基金项目(黔科合基础[2018]1174)联合资助.
Tracing nitrate sources with dual isotopes and hydrochemical characteristics during wet season in Lake Caohai, Guizhou Province
YIN Chao1,2, YANG Haiquan1, CHEN Jing'an1, GUO Jianyang1, WANG Jingfu1, ZHANG Zheng3, TANG Xuyin1,2
1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China;3.College of Geomatics, Xi'an University of Science and Technology, Xi'an 710054, P. R. China
Abstract:
The nitrogen and oxygen isotopic composition and hydrochemical characteristics of water were studied systematically to determine the main sources of nitrate in Lake Caohai and its rivers, and the contributions of each source were quantitatively analyzed. The ratio of NO3-/Cl- to Cl- in the lake water showed that the lake was mainly affected by livestock manure and urban sewage in wet season, while the ratio in rivers and wells indicated that rivers were affected by agricultural activities and urban sewage. The analysis of δD-water and δ18O-water showed that atmospheric precipitation was the main source of water in Lake Caohai and its rivers, with a strong evaporation. The value of δ15N-NO3- and δ18O-NO3- in lake water were -5.56‰-11.30‰ and 0.02‰-25.40‰ respectively, which were more negative than the rivers and more positive than the wells. The results of SIAR model showed that nitrate in Lake Caohai and its rivers mainly came from agricultural activities related to fertilizer, soil organic N and livestock manure, and its contributions was more than 60%. The contribution rate of urban sewage was about 25%. The contribution of atmospheric precipitation was mainly reflected in the lake water.
Key words:  Nitrate  sources  δ15N-NO3- and δ18O-NO3-  contributions  Lake Caohai  wet season
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