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Identifying diffused nitrate sources in a stream in an agricultural field using a dual isotopic approach.
Ding, Jingtao; Xi, Beidou; Gao, Rutai; He, Liansheng; Liu, Hongliang; Dai, Xuanli; Yu, Yijun.
Afiliación
  • Ding J; School of Environment, Beijing Normal University, Beijing 100875, China.
  • Xi B; Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: xbd100012@163.com.
  • Gao R; Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
  • He L; Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
  • Liu H; Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
  • Dai X; Changzhou Environmental Monitoring Center, Jiangsu 213001, China.
  • Yu Y; Changzhou Environmental Monitoring Center, Jiangsu 213001, China.
Sci Total Environ ; 484: 10-8, 2014 Jun 15.
Article en En | MEDLINE | ID: mdl-24686140
Nitrate (NO3(-)) pollution is a severe problem in aquatic systems in Taihu Lake Basin in China. A dual isotope approach (δ(15)NNO3(-) and δ(18)ONO3(-)) was applied to identify diffused NO3(-) inputs in a stream in an agricultural field at the basin in 2013. The site-specific isotopic characteristics of five NO3(-) sources (atmospheric deposition, AD; NO3(-) derived from soil organic matter nitrification, NS; NO3(-) derived from chemical fertilizer nitrification, NF; groundwater, GW; and manure and sewage, M&S) were identified. NO3(-) concentrations in the stream during the rainy season [mean±standard deviation (SD)=2.5±0.4mg/L] were lower than those during the dry season (mean±SD=4.0±0.5mg/L), whereas the δ(18)ONO3(-) values during the rainy season (mean±SD=+12.3±3.6‰) were higher than those during the dry season (mean±SD=+0.9±1.9‰). Both chemical and isotopic characteristics indicated that mixing with atmospheric NO3(-) resulted in the high δ(18)O values during the rainy season, whereas NS and M&S were the dominant NO3(-) sources during the dry season. A Bayesian model was used to determine the contribution of each NO3(-) source to total stream NO3(-). Results showed that reduced N nitrification in soil zones (including soil organic matter and fertilizer) was the main NO3(-) source throughout the year. M&S contributed more NO3(-) during the dry season (22.4%) than during the rainy season (17.8%). AD generated substantial amounts of NO3(-) in May (18.4%), June (29.8%), and July (24.5%). With the assessment of temporal variation of diffused NO3(-) sources in agricultural field, improved agricultural management practices can be implemented to protect the water resource and avoid further water quality deterioration in Taihu Lake Basin.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Contaminación Química del Agua / Monitoreo del Ambiente / Ríos / Agricultura / Nitratos Tipo de estudio: Prognostic_studies País/Región como asunto: Asia Idioma: En Revista: Sci Total Environ Año: 2014 Tipo del documento: Article País de afiliación: China Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Contaminación Química del Agua / Monitoreo del Ambiente / Ríos / Agricultura / Nitratos Tipo de estudio: Prognostic_studies País/Región como asunto: Asia Idioma: En Revista: Sci Total Environ Año: 2014 Tipo del documento: Article País de afiliación: China Pais de publicación: Países Bajos