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      Identifying nitrogen sources in intensive livestock farming watershed with swine excreta treatment facility using dual ammonium (δ15NNH4) and nitrate (δ15NNO3) nitrogen isotope ratios axes.

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          Abstract

          We proposed a novel approach based on dual ammonium and nitrate nitrogen isotope ratios (δ15NNH4 and δ15NNO3, respectively) axes to identify nitrogen sources in intensive livestock farming watersheds, especially those with swine excreta treatment facilities. The δ15NNH4 and δ15NNO3 values in water samples were measured monthly in 2016-2017. Soil and mineral fertilizers, sewage, sewage effluent, manure, and swine effluents were the five sources considered to identify nitrogen sources. The results showed that nitrogen pollution from agricultural activities was well reflected by the seasonal δ15NNH4 and δ15NNO3 patterns in the river, and microbial nitrification was suggested as the dominant nitrogen transformation process in the river. This study revealed that δ15NNH4 and δ15NNO3 axes provided better results than the traditionally used nitrate oxygen (δ18ONO3) and δ15NNO3 axes for identifying nitrogen sources in agricultural watersheds with swine excreta treatment facilities. The mixing model results showed that stream water was severely contaminated with swine effluents (e.g., a mean minimum contribution of 31%), thus affecting the quality of the mainstream (p = 0.068 < 0.10). This study was the first successful application of dual δ15NNH4 and δ15NNO3 axes to better understand nitrogen sources in intensive livestock farming watersheds with swine excreta treatment facilities.

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          Author and article information

          Journal
          Sci Total Environ
          The Science of the total environment
          Elsevier BV
          1879-1026
          0048-9697
          Jul 20 2021
          : 779
          Affiliations
          [1 ] Water Environment Research Department, National Institute of Environmental Research, Hwangyoung-ro 42, Seo-gu, Incheon 22689, Republic of Korea.
          [2 ] Water Environment Research Department, National Institute of Environmental Research, Hwangyoung-ro 42, Seo-gu, Incheon 22689, Republic of Korea. Electronic address: egchung@korea.kr.
          [3 ] Environment Measurement and Analysis Center, National Institute of Environmental Research (NIER), Hwangyoung-ro 42, Seo-gu, Incheon 22689, Republic of Korea.
          Article
          S0048-9697(21)01548-5
          10.1016/j.scitotenv.2021.146480
          34030231
          5dfb0b5b-855e-4311-bdc7-0ef25cf84f65
          History

          Ammonium nitrogen isotope ratios,Dual isotope approach,Nitrate nitrogen isotope ratios,Nitrogen sources

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