Sources and transformations of nitrogen in an agricultural watershed on the Jianghan Plain, China: an integration of δ15N–NH4+, δ15N–NO3-, δ18O–NO3- and a Bayesian isotope mixing model

Due to the complexity of nitrate sources and transformation processes under extensive human activities and climate change, there are a great number of uncertainties associated with ascertaining nitrogen sources and transformations in agricultural watersheds. In this study, multiple isotopes of ammon...

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Published in:Applied geochemistry 2022-07, Vol.142, p.105329, Article 105329
Main Authors: Cao, Mingda, Yin, Xijie, Zhang, Jie, Jin, Menggui, Huang, Xin
Format: Article
Language:English
Subjects:
Ammonium
Isotope
Nitrate
Quanshui river watershed
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Summary:Due to the complexity of nitrate sources and transformation processes under extensive human activities and climate change, there are a great number of uncertainties associated with ascertaining nitrogen sources and transformations in agricultural watersheds. In this study, multiple isotopes of ammonium (δ15N–NH4+), nitrate (δ15N–NO3-, δ18O–NO3-), water (δ18O–H2O) and hydrogeochemical data were integrated to identify nitrogen sources and elucidate the mechanisms of nitrogen transformation in the Quanshui River watershed, a typical agricultural watershed in central China. The characteristics of nitrate nitrogen and oxygen isotopes, lower δ15N–NO3- values (
ISSN:0883-2927
1872-9134
DOI:10.1016/j.apgeochem.2022.105329