Determination sources of nitrates into the Three Gorges Reservoir using nitrogen and oxygen isotopes
作者： Yunyun Zhao , Binghui Zheng , Haifeng Jia , Zhengxia Chen
DOI: 10.1016/J.SCITOTENV.2019.06.073
关键词:
摘要: Abstract Identification of nitrate sources and its transformations are important for the management large lakes reservoirs. The Three Gorges Reservoir (TGR) in China is one largest reservoirs around world. In this study, stable isotopes nitrogen (δ15N–NO3−) oxygen (δ18O–NO3−) water were used to gain insights into tail area TGR. Bayesian mixing model has been conducted estimate proportional contribute sources. modelling results indicated that NH4+ fertilizer (range 7–54%) soil organic 2–45%) dominant NO3−–N TGR during three season study period. Nitrification contributed a part river dry season. from solution riparian zone with denitrified NO3− might be another major reason enrichment δ15N–NO3− δ18O–NO3− normal Reducing use chemical fertilizers, especially protecting erosion may effective measures improve quality
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