作者
Xiuli Yan, Xianhui Sean Wan, Li Liu, Min Nina Xu, Ehui Tan, Zhenzhen Zheng, Wenbin Zou, Li Tian, Da‐Wei Li, Thomas W Trull, Shuh‐Ji Kao
发表日期
2019/7
期刊
Journal of Geophysical Research: Biogeosciences
卷号
124
期号
7
页码范围
1849-1864
简介
Estuaries sit at the land‐ocean boundary and act as natural reactors for nitrogen (N) transformations among numerous forms. Superimposing onto physical mixing, biological processes lead to nonconservative N behavior in estuaries. Under the coinfluences of biological alteration and multiple end‐members, however, some N species can exhibit apparent conservation. To explore N dynamics and potential mechanisms that modulate the mixing behaviors, we measured concentrations and natural isotopic compositions of multiple N species (nitrate: NO3−, nitrite: NO2−, ammonium: NH4+, and particulate nitrogen) in a typical eutrophic estuary in southern China. Additionally, N uptake and oxidation rates were measured by using isotope labelling techniques to evaluate processes potentially offsetting the conservative mixing of specific N pools. We found that NO3− followed conservative two end‐member mixing with …
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