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Responses of coastal sediment phosphorus release to elevated urea loading

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  • Shuo Nan Ma, Ningbo University
  • ,
  • Xu Meng Dong, Ningbo University
  • ,
  • Erik Jeppesen
  • Martin Søndergaard
  • Jia Yi Cao, Ningbo University
  • ,
  • Yuan Yuan Li, Yunnan University
  • ,
  • Hai Jun Wang, Yunnan University
  • ,
  • Ji Lin Xu, Ningbo University

Increased urea is one of the common nitrogen forms polluting coastal waters and affecting nutrient dynamics. To investigate the effects of urea on sediment phosphorus (P) release, we carried out a 2-month mesocosm experiment with six targeted loadings of urea (0–0.6 mg N L−1 d−1). Results showed that: i) urea was rapidly transformed into ammonium and then nitrate (NO3). ii) When nitrogen occurred as urea or ammonium, minor P release was observed. iii) After urea were mostly converted to NO3, P release became clearer. iv) NO3 had a dual effect by promoting P release through decreasing sediment pH and increasing alkaline phosphatase activity or by inhibiting P release through improving sediment oxidation. v) The overall effects of urea on P release depended on the ultimate NO3 concentrations, being prominent when NO3 ≥ 11 mg N L−1. Our findings are of relevance when determining nitrogen reduction targets needed for combating eutrophication.

TidsskriftMarine Pollution Bulletin
Antal sider10
StatusUdgivet - jan. 2022

Bibliografisk note

Funding Information:
The research was supported by National Key Research and Development Program of China ( 2019YFD0900403-03 ), Zhejiang Basic Public Welfare Research Program ( LQ21C030005 ), Yunnan Provincial Department of Science and Technology ( 202001BB050078 ), National Natural Science Foundation of China ( 42107399 ), and Ningbo Public Welfare Science and Technology Program ( 2021S060 ). We thank Anne Mette Poulsen for valuable editing of the paper.

Publisher Copyright:
© 2021

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