Key nitrogen biogeochemical processes revealed by the nitrogen isotopic composition of dissolved nitrate in the Changjiang River estuary, China

Haiyan Yu; Zhiming Yu; Xiuxian Song; Xihua Cao; Yongquan Yuan; Guangyuan Lu; Lili Liu

doi:10.1007/s00343-014-3102-x

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Key nitrogen biogeochemical processes revealed by the nitrogen isotopic composition of dissolved nitrate in the Changjiang River estuary, China

Updated：2023-05-16

- Key nitrogen biogeochemical processes revealed by the nitrogen isotopic composition of dissolved nitrate in the Changjiang River estuary, China
- Journal of Oceanology and Limnology Vol. 32, Issue 1, Pages: 162-173(2014)
- Affiliations：
  
  1. Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences
  2. University of Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-014-3102-x
  CLC：
- Online First：21 February 2014，
  
  Published：2014
- Accepted：
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Yu, H., Yu, Z., Song, X. et al. Key nitrogen biogeochemical processes revealed by the nitrogen isotopic composition of dissolved nitrate in the Changjiang River estuary, China., Chin. J. Ocean. Limnol. 32, 162–173 (2014). https://doi.org/10.1007/s00343-014-3102-x
DOI：

Yu, H., Yu, Z., Song, X. et al. Key nitrogen biogeochemical processes revealed by the nitrogen isotopic composition of dissolved nitrate in the Changjiang River estuary, China., Chin. J. Ocean. Limnol. 32, 162–173 (2014). https://doi.org/10.1007/s00343-014-3102-x DOI：

摘要

Abstract

Seasonal variations in the nitrogen isotopic composition of dissolved nitrate (δ15NO3) were investigated in the surface waters of the Changjiang River estuary in 2009 and 2010. δ15NO3 varied between −4.6‰ and 8.9‰ with changes in temperature

salinity

dissolved oxygen concentrations

and the composition of the dissolved inorganic nitrogen pool. In February

biological processes decreased because of low temperature

and the mean δ15NO3 near the river mouth was 2.4‰. In May

δ15NO3 was the highest in the surface waters among all seasons. Analysis on the conservative mixing revealed assimilation

and this finding is supported by positive relationship between Chl a and δ15NO3. The fractionation factor of assimilation was estimated to be 2.0‰ by the Rayleigh equation. Nitrification was supported based on the mixing behaviors in November 2010 and the low δ15NO3 values in May and November 2009. The high ammonium concentrations in the adjacent marine area and positive relationships between total organic nitrogen and δ15NO3 in November 2010 indicated that mineralization was taking place.

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references

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