Key nitrogen biogeochemical processes revealed by the nitrogen isotopic composition of dissolved nitrate in the Changjiang River estuary, China
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%0 with changes in temperature, salinity, dissolved oxygen concentrations, and the compo...
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| Published in | Chinese journal of oceanology and limnology Vol. 32; no. 1; pp. 162 - 173 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Berlin/Heidelberg
Springer-Verlag
2014
Springer Berlin Heidelberg Springer Nature B.V |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0254-4059 2096-5508 1993-5005 2523-3521 |
| DOI | 10.1007/s00343-014-3102-x |
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| 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%0 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%0. 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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| AbstractList | 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. Seasonal variations in the nitrogen isotopic composition of dissolved nitrate ( delta super(15)NO sub(3)) were investigated in the surface waters of the Changjiang River estuary in 2009 and 2010. delta super(15)NO sub(3) varied between -4.6ppt and 8.9ppt 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 delta super(15)NO sub(3) near the river mouth was 2.4ppt. In May, delta super(15)NO sub(3) 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 delta super(15)NO sub(3). The fractionation factor of assimilation was estimated to be 2.0ppt by the Rayleigh equation. Nitrification was supported based on the mixing behaviors in November 2010 and the low delta super(15)NO sub(3) values in May and November 2009. The high ammonium concentrations in the adjacent marine area and positive relationships between total organic nitrogen and delta super(15)NO sub(3) in November 2010 indicated that mineralization was taking place. 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. 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%0 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%0. 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. Seasonal variations in the nitrogen isotopic composition of dissolved nitrate (δ 15 NO 3 ) were investigated in the surface waters of the Changjiang River estuary in 2009 and 2010. δ 15 NO 3 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 δ 15 NO 3 near the river mouth was 2.4‰. In May, δ 15 NO 3 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 δ 15 NO 3 . 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 δ 15 NO 3 values in May and November 2009. The high ammonium concentrations in the adjacent marine area and positive relationships between total organic nitrogen and δ 15 NO 3 in November 2010 indicated that mineralization was taking place. |
| Author | Cao, Xihua Lu, Guangyuan Liu, Lili Yu, Haiyan Song, Xiuxian Yuan, Yongquan Yu, Zhiming |
| AuthorAffiliation | Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences,Qingdao 266071, China University of Chinese Academy of Sciences, Beijing 100049, China |
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| CitedBy_id | crossref_primary_10_5564_bicct_v10i10_2604 crossref_primary_10_1016_j_scitotenv_2020_144674 crossref_primary_10_1016_j_jwpe_2024_105639 crossref_primary_10_1007_s11629_021_7301_6 crossref_primary_10_1007_s12237_023_01216_8 crossref_primary_10_1016_j_jhazmat_2023_132901 crossref_primary_10_1016_j_ecss_2015_01_017 crossref_primary_10_1038_s41598_018_35309_3 crossref_primary_10_1007_s00343_016_5276_x |
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| Keywords | mineralization eutrophication nitrification assimilation |
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| Notes | assimilation; nitrification; mineralization; eutrophication 37-1150/P YU Haiyan , YU Zhiming , SONG Xiuxian , CAO Xihua , YUAN Yongquan , LU Guangyuan , LIU Lili （1 Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 2 University of Chinese Academy of Sciences, Beijing 100049, China） 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%0 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%0. 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. http://dx.doi.org/10.1007/s00343-014-3102-x ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 |
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| Snippet | Seasonal variations in the nitrogen isotopic composition of dissolved nitrate （δ15NO3） were investigated in the surface waters of the Changjiang River estuary... Seasonal variations in the nitrogen isotopic composition of dissolved nitrate (δ¹⁵NO₃) were investigated in the surface waters of the Changjiang River estuary... Seasonal variations in the nitrogen isotopic composition of dissolved nitrate (δ 15 NO 3 ) were investigated in the surface waters of the Changjiang River... Seasonal variations in the nitrogen isotopic composition of dissolved nitrate (δ15NO3) were investigated in the surface waters of the Changjiang River estuary... Seasonal variations in the nitrogen isotopic composition of dissolved nitrate ( delta super(15)NO sub(3)) were investigated in the surface waters of the... |
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| SubjectTerms | Ammonium Ammonium compounds Assimilation Biogeochemistry Biological activity Biological assimilation Brackish Chemical composition Chemistry China dissolved inorganic nitrogen Dissolved oxygen Earth and Environmental Science Earth Sciences equations Estuaries Estuarine dynamics Fractionation Isotopes Low temperature Marine Marine environment Mineralization mixing Nitrates Nitrification Nitrogen Oceanography Organic nitrogen Rayleigh equations River mouth River mouths Rivers salinity Seasonal variation Seasonal variations Surface water temperature 中国 同位素组成 正相关关系 氮库 溶解氧浓度 生物地球化学过程 酸溶解 长江口 |
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| Title | Key nitrogen biogeochemical processes revealed by the nitrogen isotopic composition of dissolved nitrate in the Changjiang River estuary, China |
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