Seasonal Sources and Cycling of Nitrogen Revealed by Stable Isotopes in the Northeastern Beibu Gulf, China
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area and Sampling
2.2. Chemical Analysis
2.3. Mixing Model
2.4. Quantification of the Mixing Model
3. Results
3.1. Chemical Parameters
3.2. Isotopic Composition
4. Discussion
4.1. Hydrographic Characteristics
4.2. Nutrient Sources in the Nearshore Area
4.3. Nitrate Biogeochemical Process in the Offshore Area
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Station | Salinity | PO43− [μmol L−1] | NH4+ [μmol L−1] | NO2− [μmol L−1] | NO3− [μmol L−1] | δ15N-NO3− [‰] | δ18O-NO3− [‰] |
---|---|---|---|---|---|---|---|
BH01 | 27.98 | 0.07 | 2.4 | 1.2 | 11.7 | 12.9 | 14.8 |
BH20 | 31.45 | 0.05 | 0.6 | 0.3 | 0.9 | 8.5 | 15.9 |
δ15N-NO3− | δ18O-NO3− | |||||
---|---|---|---|---|---|---|
Source | Range | Average ± SD | Reference | Range | Average ± SD | Reference |
Soil N | −0.05–8.25 | 4.52 ± 2.67 | [20,26] | −5–15 | 4.08 ± 0.33 | [20,26] |
M&S | 6.89–18.88 | 12.73 ± 3.4 | [20,26] | −5–15 | 4.08 ± 0.33 | [20,26] |
NF | −1.87–2.96 | 0.04 ± 1.87 | [20,26] | −5–15 | 4.08 ± 0.33 | [20,26] |
NP | −1.8– 4.1 | 0.8 ± 1.5 | [60] | 42.7–61.6 | 52.4 ± 5.1 | [60] |
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Lao, Q.; Liu, G.; Gao, J.; Shen, Y.; Su, Q.; Chen, C.; Chen, F. Seasonal Sources and Cycling of Nitrogen Revealed by Stable Isotopes in the Northeastern Beibu Gulf, China. J. Mar. Sci. Eng. 2021, 9, 1123. https://doi.org/10.3390/jmse9101123
Lao Q, Liu G, Gao J, Shen Y, Su Q, Chen C, Chen F. Seasonal Sources and Cycling of Nitrogen Revealed by Stable Isotopes in the Northeastern Beibu Gulf, China. Journal of Marine Science and Engineering. 2021; 9(10):1123. https://doi.org/10.3390/jmse9101123
Chicago/Turabian StyleLao, Qibin, Guoqiang Liu, Jingsong Gao, Youli Shen, Qizhong Su, Chunqing Chen, and Fajin Chen. 2021. "Seasonal Sources and Cycling of Nitrogen Revealed by Stable Isotopes in the Northeastern Beibu Gulf, China" Journal of Marine Science and Engineering 9, no. 10: 1123. https://doi.org/10.3390/jmse9101123
APA StyleLao, Q., Liu, G., Gao, J., Shen, Y., Su, Q., Chen, C., & Chen, F. (2021). Seasonal Sources and Cycling of Nitrogen Revealed by Stable Isotopes in the Northeastern Beibu Gulf, China. Journal of Marine Science and Engineering, 9(10), 1123. https://doi.org/10.3390/jmse9101123