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Characteristics of the delta N-15(NO3) distribution and its drivers in the Changjiang River estuary and adjacent waters
Wang Wentao1,2,3; Yu Zhiming1,2; Song Xiuxian1,2; Wu Zaixing1,2; Yuan Yongquan1,2; Zhou Peng1,2,3; Cao Xihua1,2
2017-03-01
Source PublicationCHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
Volume35Issue:2Pages:367-382
SubtypeArticle
AbstractIn this study, we conducted investigations in the Changjiang (Yangtze) River estuary and adjacent waters (CREAW) in June and November of 2014. We collected water samples from different depths to analyze the nitrogen isotopic compositions of nitrate, nutrient concentrations (including inorganic N, P, and Si), and other physical and biological parameters, along with the vertical distribution and seasonal variations of these parameters. The compositions of nitrogen isotope in nitrate were measured with the denitrifier method. Results show that the Changjiang River diluted water (CDW) was the main factor affecting the shallow waters (above 10 m) of the CREAW, and CDW tended to influence the northern areas in June and the southern areas in November. delta N-15(NO3) values in CDW ranged from 3.21%-3.55%. In contrast, the deep waters (below 30 m) were affected by the subsurface water of the Kuroshio Current, which intruded into the waters near 31 degrees N in June. The delta N-15(NO3) values of these waters were 6.03%-7.6%, slightly higher than the values of the Kuroshio Current. Nitrate assimilation by phytoplankton in the shallow waters of the study area varied seasonally. Because of the favorable temperature and nutrient conditions in June, abundant phytoplankton growth resulted in harmful algae blooms (HABs). Therefore, nitrate assimilation was strong in June and weak in November. The delta N-15(NO3) fractionations caused by assimilation of phytoplankton were 4.57% and 4.41% in the shallow waters in June and November, respectively. These results are consistent with previous laboratory cultures and in situ investigations. Nitrification processes were observed in some deep waters of the study area, and they were more apparent in November than in June. The fractionation values of nitrifi cation ranged from 24%-25%, which agrees with results for Nitrosospira tenuis reported by previous studies.
KeywordChangjiang River Estuary Nitrate Nitrogen Isotope Assimilation Nitrification
DOI10.1007/s00343-016-5276-x
Indexed BySCI
Language英语
WOS IDWOS:000396021400015
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/136769
Collection海洋生态与环境科学重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author Affilication中国科学院海洋研究所
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GB/T 7714
Wang Wentao,Yu Zhiming,Song Xiuxian,et al. Characteristics of the delta N-15(NO3) distribution and its drivers in the Changjiang River estuary and adjacent waters[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2017,35(2):367-382.
APA Wang Wentao.,Yu Zhiming.,Song Xiuxian.,Wu Zaixing.,Yuan Yongquan.,...&Cao Xihua.(2017).Characteristics of the delta N-15(NO3) distribution and its drivers in the Changjiang River estuary and adjacent waters.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,35(2),367-382.
MLA Wang Wentao,et al."Characteristics of the delta N-15(NO3) distribution and its drivers in the Changjiang River estuary and adjacent waters".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 35.2(2017):367-382.
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