Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China
In this study, the isotopic composition (δ<sup>13</sup>C and δ<sup>15</sup>N), total organic carbon content, total nitrogen content, and C/N ratios of suspended particulate organic matter (POM) in Zhanjiang Bay, which is a semi-enclosed bay with concentrated artificial activi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/9/5/541 |
| _version_ | 1797533825983578112 |
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| author | Jiacheng Li Fajin Chen Shuwen Zhang Chao Huang Chunqing Chen Fengxia Zhou Junhui Wu Guangzhe Jin Qingmei Zhu |
| author_facet | Jiacheng Li Fajin Chen Shuwen Zhang Chao Huang Chunqing Chen Fengxia Zhou Junhui Wu Guangzhe Jin Qingmei Zhu |
| author_sort | Jiacheng Li |
| collection | DOAJ |
| description | In this study, the isotopic composition (δ<sup>13</sup>C and δ<sup>15</sup>N), total organic carbon content, total nitrogen content, and C/N ratios of suspended particulate organic matter (POM) in Zhanjiang Bay, which is a semi-enclosed bay with concentrated artificial activities in Southern China, were analyzed in order to investigate the seasonal variations in the principal POM sources in the monsoon region. In summer, the δ<sup>13</sup>C and δ<sup>15</sup>N values showed a weak correlation with the chlorophyll a (<i>Chl a</i>), suggesting that terrigenous sources were dominant. However, in winter, the particulate organic carbon and particulate nitrogen values were correlated with the <i>Chl a</i> in the middle bay and bay mouth. Moreover, the δ<sup>13</sup>C values showed a significant correlation with <i>Chl a</i> during the winter, indicating that the contribution of the in situ phytoplankton was relatively important and was affected by the monsoon in winter. Compared with the corresponding δ<sup>13</sup>C values, the δ<sup>15</sup>N values exhibited a complex spatial distribution. By using a Bayesian mixing model, in the upper bay, the source of POM was mainly from marine organic matter (49%) in summer, and almost an equilibrated contribution of all sources in winter. In the middle bay and bay mouth, the POM contribution mainly originated from marine organic matter (53%) during the winter. In contrast, the POM source was mainly soil organic matter (63%) in summer, suggesting that the POM was sourced from the runoff from the upstream basin. Our results suggest that the seasonal shifts of the source of POM should be taken into account when estimating C or N mass balance in the monsoon-controlled bay. |
| first_indexed | 2024-03-10T11:20:08Z |
| format | Article |
| id | doaj.art-89923fb77f59422ba51528b8eb94b6f4 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T11:20:08Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-89923fb77f59422ba51528b8eb94b6f42023-11-21T20:05:39ZengMDPI AGJournal of Marine Science and Engineering2077-13122021-05-019554110.3390/jmse9050541Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern ChinaJiacheng Li0Fajin Chen1Shuwen Zhang2Chao Huang3Chunqing Chen4Fengxia Zhou5Junhui Wu6Guangzhe Jin7Qingmei Zhu8Institute of Marine Science, Shantou University, Shantou 515063, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, ChinaInstitute of Marine Science, Shantou University, Shantou 515063, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, ChinaIn this study, the isotopic composition (δ<sup>13</sup>C and δ<sup>15</sup>N), total organic carbon content, total nitrogen content, and C/N ratios of suspended particulate organic matter (POM) in Zhanjiang Bay, which is a semi-enclosed bay with concentrated artificial activities in Southern China, were analyzed in order to investigate the seasonal variations in the principal POM sources in the monsoon region. In summer, the δ<sup>13</sup>C and δ<sup>15</sup>N values showed a weak correlation with the chlorophyll a (<i>Chl a</i>), suggesting that terrigenous sources were dominant. However, in winter, the particulate organic carbon and particulate nitrogen values were correlated with the <i>Chl a</i> in the middle bay and bay mouth. Moreover, the δ<sup>13</sup>C values showed a significant correlation with <i>Chl a</i> during the winter, indicating that the contribution of the in situ phytoplankton was relatively important and was affected by the monsoon in winter. Compared with the corresponding δ<sup>13</sup>C values, the δ<sup>15</sup>N values exhibited a complex spatial distribution. By using a Bayesian mixing model, in the upper bay, the source of POM was mainly from marine organic matter (49%) in summer, and almost an equilibrated contribution of all sources in winter. In the middle bay and bay mouth, the POM contribution mainly originated from marine organic matter (53%) during the winter. In contrast, the POM source was mainly soil organic matter (63%) in summer, suggesting that the POM was sourced from the runoff from the upstream basin. Our results suggest that the seasonal shifts of the source of POM should be taken into account when estimating C or N mass balance in the monsoon-controlled bay.https://www.mdpi.com/2077-1312/9/5/541particulate organic matterstable isotopesC/N ratioisotope mixing modelZhanjiang Bay |
| spellingShingle | Jiacheng Li Fajin Chen Shuwen Zhang Chao Huang Chunqing Chen Fengxia Zhou Junhui Wu Guangzhe Jin Qingmei Zhu Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China Journal of Marine Science and Engineering particulate organic matter stable isotopes C/N ratio isotope mixing model Zhanjiang Bay |
| title | Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China |
| title_full | Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China |
| title_fullStr | Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China |
| title_full_unstemmed | Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China |
| title_short | Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China |
| title_sort | origin of the particulate organic matter in a monsoon controlled bay in southern china |
| topic | particulate organic matter stable isotopes C/N ratio isotope mixing model Zhanjiang Bay |
| url | https://www.mdpi.com/2077-1312/9/5/541 |
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