Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf
Both dissolved and particulate organic matters (DOM and POM) provide a reduced carbon pool of considerable size in coastal ecosystems, and the two are closely linked. Currently, however, the integrated study of DOM and POM remains limited, precluding a more in-depth understanding of their interactio...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-04-01
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| Series: | Frontiers in Marine Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2023.1163899/full |
| _version_ | 1797845020589424640 |
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| author | Shangjun Cai Chao Wang Chao Wang Chao Wang Chao Wang Qingmei Zhu Qingmei Zhu Qingmei Zhu Qibin Lao |
| author_facet | Shangjun Cai Chao Wang Chao Wang Chao Wang Chao Wang Qingmei Zhu Qingmei Zhu Qingmei Zhu Qibin Lao |
| author_sort | Shangjun Cai |
| collection | DOAJ |
| description | Both dissolved and particulate organic matters (DOM and POM) provide a reduced carbon pool of considerable size in coastal ecosystems, and the two are closely linked. Currently, however, the integrated study of DOM and POM remains limited, precluding a more in-depth understanding of their interaction in coastal regions. In April 2021, 13 surface water samples were collected from Qinzhou Bay, in the northern Beibu Gulf. The DOM samples were characterized using dissolved organic carbon (DOC) analysis and UV-visible and fluorescence spectroscopy techniques. We determined the POM for the particulate organic carbon and nitrogen (POC and PN) and also isotopic composition (δ13C and δ15N). The weak to negligible relationships found between the DOC, colored and fluorescent DOM, salinity, and chlorophyll a together suggested that DOM’s distribution in Qinzhou Bay is concurrently shaped by various processes, namely, hydrological and in situ biological processes. A high C/N ratio of ~17, high POC/chlorophyll a ratio (253 ± 112), and depleted δ13C (−25.7 ± 1.6‰) confirmed that POM is highly degraded and originates mainly from allochthonous input, to which the terrigenous organic matter and freshwater phytoplankton each contributes 35%. The total organic carbon (TOC = DOC + POC) was positively correlated with the humic-like peak M, revealing the transformation of labile DOM and POM into recalcitrant DOM components. The in situ production efficiency of peak M in surface waters of Qinzhou Bay is one order of magnitude greater than that in inland waters or open oceans, indicating that not only temperature but also the activity of substrate is a key factor controlling the in situ production of recalcitrant DOM in Qinzhou Bay. High levels of TOC and humic-like fluorescent DOM suggest the mass coexistence of organic matter differing in its reactivity, highlighting the large potential for photochemical as well as microbial degradation in the future. |
| first_indexed | 2024-04-09T17:31:49Z |
| format | Article |
| id | doaj.art-bc382a6e9bb748bebfcd5755948cef0c |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-09T17:31:49Z |
| publishDate | 2023-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-bc382a6e9bb748bebfcd5755948cef0c2023-04-18T05:18:49ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452023-04-011010.3389/fmars.2023.11638991163899Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu GulfShangjun Cai0Chao Wang1Chao Wang2Chao Wang3Chao Wang4Qingmei Zhu5Qingmei Zhu6Qingmei Zhu7Qibin Lao8College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, ChinaLaboratory for Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, ChinaKey Laboratory of Climate, Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong Province, Guangdong Ocean University, Zhanjiang, ChinaKey Laboratory of Space Ocean Remote Sensing and Application, Ministry of Natural Resources, Beijing, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, ChinaLaboratory for Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, ChinaKey Laboratory of Climate, Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong Province, Guangdong Ocean University, Zhanjiang, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, ChinaBoth dissolved and particulate organic matters (DOM and POM) provide a reduced carbon pool of considerable size in coastal ecosystems, and the two are closely linked. Currently, however, the integrated study of DOM and POM remains limited, precluding a more in-depth understanding of their interaction in coastal regions. In April 2021, 13 surface water samples were collected from Qinzhou Bay, in the northern Beibu Gulf. The DOM samples were characterized using dissolved organic carbon (DOC) analysis and UV-visible and fluorescence spectroscopy techniques. We determined the POM for the particulate organic carbon and nitrogen (POC and PN) and also isotopic composition (δ13C and δ15N). The weak to negligible relationships found between the DOC, colored and fluorescent DOM, salinity, and chlorophyll a together suggested that DOM’s distribution in Qinzhou Bay is concurrently shaped by various processes, namely, hydrological and in situ biological processes. A high C/N ratio of ~17, high POC/chlorophyll a ratio (253 ± 112), and depleted δ13C (−25.7 ± 1.6‰) confirmed that POM is highly degraded and originates mainly from allochthonous input, to which the terrigenous organic matter and freshwater phytoplankton each contributes 35%. The total organic carbon (TOC = DOC + POC) was positively correlated with the humic-like peak M, revealing the transformation of labile DOM and POM into recalcitrant DOM components. The in situ production efficiency of peak M in surface waters of Qinzhou Bay is one order of magnitude greater than that in inland waters or open oceans, indicating that not only temperature but also the activity of substrate is a key factor controlling the in situ production of recalcitrant DOM in Qinzhou Bay. High levels of TOC and humic-like fluorescent DOM suggest the mass coexistence of organic matter differing in its reactivity, highlighting the large potential for photochemical as well as microbial degradation in the future.https://www.frontiersin.org/articles/10.3389/fmars.2023.1163899/fullQinzhou bayBeibu Gulfdissolved organic matterparticulate organic matterabsorption and fluorescence spectraδ13C and δ15N |
| spellingShingle | Shangjun Cai Chao Wang Chao Wang Chao Wang Chao Wang Qingmei Zhu Qingmei Zhu Qingmei Zhu Qibin Lao Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf Frontiers in Marine Science Qinzhou bay Beibu Gulf dissolved organic matter particulate organic matter absorption and fluorescence spectra δ13C and δ15N |
| title | Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf |
| title_full | Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf |
| title_fullStr | Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf |
| title_full_unstemmed | Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf |
| title_short | Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf |
| title_sort | source distribution and transformation of dissolved and particulate organic matters in qinzhou bay northern beibu gulf |
| topic | Qinzhou bay Beibu Gulf dissolved organic matter particulate organic matter absorption and fluorescence spectra δ13C and δ15N |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2023.1163899/full |
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