| Sources and distributions of terrigenous organic matter in a mangrove fringed small tropical estuary in South China |
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| 作者姓名： | BAO Hongyan WU Ying TIAN Lixin ZHANG Jing ZHANG Guiling |
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| 作者单位： | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China;Key Laboratory ofMarine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China |
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| 基金项目： | the International Collaborative Program of China under contract No. 2007DFB20380 (Sino-Germany LANCET Program); the National Natural Science Foundation of China under contract Nos 41021064 and 41076052. |
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| 摘 要： | The sources and distributions of terrigenous organic matter (OM) were investigated in a small tropical estuary in the Hainan Island, South China. Plants, suspended particulate matter (SPM), and surface sediments samples in the estuary and coast were collected. Bulk properties organic carbon (OC%), total nitrogen (TN%), stable carbon isotope (δ13C) and grain size] and lignin phenol concentrations were measured. OC% of mangrove plants was (43.4 ± 2.1)%, which is similar to the values reported for mangrove plants in other regions. OC% of sediment samples ranged from 0.07% to 1.42%, and they were related to the sediment texture. Lignin phenols in the sediment ranged from 5.16 mg/100 mg OC in the uppermost station to 0.51mg/100mg OC in the coast. The molar ratio of organic carbon to total nitrogen (C/N) (～7) and δ 13 C (～-31.1×10-3 ) of riverine SPM revealed that the major OM sources of riverine SPM were aquatic OM (phytoplankton and/or bacteria). Moreover, the lower lignin concentration (Λ8) and higher (Ad/Al)v of lignin phenols suggest that terrestrial OM in riverine SPM were mainly from soil. Furthermore, C/N ratio, δ13C and lignin phenols reveal that mangrove plants were the predominant OM sources of mangrove surface sediment. Based on the δ13C and lignin phenols, it can be concluded that the major OM sources in estuarine and coastal surface sediments were marine phytoplankton, riverine SPM and mangrove surface sediment. In addition, the higher (Ad/Al)v of lignin phenols in those coastal sediments indicate that seagrass might be a potential OM source in coastal sediments, however, the lower (Ad/Al)v in the estuarine sediments in turn suggests that seagrass could not be transported to the mangrove fringed region. A three-end-member model which is based on lignin concentrations and δ13C was applied to evaluate the contribution of mangroves to the organic matter preserved in the surface sediments. Around the mangrove fringed region, mangrove could contribute more than 50% to the sedimentary OM, and this value is much higher than riverine OM. Nevertheless, mangrove OM could not be efficiently transported to the coastal region. Our study suggests that mangrove forest is an important OM source in this small estuary.
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| 关 键 词： | mangrove lignin phenols carbon isotope organic matter small river |
| 收稿时间： | 2011/11/19 0:00:00 |
| 修稿时间： | 2012/8/21 0:00:00 |
Sources and distributions of terrigenous organic matter in a mangrove fringed small tropical estuary in South China |
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| BAO Hongyan,WU Ying,TIAN Lixin,ZHANG Jing,ZHANG Guiling.Sources and distributions of terrigenous organic matter in a mangrove fringed small tropical estuary in South China[J].Acta Oceanologica Sinica,2013,32(4):18-26. |
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| Authors: | BAO Hongyan WU Ying TIAN Lixin ZHANG Jing and ZHANG Guiling |
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| Institution: | 1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China2.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China |
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| Abstract: | The sources and distributions of terrigenous organic matter (OM) were investigated in a small tropical estuary in the Hainan Island, South China. Plants, suspended particulate matter (SPM), and surface sediments samples in the estuary and coast were collected. Bulk properties organic carbon (OC%), total nitrogen (TN%), stable carbon isotope (δ13C) and grain size] and lignin phenol concentrations were measured. OC% of mangrove plants was (43.4±2.1)%, which is similar to the values reported for mangrove plants in other regions. OC% of sediment samples ranged from 0.07% to 1.42%, and they were related to the sediment texture. Lignin phenols in the sediment ranged from 5.16 mg/100 mg OC in the uppermost station to 0.51 mg/100 mg OC in the coast. The molar ratio of organic carbon to total nitrogen (C/N) (~7) and δ13C (~-31.1×10-3) of riverine SPM revealed that the major OM sources of riverine SPM were aquatic OM (phytoplankton and/or bacteria). Moreover, the lower lignin concentration (Λ8) and higher (Ad/Al)v of lignin phenols suggest that terrestrial OM in riverine SPM were mainly from soil. Furthermore, C/N ratio, δ13C and lignin phenols reveal that mangrove plants were the predominant OM sources of mangrove surface sediment. Based on the δ13C and lignin phenols, it can be concluded that the major OM sources in estuarine and coastal surface sediments were marine phytoplankton, riverine SPM and mangrove surface sediment. In addition, the higher (Ad/Al)v of lignin phenols in those coastal sediments indicate that seagrass might be a potential OM source in coastal sediments, however, the lower (Ad/Al)v in the estuarine sediments in turn suggests that seagrass could not be transported to the mangrove fringed region. A three-end-member model which is based on lignin concentrations and δ13C was applied to evaluate the contribution of mangroves to the organic matter preserved in the surface sediments. Around the mangrove fringed region, mangrove could contribute more than 50% to the sedimentary OM, and this value is much higher than riverine OM. Nevertheless, mangrove OM could not be efficiently transported to the coastal region. Our study suggests that mangrove forest is an important OM source in this small estuary. |
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| Keywords: | mangrove|lignin phenols|carbon isotope|organicmatter|small river |
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