| XIA Bin,CUI Yi,CHEN Bijuan,CUI Zhengguo,QU Keming,MA Feifei. 2014. Carbon and nitrogen isotopes analysis and sources of organic matter in surface sediments from the Sanggou Bay and its adjacent areas, China. Acta Oceanologica Sinica, 33(12):48－57 |
| Carbon and nitrogen isotopes analysis and sources of organic matter in surface sediments from the Sanggou Bay and its adjacent areas, China |
| 桑沟湾及附近海域表层沉积物碳氮同位素分析及有机质来源 |
| Received:December 19, 2013 Revised:July 08, 2014 |
| DOI：10.1007/s13131-014-0574-7 |
| Key words:carbon nitrogen stable isotopes organic matter sources sediment Sanggou Bay |
| 中文关键词: 碳 氮 稳定同位素 有机质 来源 沉积物 桑沟湾 |
| 基金项目:The Joint Fund Project of National Fund Committee and Shandong Province under contract No. U1406403; the State Oceanic Administration Project of China under contract Nos DOMEP (MEA)-01-01 and DOMEP (MEA)-02. |
| Author Name | Affiliation | E-mail | | XIA Bin | Key Laboratory of Sustainable Utilization of Marine Fisheries Resources of Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Qingdao 266071, China | xiabin@ysfri.ac.cn | | CUI Yi | Key Laboratory of Sustainable Utilization of Marine Fisheries Resources of Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Qingdao 266071, China | | | CHEN Bijuan | Key Laboratory of Sustainable Utilization of Marine Fisheries Resources of Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Qingdao 266071, China | | | CUI Zhengguo | Key Laboratory of Sustainable Utilization of Marine Fisheries Resources of Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Qingdao 266071, China | | | QU Keming | Key Laboratory of Sustainable Utilization of Marine Fisheries Resources of Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Qingdao 266071, China | | | MA Feifei | Key Laboratory of Sustainable Utilization of Marine Fisheries Resources of Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Qingdao 266071, China | |
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| Abstract: |
| Naturally existing stable carbon and nitrogen isotopes are important in the study of sedimentary organic matter sources. To identify the sources of sedimentary organic matter in Sanggou Bay and its adjacent areas, which is characterized by high-density shellfish and seaweed aquaculture, the grain size, organic carbon (OC), total nitrogen (TN), carbon and nitrogen isotopic composition (δ13C and δ15N) of organic matter in the surface sediment were determined. The results showed that, in August, sedimentary OC and TN ranged from 0.17% to 0.76% and 0.04% to 0.14%, respectively. In November, OC and TN ranged from 0.23% to 0.87% and 0.05% to 0.14%, respectively. There was a significant positive correlation between OC and TN (R=0.98, P<0.0001), indicating that OC and TN were homologous. In August, the δ13C and δ15N of organic matter varied from -23.06‰ to -21.59‰ and 5.10‰ to 6.31‰, respectively. In November, δ13C and δ15N ranged from -22.87‰ to -21.34‰ and 5.13‰ to 7.31‰, respectively. This study found that the major sources of sedimentary organic matter were marine shellfish biodeposition, seaweed farming, and soil organic matter. Using a three-end-member mixed model, we estimated that the dominant source of sedimentary organic matter was shellfish biodeposition, with an average contribution rate of 65.53% in August and 43.00% in November. Thus, shellfish farming had a significant influence on the coastal carbon cycle. |
| 中文摘要: |
| 天然存在的碳氮稳定同位素对于研究海洋沉积物有机质的来源具有非常重要的作用.本文于2012年8月和11月对桑沟湾养殖区及附近海域表层沉积物进行采样,分析了沉积物粒径以及有机碳、总氮、碳、氮同位素的分布特征,探讨了沉积物有机质的来源,并在此基础上估算了不同来源的贡献.结果表明,8月有机碳和总氮的含量范围分别是0.17%～0.76%和0.04%～0.14%;11月有机碳和总氮的含量范围是0.23%～0.87%和 0.05%～0.14%.OC%与TN%呈极显著的正相关(R=0.98,P<0.0001),表明沉积物有机碳和总氮具有同源性.8月有机质的δ13C和δ15N变化范围分别是-23.06‰～-21.59‰和5.10‰～6.31‰.11月有机质的δ13C和δ15N变化范围分别是-22.87‰～-21.34‰和5.13‰～7.31‰.有机质来源分析表明,贝类生物沉积、海藻养殖以及土壤有机质是沉积物有机质主要的三种来源.运用三元混合模型计算得出,8月和11月沉积物有机质主要来源是贝类生物沉积物,平均贡献率分别为65.53%和43.00%.所以,贝类养殖对近海碳循环具有显著影响. |
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