于2009年对广东省3个典型海湾湛江港、深圳湾和流沙湾表层沉积物的稳定碳同位素进行了分析。结果显示, 湛江港表层沉积物δ13C值的范围为?25.9‰—?23.9‰, 平均值为?25.2‰；深圳湾表层沉积物的δ13C值的范围为?25.9‰—?23.2‰, 平均值为?25.1‰；流沙湾表层沉积物的δ13C值的范围为?23.2‰—?20.0‰, 平均值为?20.9‰。根据经典二元模式计算, 湛江港陆源有机质的贡献比例范围为0.57—0.90, 平均为0.78；深圳湾陆源有机质的贡献比例范围为0.45—0.90, 平均为0.76；而流沙湾表层沉积有机质中海洋有机质的贡献比例较大, 陆源有机质的贡献比例很小。湛江港和深圳湾表层沉积有机质主要来源于陆架, 可能是C3(光合作用最初产物为三碳化合物)植物和海洋浮游微藻的混合有机质, 但起主导作用的是陆架C3植物；而流沙湾表层沉积有机质主要来源于大型海藻和贝类的排泄物。各海湾沉积有机质的分布没有明显的规律性, 主要受大陆径流、航运和潮汐的影响, 同时也受海域初级生产力和水产养殖业的影响。
The authors investigated stable carbon isotopes of surface sediments from three typical bays in Guangdong Province, namely, Zhanjiang Bay, Shenzhen Bay and Liusha Bay, collected in 2009. The results showed that the δ13C values in the surface sediments from Zhanjiang Bay ranged from ?25.9 to ?23.9‰ with an average of ?25.2‰; those from Shenzhen Bay were from ?25.9 to ?23.2‰ with an average of ?25.1‰; and the those from Liusha Bay were from ?23.2 to ?20.0‰ with an average of ?20.9‰. Based on the classic binary mode, the proportion of terrestrial organic matter was in a range of 0.57?0.90 with an average of 0.78 in Zhanjing Bay, was in a range of 0.45?0.90 with an average of 0.76 in Shenzhen Bay, while that in Liusha Bay was small, and the proportion of its marine organic matter was high. The organic matters in the surface sediments of Zhanjiang Bay and Shenzhen Bay were mainly originated from the continental shelf, including the mixed organic matters from C3 plants and from marine planktonic microalgae, with the C3 plants playing the leading role. However, the organic matters in the surface sediments of Liusha Bay were almost all originated from macroalgae and shellfish’s excreta. Their distributions showed no obvious regularity, which was mainly affected by continental runoff, shipping and tides, as well as by the primary productivity in the sea water and aquaculture.
[1] 陈志华, 石学法, 蔡德陵, 等. 北冰洋西部沉积物有机碳、氮同位素特征及其环境指示意义[J]. 海洋学报, 2006, 28(6): 62?71.
[2] 张美, 孙晓明, 薛婷, 等. 太平洋海底富钴结壳中的烃类有机质及其成因意义[J]. 岩石学报, 2007, 23(11): 3026 ?3036.
[3] CHEN ZHIHUA, SHI XUEFA, CAI DELING, et al. Organic carbon and nitrogen isotopes in surface sediments from the western Arctic Ocean and their implications for sedimentary environments [J]. Acta Oceanologica Sinica, 2006, 25(5): 39?54.
[4] OLEARY M H. Carbon isotopes in photosynthesis [J]. Bioscience, 1988, 38: 328?336.
[5] 黄小平, 黄良民. 中国南海海草研究[M]. 广州: 广东经济出版社, 2007: 1?92.
[6] 谢恩义, 申玉春, 叶宁, 等. 流沙湾的底栖大型海藻调查[J]. 广东海洋大学学报, 2009, 29 (4): 30?35.
[7] 中华人民共和国国家标准. 海洋监测规范: 第5部分: 沉积物分析[S]. 北京: 中国标准出版社, 2007: 1?56.
[8] 张凌, 陈繁荣, 杨永强, 等. 珠江口及近海沉积有机质来源判断[J]. 海洋环境科学, 2008, 27 (5): 447?451.
[9] SCHULZ H D, AZBEL M. Marine geochemistry [M]. Berlin: Springer-Verlag, 2000: 129?334.
[10] CRAIG H. The geochemistry of the stable carbon isotopes [J]. Geochemistry Cosmochim Acta, 1953, 3: 53?92.
[11] MINOURA K, HOSHINO K, NAKAMURA T, et al. Late Pleistocene-Holocene paleoproductivity circulation in the Japan Sea: Sea-level control on δ13C and δ15N records of sediment organic material [J]. Palaeogeography, Palaeoclimatology, Palaeoecology, 1997, 135: 41?50.
[12] JIA GUODONG, PENG PINGAN. Temporal and spatial variations in signatures of sediment organic matter in Lingding Bay (Peal Estuary), southern China [J]. Marine Chemistry, 2003, 82: 47?54.
[13] CURRIN C A, NEWELL S Y, PAERL H W. The role of standing dead Spartina alterni?ora and benthic microalgae in salt-marsh food webs: Considerations based on multiple stable isotope analysis[J]. Marine Ecology Progress Series, 1995, 121: 99-116.
[14] 胡建芳, 彭平安, 麦碧娴, 等. 珠江口不同沉积有机质的来源及相对含量[J]. 热带海洋学报, 2005, 24 (1): 15?20.
[15] GRACE V B, LUIZ A M, THEREZINHA M. Stable isotopes of bulk organic matter to trace carbon and nitrogen dynamics in an estuarine ecosystem in Babitonga Bay[J]. Science of the Total Environment, 2010, 408: 2226?2232.
[16] 李宏亮, 陈建芳, 金海燕, 等. 楚科奇海表层沉积物的生源组分及其对碳埋藏的指示意义[J]. 海洋学报, 2008, 30(1): 165?171.
[17] 张凌, 陈繁荣, 殷克东,等. 珠江口及近海表层沉积有机质的特征和来源[J]. 热带海洋学报, 2010, 29(1): 98?103.
[18] 章伟艳, 金海燕, 张富元, 等. 长江口-杭州湾及其邻近海域不同粒级沉积有机碳分布特征[J]. 地球科学进展, 2009, 24(11): 1202?1209.
[19] 蔡德陵, 石学法, 周卫健, 等. 南黄海悬浮体和沉积物的物质来源和运移: 来自碳稳定同位素组成的证据[J]. 科学通报, 2001, 46(增刊): 16?23.
