Source and Distribution of Organic Matter in Seabed Sediments of the Changjiang River Estuary and Its Adjacent Sea Area
Received date: 2007-06-09
Revised date: 2007-08-10
Online published: 2007-09-25
Supported by
National Basic Research Program of China, No.2002CB412401; National Natural Science Foundation of China, No.40506022; No.40506013
In this paper, 34 superficial sediment samples were collected in Changjiang River Estuary and its adjacent sea area. Subsequently, grain size, total organic carbon, total nitrogen, carbon and nitrogen isotope compositions were also analysized. Finally, organic carbon and nitrogen spatial distribution patterns in Changjiang River Estuary and its adjacent sea area were studied; characteristics of stable carbon and nitrogen isotope in seabed sediments and their implications for tracing organic matter source were discussed; and contributions of different organic matter sources in seabed sediment were calculated. The spatial distribution patterns of total organic carbon and total nitrogen show apparent correlation with currents of East China Sea shelf. Corresponding to distributions of these currents, the study area could be divided into four different parts. Total organic carbon, total nitrogen, and organic carbon and nitrogen stable isotope in sediments shows linear correlation with mean grain size, respectively, thus "grain size effect" is an important factor that influences their distributions. C/N ratio can reflect source information of organic matter to a certain degree. In contrast, nitrogen stable isotope shows different spatial distribution patterns with C/N and organic carbon stable isotope, according to their relationships and regional distributions. The highest contribution (more than 50%) of the terrestrial organic carbon appears near the Changjiang River Estuary, and their isolines project towards northeast, indicating the influence of Changjiang dilution water. The terrestrial particulate organic matter suffers from effects of diagenesis, benthos and incessant inputting of dead organic matter of plankton, after depositing in seabed. Therefore, the contribution of terrestrial organic carbon to particulate organic matter is obviously greater than that to organic matter in sediments in the same place.
GAO Jianhua, WANG Yaping, PAN Shaoming, ZHANG Rui, LI Jun, BAI Fenglong . Source and Distribution of Organic Matter in Seabed Sediments of the Changjiang River Estuary and Its Adjacent Sea Area[J]. Acta Geographica Sinica, 2007 , 62(9) : 981 -991 . DOI: 10.11821/xb200709009
[1] Li Daoji, Li Jun, Chen Jiyu et al. A study on suspended material in the Changjiang River Estuary. Oceanologia et Limnologia Sinica, 2000, 31(3): 295-301.
[李道季, 李军, 陈吉余等. 长江河口悬浮颗粒物研究. 海洋与湖沼, 2000, 31(3): 295-301.]
[2] Cauwet G, MacKenzie F T. Carbon inputs and distributions in estimaties of turbid rivers: The Yangtze and Yellow rivers (China). Marine Chemistry, 1993, 43: 235-246.
[3] Yang Z S, Milliman J D, Fitzgerald M G. Transfer of water and sediment from the Yangtze River to the East China Sea, June, 1980. Canadian Journal of Fisheries and Aquatic Sciences, 1983, 40(suppl.): 72-82.
[4] Jia J J, Gao S, Wang Y P. Flux and cycling of suspended sediment in the waters adjacent to the Changjiang River mouth. In: Hu D X, Zhang S. Land-ocean Interaction in the Estuaries of the Changjiang and Pearl Rivers and the Adjoining Regions. Beijing: China Ocean Press, 2001. 111-121.
[贾建军, 高抒, 汪亚平. 长江口外和东海海域悬沙通 量与循环过程. 见: 胡敦欣, 章申. 长江、珠江口及邻近海域陆海相互作用. 北京: 海洋出版社, 2001. 111-121.]
[5] Yanagi T, Takahashi S, Hoshira A et al. Seasonal variation in the transport of suspended matter in the East China Sea. Journal of Oceanography, 1996, 52: 539-552.
[6] Tang T Y, Hsueh Y, Yang Y J et al. Continental slope flow northeast of Taiwan. Journal of Physical Oceanography, 1999, 29: 1353-1362.
[7] Huang J J, Lin P L, Liu K K. Dissolved and particulate organic carbon in the southern East China Sea. Continental Shelf Research, 2000, 20: 545-569.
[8] Milliman J D, Xie Q C, Yang Z S. Transfer of particulate organic carbon and nitrogen from the Yangtze River to ocean. American Journal of Science, 1984, 284: 824-834.
[9] Edmond J M, Spivack A, Grant B C et al. Chemical dynamics of the Changjiang Estuary. Continental Shelf Research, 1985, 4: 17-36.
[10] Tan F C, Cai D L, Edmond J M. Carbon isotope geochemistry of the Changjiang Estuary. Estuary Coastal and Shelf Science, 1991, 32: 395-403.
[11] Cai D L, Han Y B. Carbon isotopic composition and flux of particulate organic matter in the Changjiang. Acta Oceanology Sinica, 1998, 17: 337-342.
[12] Wu Y, Zhang J, Liu S M et al. Sources and distribution of carbon within the Yangtze River system. Estuarine, Coastal and Shelf Science, 2007, 71: 13-25.
[13] Wu Y, Dittmar T, Ludwichowski K-U et al. Tracing suspended organic nitrogen from the Yangtze River catchments into the East China Sea. Marine Chemistry, 2007, doi:10.1016/j.marchem.2007.01.022.
[14] Zhang J, Wu Y, Jennerjahn, T C et al. Distribution of organic matter in the Changjiang (Yangtze River) Estuary and their stable carbon and nitrogen isotopic ratios: Implications for source discrimination and sedimentary dynamics. Marine Chemistry, 2007, doi:10.1016/j.marchem.2007.02.003.
[15] Rice D L, Tenore K R. Dynamics of carbon and nitrogen during the decomposition of detritus derived from estuarine macrophytes. Estuary Coastal and Shelf Science, 1981, 13: 681-690.
[16] Sun Xia, Wang Baodong, Wang Xiulin et al. Spatial and temporal distribution of the nutrients and its controlling factors in the high-frequency HAB occurrence area in the East China Sea. Marine Science, 2004, 28 (8): 28-32.
[ 孙霞, 王保栋, 王修林等. 东海赤潮高发区营养盐时空分布特征及其控制要素. 海洋科学, 2004, 28 (8): 28-32.]
[17] Mcmanus J. Grain size determination and interpretation. In: Tucker M (ed.). Techniques in Sedimentology. Oxford: Blackwell, 1988. 63-85.
[18] Mayer L M. Surface area control of organic carbon accumulation in the continental shelf sediments. Geochemica et Cosmochimica Acta, 1994, 58 (4): 1271-1284.
[19] Keil R G, Tsamakis E C, Fuh C B et al. Mineralogical and texture controls on the organic composition of coastal marine sediments. Geochemica et Cosmochimica Acta, 1994, 58 (2): 879-893.
[20] Jin Xianglong. Marine Geology of East China Sea. Beijing: China Ocean Press, 1992.
[金翔龙. 东海海洋地质. 北京: 海洋出版社, 1992.]
[21] Wang Baodong, Zhang Run, Zan Jiaye. Distributions and transportation of nutrients in Changjiang River Estuary and its adjacent sea areas. Acta Oceanologica Sinica, 2002, 24(1): 53-58.
[王保栋, 战闰, 藏家业. 长江口及其邻近海域营养 盐的分布特征和输送途径. 海洋学报, 2002, 24(1): 53-58.]
[22] Zhang Yansong, Zhang Feijun, Guo Xuewu et al. Autumn flux of particle settling observed at three representative stations in East China Sea. Oceanologia et Limnologia Sinica, 2006, 37(11): 28-34.
[张岩松, 章飞军, 郭学武等. 东海 秋季典型站位沉降颗粒物通量. 海洋与湖沼, 2006, 37(11): 28-34.]
[23] Zhu J R. Dynamic mechanism of the upwelling on the west side of the submerged river valley off the Changjiang mouth in summertime. Chinese Science Bulletin, 2003, 48(24): 2754-2758.
[24] Hu D X. Upwelling and sedimentation dynamics (I): The role of upwelling in sedimentation in the Huanghai Sea and East China Sea: A description of general features. Chinese Journal of Oceanologia and Limnologia, 1984, 2(1): 12-19.
[25] Cifuentes L A, Coffin R B, Solorzano L et al. Isotopic and elemental variations of carbon and nitrogen in a mangrove estuary. Estuarine, Coastal and Shelf Science, 1996, 43: 781-800.
[26] DeMaster D J, McKee B A. Rates of sediment accumulation and particle reworking based on radiochemical measurements from continental shelf deposits in the East China Sea. Continental Shelf Research, 1985, 4: 143-158.
[27] Cifuentes L A, Sharp J H, Fogel M L. Stable carbon and nitrogen isotope biogeochemistry in the Delaware Estuary. Limnology and Oceanography, 1988, 33: 1102-1115.
[28] Wu Y, Zhang J, Li D J et al. Isotope variability of particulate organic matter at the PN section in the East China Sea. Biogeochemistry, 2003, 65(1): 31-49.
[29] Zhu J R. Distribution of chlorophyⅡ-a off the Changjiang River and its dynamic cause interpretation. Science in China (Series D), 2005, 48(7): 950-956.
[30] Chen Changsheng. Marine Ecology System Dynamics and Model. Beijing: Higher Education Press, 2003. 96.
[陈长胜. 海洋生态系统动力学与模型. 北京: 高等教育出版社, 2003. 96.]
/
| 〈 |
|
〉 |