Abstract
With the purpose of tracing the variations of the organic matter sources of sediments, a sample column (25.96 m in size) from the Hemudu Area of Hangzhou Bay was put through AMS14C dating and biogeochemical analysis. TOC and TN presented similar variation trends, suggesting the same and stable sources of organic matter; the bad correlation between the grain size and TOC content indicated that the organic matter occurrence was neither controlled by the grain size nor the surface absorption of the fine particles, but it may has something to do with the complicated sedimentary hydrodynamic force, the input of organic matter and microbial action. Judging on the basis of C/N ratio and δ13CTOC, the organic carbon in sediments was a mixture of terrigenous and marine organic carbon, testifying to the land-sea interaction characteristic of the study area. The indexes experienced abrupt changes at about 6.5 ka BP, when the lighter terrigenous organic carbon made an increased proportion to the heavier marine organic carbon. The phenomenon reflected the enclosure of the lagoon and the reduced exchange interactions with the seawater of open seas.
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References
S. Emerson and J. I. Hedges, “Processes controlling the organic carbon content of open ocean sediments,” Paleoceanography, 3 (5), 621–634 (1988).
M. R. Fontugne and J. M. Jouanneau, “Modulation of the particulate organic carbon flux to the ocean by a macrotidal estuary:Evidencefrom measurements of carbon isotopes in organic matter from the Gironde system,” Estuary Coast Shelf Sci. 24 (3), 377–387 (1987).
B. Fry, R. S. Scalan, and P. L. Parker, “Stable carbon isotope evidence for two sources of organic matter in coastal sediments: seagrasses and plankton,” Geochim. Cosmochim. Acta 41, 1875–1877 (1977).
S. Hankinson, “A review of various factors influencing the stable carbon isotope ratio of organic lake sediments by the change from glacial to post-glacial environmental conditions,” Quat. Sci. Rev. no. 4, 135–146 (1985).
Z. G. Huang, W. Q. Zhang, and S. Y. Xu, Comparison Research on Holocene Environment Evolution of China and Japan (Guangdong Science and Technology Press, Guangzhou, 2002) [in Chinese].
R. V. Krishnamurthy, S. K. Bhattachary, and S. Kusumgar, “Palaeoclimatic changes deduced from 13C/12C and C/N ratios of Karewa lake sediments, India,” Nature 323 (6084), 150–152 (1986).
H. R. Lang, “Neolithic sites and Holocene sea level changes at Hemudu, Yuyao of Zhejiang,” Zhejiang Geol. 3 (1), 5–13 (1987) [in Chinese].
M. L. Li, D. W. Mo, G. P. Sun, K. S. Zhou, and L. J. Mao, “Paleosalinity in Tianluoshan Site and the Relation between Hemudu Culture and Its Environmental Background,” Acta Geograph. Sin. 64 (7), 807–816 (2009a) [in Chinese].
C. H. Li, L. Y. Tang, H. W. Wan, S. M. Wang, S. C. Yao, and D. F. Zhang, “Vegetation and human activity in Yuyao (Zhejiang province) inferred from the sporopollen record since the late Pleistocene,” Acta Micropalaeontol. Sin. 26 (1), 48–56 (2009b) [in Chinese].
D. Luo, Quaternary Characteristics and Lithofacies Paleogeography of Ningbo Area in ZheJiang (Chengdu University of Technology, Chengdu, 2011) [in Chinese].
P. A. Meyers, “Preservation of elemental and isotopic source identification of sedimentary organic matter,” Chem. Geol. 114 (3–4), 289–302 (1994).
J. D. Milliman, Q. C. Xie, and Z. S. Yang, “Transfer of particulate organic carbon and nitrogen from the Yangtze River to the ocean,” Am. J. Sci. 284 (7), 824–834 (1984).
M. H. O’Leary, “Carbon isotopes in photosynthesis,” Bioscience 38 (5), 328–336 (1988).
J. G. Qin, D. Taylor, and P. Atahan, X. R. Zhang, G. X. Wu, J. Dodson, H. B. Zheng, and F. T. Dvey, “Neolithic agriculture, freshwater resources and rapid environmental changes on the lower Yangtze, China,” Quat. Res. 75, 55–65 (2011).
W. Sackett, G. Brooks, M. Conkright, L. Doyle, and L. Yarbro, “Stable isotope compositions of sedimentary organic carbon in Tampa Bay, Florida, U.S.A.: implications for evaluating oil contamination,” Appl. Geochem. no. 1, 131–137 (1986).
W. Shi, C. M. Ma, F. Jiao, C. Zhu, and F. B. Wang, “Archaeological sites, buried peat and fluctuation of sea-level in Holocene in the Ningshao Plain in Zhejiang Province, China,” Acta Oceanol. Sin. 30 (4), 69–75 (2008) [in Chinese].
B. N. Smith and S. Epstein, “Two categories of 13C/12C ratio for higher plants,” Plant Physiology, 47 (3), 380–384 (1971).
R. Stein, “Accumulation of Organic Carbon in Marine Sediments” (Springer-Verlag, Berlin, 1991).
M. Stuiver, “Climate versus changes in 13C content of the organic component of lake sediments during the Late Quarternary,” Quat. Res. 5 (2), 251–262 (1975).
G. P. Sun, “Characteristic of geography environment of the prehistoric cultural settlements in Ningshao Area,” Southeast Culture, no. 155, 16–23 (2002) [in Chinese].
X. J. Sun, N. Q. Du, and M. H. Chen, “The paleovegetation and paleoclimate during time of Hemudu people,” J. Integr. Plant Biol. 23 (2), 146–151 (1981) [in Chinese].
D. D. Wu, C. D. Ge, S. Gao, M. Y. Lv, and Y. Yang, “Carbon, nitrogen geochemical character and source analyses in Changjiang estuarine sediments,” Geochimica, 41 (3), 207–215 (2012) [in Chinese].
W. T. Wu, “Evolution of the Yaojiang Plain in last 7000 years”, Sci. Geograph. Sin. 3 (3), 269–275 (1983) [in Chinese].
S. Y. Yang and C. X. Li, “Compositions of organic elements and carbonate in the late Cenozoic sediments of the Changjiang Delta: Implication for paleoenvironmental changes,” Geochimica, 35 (3), 221–226 (2006)[in Chinese].
Q. Zhang, T. Jiang, Y. F. Shi, L. King, C. L. Liu, and M. Metzler, “Paleoenvironmental changes in the Yangtze Delta during past 8000 years,” J. Geograph. Sci. 14 (1), 105–112 (2004).
W. Y. Zhang, H. Y. Jin, F. Y. Zhang, G. J. Zhao, K. H. Yang, H. L. Li, Y. C. Bai, W. L. Gao, “Organic carbon distribution in the Yangtze River Estuary–Hangzhou Bay and its adjacent sea area,” Adv. Earth Sci. 24 (11), 1202–1209 (2009) [in Chinese].
C. Zhu, C. G. Zheng, C. M. Ma, X. X. Yang, X. Z. Gao, H. M. Wang, and J. H. Shao, “On the Holocene sea level high stand along the Yangtze Delta and Ningshao Plain, East China,” Chin. Sci. Bull. 48 (23), 2428–2438 (2003) [in Chinese].
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Liu, R., Zheng, H. Variability of organic carbon isotope and C/N in the Hemudu Area, Hangzhou Bay and its environmental implications in the Holocene. Geochem. Int. 55, 1154–1163 (2017). https://doi.org/10.1134/S001670291714004X
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DOI: https://doi.org/10.1134/S001670291714004X