Sedimentological and geochemical characteristics for evolution of salt marsh in the Changjiang River Estuary in China

CHEN Qing-qiang; MENG Yi; ZHOU Ju-zhen; GU Jing-hua; HU Ke-lin

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Article Navigation > Haiyang Xuebao > 2007 > 29(6): 45-52

CHEN Qing-qiang, MENG Yi, ZHOU Ju-zhen, GU Jing-hua, HU Ke-lin. Sedimentological and geochemical characteristics for evolution of salt marsh in the Changjiang River Estuary in China[J]. Haiyang Xuebao, 2007, 29(6): 45-52.

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Sedimentological and geochemical characteristics for evolution of salt marsh in the Changjiang River Estuary in China

State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2006-08-15
Rev Recd Date: 2007-03-08

Abstract

Abstract

Sedimento logical and geochemical characteristics for the evolution of salt marshes in the Changjiang River Estuary(CRE) were studied based on analy ses of grain sizes,contents of particulate organic carbon(POC) and compositions of stable carbon isotopes(δ¹³C) for core samples in a small depth inter val(1cm) from three locations with typical elevations(the land-ward part of high tidal flat,the seaw ard part of middle tidal flat and bare flat) at the eastern Chongming beach salt marsh in the CRE. Results indicated that grain-size coefficients,POC contents and δ¹³C values showed obvious fluctuations with depth,respectively. There existed predominant differencesing rain size and geochemical character istics between the three typical locations of the salt marsh,and clear tendencies from the high tidal flat to the bare flating rain size and geochemical char acteristics, respectively. This was correlated closely to the regularevo lution of the tidal flat. Fluctuations between periods with weak erosion and periods with relative intense erosion were discerned from the limited depth of the cores from high tidal flat and middle tidal flat,sugg esting that the evolution processes of the salt marsh were no nlinear in the CRE. Clay contents exerted great influences on both flat tendencies and vertical changes of POC contents and δ¹³C values,respectively. This indicated that evolution of the salt marsh in the CRE was constrained obviously by discharges of water and suspended matter from fluvial catchments of the Changjiang River. Sampling in small depth interval(≤1cm) was then effective in sedimentological and geochemical studies on the salt marshes with complex depositional dynamics,frequent accretion and erosion,and that muddy laminae and silty laminae in millimeter thickness developed well in strata. Evolution processes of salt marshes could bestudied in detail by this sampling strategy,which provided a new measure for studies on annual development of salt marshes.
- Changjiang River Estuary,
- salt marsh,
- depositional process,
- geochemical characteristics

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References

PETHICK J S.The geomorphology of mudflats[A].NORDSTROM K F,ROMAN C T.Estuarine Shores.Chichester:Wiley and Sons Ltd,1996.185-211.

WRIGHT L D,COLEMAN J M,THOM B G.Processes of channel decelopment in a high-tide-range environment:Cambridge Gulf-Ord River Delta,Western Australia[J].Journal of Geology,1973,81:15-41.

XU Shi-yuan,SHAO Xu-sheng,CHEN Zhong-yuan,et al.Storm deposits in the Changjiang Delta[J].Science in China(Series B),1990,33:1 242-1 250.

WALTHER J.Einleitung in die Geologie als Historische Wissenschaft:Bd.3.Lithogenesis der Gegenwart[M].Jena:Fischer Verlag,1894.535-1055.

范代读,李从先,陈美发,等.长江三角洲泥质潮坪沉积间断的定量分析[J].海洋地质与第四纪地质,2001,21(4):1-6.

孟伟,雷坤,郑丙辉,等.渤海湾西岸潮间带现代沉积速率研究[J].海洋学报,2005,27(3):67-72.

李从先,张桂甲,李铁松.潮坪沉积的韵律性与作用的周期性[J].沉积学报,1995,13(增刊):71-78.

李从先,王平,范代读,等.潮汐沉积率和沉积间断[J].海洋地质与第四纪地质,1999,19(2):11-18.

袁兴中,陆健健,刘红.河口盐沼植物对大型底栖动物群落的影响[J].生态学报,2002,22(3):326-333.

袁兴中,陆健健.长江口岛屿湿地的底栖动物资源研究[J].自然资源学报,2001,16(1):37-41.

上海市海岛资源综合调查报告编写组.上海市海岛资源综合调查报告[M].上海:上海科学技术出版社,1996.13-19,22-31,121-128.

杨世伦,陈沈良,王兴放.长江口未来环境演变的若干影响因子及减灾对策[J].自然灾害学报,1997,6(4):74-81.

何小勤,戴雪荣,刘清玉,等.长江口崇明东滩现代地貌过程实地观测与分析[J].海洋地质与第四纪地质,2004,24(2):23-27.

FOLK R L,WARD W C.Brazos River bar:a study in the significance of grain size parameters[J].Journal of Sedimentary Petrology,1957,27:3-26.

MEYERS P A.Preservation of elemental and isotopic source identification of sedimentary organic matter[J].Chemical Geology,1994,114:289-302.

SMITH B N,EPSTEIN S.Two categories of ¹³C/¹²C ratios for higher plants[J].Plant Physiology,1971,47:380-384.

CIFUENTES L A,COFFIN R B,SOLORZANO L,et al.Isotopic and elemental variations of carbon and nitrogen in a mangrove estuary[J].Estuarine,Coastal and Shelf Science,1996,43:781-800.

THORNTON S F,McMANUS J.Application of organic carbon and nitrogen stable isotope and C/N ratios as source indicators of organic matter provenance in estuarine systems:evidence from the Tay Estuary,Scotland[J].Estuarine,Coastal and Shelf Science,1994,38:219-233.

COLOMBO J C,SILVERBERG N,GEARING J N.Biogeochemistry of organic matter in the Laurentian Trough:II.Bulk composition of the sediments and relative reactivity of major components during early diagenesis[J].Marine Chemistry,1996,51:295-314.

RICHARD P,RIERA P,GALOIS R.Temporal variations in the chemical and carbon isotope compositions of marine and terrestrial organic inputs in the Bay of Marrenes-Oléron(France)[J].Journal of Coastal Research,1997,3:879-889.

ANDREWS J E,GREENAWAY A M,DENNIS P F.Combined carbon isotope and C/N ratios as indicators of source and fate of organic matter in a poorly flushed,tropical estuary:Hunts Bay,Kingston Harbour,Jamaica[J].Estuarine,Coastal and Shelf Science,1998,46:743-756.

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