Journal of Geographical Sciences >
The variation of sediments organic carbon content in Chongming east tidal flat during Scirpus mariqueter growing stage
Received date: 2005-04-29
Revised date: 2005-07-05
Online published: 2005-12-25
Supported by
National Natural Science Foundation of China, No.40173030; No.40131020; Excellent Young Teacher Program of the Ministry of Education; Key Program of Shanghai Science Foundation, No.02DJ14029; Science & Technology Department of Shanghai, No.04DZ19301; Project of Chongming Ecological Island Supported by Science & Technology Department of Shanghai
The investigations on the organic carbon (OC) of core sediments were carried out in Chongming east tidal flat (CM) during Scirpus mariqueter growing stage (from April to December 2004) in Yangtze Estuary. The Yangtze River annually transports a runoff discharge of 30,000 m3/s, carrying about 480 million tons of sediments to the estuarine and coastal area, which formed a great OC pool. In the sampling spots, seven quadrats of 50 cm × 50 cm and five sediments cores of 20 cm deep (40 cm deep in December) were randomly established in order to collect vegetations and core sediments samples during the low tide each month except November. After pretreatment, the core sediments were sieved and their OC contents were measured according to the potassium dichromate method. The results show that the higher surface sediment OC content in summer comes from allochthonous terrigenous particle settlements on the Chongming east middle tidal flat S. mariqueter zone. In autumn and winter, the decomposing of the defoliated S. mariqueter increases the surface sediments OC content. Settling velocity, sediment temperature and S. mariqueter growth are the main factors that can control the sediment carbon content. Summer is the "carbon losing" period of the tidal flat sediments, while from September, it changes into the "carbon accumulating" period of sediment OC pool because of the decomposing of dead S. mariqueter community in the sediments. From this alternation of "carbon losing" period and "carbon accumulating" period, we conclude that carbon in the OC pool of the middle tidal flat S. mariqueter zone sediments mainly comes from the atmospheric carbon rooted by S. mariqueter photosynthesis.
CHEN Hua, WANG Dongqi, CHEN Zhenlou, WANG Jun, XU Shiyuan . The variation of sediments organic carbon content in Chongming east tidal flat during Scirpus mariqueter growing stage[J]. Journal of Geographical Sciences, 2005 , 15(4) : 500 -508 . DOI: 10.1360/gs050414
[1] Bao S D, 2000. Soil Agricultural Chemical Analyses. Beijing: China Agriculture Press, 30-34. (in Chinese)
[2] Biederbeck V O, Janzen H H, Campbll C A et al., 1994. Labile soil organic matter as influenced by cropping practices in an arid environment. Soil Biology & Biochemistry, 26: 1647-1656.
[3] Chen F S, Zeng D H, Chen G S et al., 2004. Effects of reclamation on soil organic carbon of some meadow soils, Chinese Journal of Soil Science, 35(4): 413-419. (in Chinese)
[4] Chen J Y, Yang Q L, Zhao C Y, 1988. Report of the Shanghai Coastal Comprehensive Investigation. Shanghai: Shanghai Scientific and Technical Publishers, 390. (in Chinese)
[5] Chen Q Q, Sun Y M, Shen C D et al., 2002. Quantitative study on organic matter turnover characteristics of mountainous soil profiles in the subtropical mountainous area, South China. Scientia Geographica Sinica, 22(2): 196-201. (in Chinese)
[6] Chen X, Zong Y, 1998. Coastal erosion along the Changjiang deltaic shoreline, China: history and prospective. Estuarine, Coastal and Shelf Science, 46: 733-742.
[7] Fu H, Chen Y M, Wang Y R et al., 2004. Organic carbon content in major grassland types in Alax, Inner Mongolia. Acta Ecologica Sinica, 24(3): 469-476. (in Chinese)
[8] Graham M C, Eaves M A, Farmer J G et al., 2001. A study of carbon and nitrogen stable isotope and elemental ratios as potential indicators of source and fate of organic matter in sediments of the Forth estuary, Scotland. Estuarine, Coastal and Shelf Science, 52: 375-380.
[9] Hedges J I, Keil R G. 1995. Sedimentary organic matter preservation: an assessment and speculative synthesis. Marine Chemistry, 49: 81-115.
[10] Huang C C, Zhang X D, Shen J Q et al., 2000. Studies on litterfall and carbon storage of Pinus massoniana forest in Zhejiang Province. Journal of Shaoxing College of Arts and Sciences, 20(6): 61-64. (in Chinese)
[11] Huang Y, Liu S L, Shen Q R et al., 2002. Influence of environmental factors on the decomposition of organic carbon in agricultural soil. Chinese Journal of Applied Ecology, 13(6): 709-714. (in Chinese)
[12] Liu M, Hou L J, Xu S Y et al., 2004. Carbon and nitrogen stable isotopes as tracers to source organic matter in the Yangtze Estuary. Acta Geographica Sinica, 59(6): 918-926. (in Chinese)
[13] M A Go?i, Maria J Teixeira, David W Perkey, 2003. Sources and distribution of organic matter in a river-dominated estuary (Winyah Bay, SC, USA). Estuarine, Coastal and Shelf Science, 57: 1023-1048.
[14] Milliman J D, Xie Q C, Yang Z S, 1984. Transport of particulate organic carbon and nitrogen from the Yangtze River to the ocean. American Journal of Science, 284: 824-834.
[15] Ouyang X J, Huang Z L, Zhou G Y et al., 2003. Accumulative effects of forest community succession on soil chemical properties in Dinghushan of tropical China. Journal of Soil and Water Conservation, 17(4): 51-54. (in Chinese)
[16] Pei H K, Zhu Z H, Qiao Y M et al., 2001. Humus in soil and type of organic phosphorus of soil on different alpine meadow vegetation. Acta Prataculturae Sinica, 10(4): 18-23. (in Chinese)
[17] Shen H T et al., 2001. Material Flux of the Changjiang Estuary. Beijing: China Ocean Press, 14-52. (in Chinese)
[18] Shen Y M, Zeng H, Wang H et al., 2005. Characteristics of halophyte and associated soil a long aggradational muddy coasts in Jiangsu Province. Acta Ecologica Sinica, 25(1): 1-6. (in Chinese)
[19] Sun S C, Cai Y L, Liu H, 2001. Biomass allocation of Scirpus mariqueter along an elevation gradient in a salt marsh of the Yangtze River Estuary. Acta Botanica Sinica, 43(2): 178-185. (in Chinese)
[20] Tan F C, Cai D L, Edmond J M, 1991. Carbon isotope geochemistry of the Changjiang Estuary. Estuarine, Coastal and Shelf Science. 32: 395-403.
[21] Thornton S F, McManus J, 1994. 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. Estuarine, Coastal and Shelf Science, 38: 219-233.
[22] Wang L Q, Liu Q Y, He X Q, 2004. Distribution and influence factors of sediments organic carbon in the Chongming east tidal flat. Marine Geology Letters, 20(8): 30-32. (in Chinese)
[23] Wang S N, 2003. Wetland Utilization and Protection. Shanghai: Shanghai Scientific and Technical Publishers, 87-95. (in Chinese)
[24] Wang X C, Chen R F, Berry A, 2003. Sources and preservation of organic matter in Plum Island salt marsh sediments (MA, USA): long-chain n-alkanes and stable carbon isotope compositions. Estuarine, Coastal and Shelf Science, 58: 917-928.
[25] Wu Y, Zhang J, Zhang Z F et al., 2002. Seasonal variability of stable carbon and nitrogen isotope of suspended particulate matter in the Changjiang River. Oceanologia et Limnologia Sinica, 33(5): 546-552. (in Chinese)
[26] Yong X K, Zhang L Q, 1992. Studies on reproduction ecology of Scirpus mariqueter population. Journal of East China Normal University (Natural Science), 14(4): 94-99. (in Chinese)
[27] Yuan H M, Lu X X, Li X G et al., 2003. Geochemical characteristics of organic carbon in Bohai Sea sediments with natural gain size. Environmental Chemistry, 22(2): 115-120. (in Chinese)
[28] Zhang L Q, Yong X K, 1992. Studies on phenology and spatial distribution pattern of Scirpus mariqueter population. Acta Phytoecologica et Geobotanica Sinica, 16(1): 43-51. (in Chinese)
[29] Zhang W J, Wu J S, Xiao H A et al., 2004. Profile distribution on characteristics and accumulation of organic carbon in typical wetlands in Sanjiang Plain. Advances in Earth Science, 19(4): 558-563. (in Chinese)
[30] Zhang Y S, Zhang F J, Guo X W et al., 2004. Vertical flux of the settling particulate matter in the water column of the Yellow Sea in summer. Oceanologia et Limnologia Sinica, 35(3): 230-238. (in Chinese)
[31] Zhao J S, Ji H W, Guo Z G, 2003. The vertical distribution of particulation organic carbon in the typical areas of the East China Sea in winter. Marine Sciences, 27(6): 59-63. (in Chinese)
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