| Impact of the cord-grass Spartina alterniflora on sedimentary and morphological evolution of tidal salt marshes on the Jiangsu coast, China |
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| 作者姓名： | WANG Aijun GAO Shu JIA Jianjun |
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| 作者单位： | WANG Aijun 1*，GAO Shu 2，JIA Jianjun 3 1. Open Laboratory of Ocean Coast Environmental Geology，Third Institute of Oceanography，State Oceanic Administration，Xiamen 361005，China 2.Ministry of Education Key Laboratory for Coast and Island Development，Nanjing University，Nanjing 210093，China 3.Key Laboratory of Submarine Geosciences，Second Institute of Oceanography，State Oceanic Administration，Hangzhou 310012，China |
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| 基金项目： | 国家自然科学基金;国家海洋局青年海洋科学基金 |
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| 摘 要： | 1Introduction Asanimportantcomponentofthecoastalsys tem,tidalflatsareformedbytidalactionunderthe conditionofabundantfine grainedsedimentsupply;theybecomeafocusofthestudyonland oceaninter actioninthecoastalzonebecausetheseareasare subjectedtointensehumanac…
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| 关 键 词： | 潮汐 江苏 沉降 海洋动力学 |
| 收稿时间： | 2006-02-21 |
| 修稿时间： | 2006-05-02 |
Impact of the cord-grass Spartina alterniflora on sedimentary and morphological evolution of tidal salt marshes on the Jiangsu coast, China |
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| WANG Aijun,GAO Shu,JIA Jianjun.Impact of the cord-grass Spartina alterniflora on sedimentary and morphological evolution of tidal salt marshes on the Jiangsu coast, China[J].Acta Oceanologica Sinica,2006,25(4):32-42. |
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| Authors: | WANG Aijun GAO Shu and JIA Jianjun |
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| Institution: | 1.Open Laboratory of Ocean Coast Environmental Geology, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China2.Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China3.Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | The tidal flats of the Wanggang area, on the Jiangsu coast, represent the largest continuously distributed coastal wetland in terms of area coverage in China, and the dynamics of tidal flat accretion and erosion is highly complicated. The cord-grass Spartina alterniflora, which was introduced artificially into the Jiangsu coast, has significant influences on the regional tidal flat evolution in terms of deposition rate, spacial sediment distribution patterns and tidal creek morphology. On the basis of the data set of bed elevation and accumulation rate for different periods of time, the applicability of the Pethick-Allen model to the Jiangsu tidal salt marshes is discussed. In addition, caesium-137 dating was carried out for sediment samples collected from the salt marsh of the Wangang area. In combination with the caesium-137 analysis and the data collected from literature, the Pethick-Allen model was used to derive the accumulation rate in the Wanggang tidal flat for the various periods. The results show that the pattern of tidal flat accretion has been modified, due to more rapid accretion following the introduction of S.alterniflora to the region. Surficial sediment samples were collected from representative profiles and analyzed for grain size with a laser particle analyzer. The result shows that fine-grained sediment has been trapped by the plant, with most of the sediment deposited on the Suaeda salsa and Spartina angelica flats being derived from drainage creeks rather than the from gently sloping tidal flats. Remote sensing analysis and in situ observations indicate that the creeks formed in the S.alterniflora flat have a relatively small ratio of width to depth, a relatively high density, and are more stable than the other tidal flat creek systems in the study area. |
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| Keywords: | Spartina alterniflora tidal flat sedimentation morphological evolution Jiangsu coast |
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