| Sedimentation rates in the Wanggang salt marshes, Jiangsu |
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| 作者姓名： | WANGAijun GAOShu JIAJianjun PANShaoming |
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| 作者单位： | 1.Third Institute of Oceanography，SOA，Xiamen 361005，China;2.Ministry of Education Key Laboratory for Coast and Islands Development，Nanjing University，Nanjing 210093，China;3.Key Laboratory of Geo-Marine Sciences，Second Institute of Oceanography，SOA，Hangzhou 310012，China |
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| 基金项目： | The Key Project of the N ational Natural Science Foundation of China,N o.40231010，N ational N atural Science Foundation ofChina,N o.40476041，The M inistry ofEducation Ph.D .SubjectProgram ,N o.20020284007 |
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| 摘 要： | 1 IntroductionLand-ocean interaction in coastalzone is one of the key m atters of the International G eosphereand Biosphere Program (IG BP). The key problem s of the second phase in the next decadeinclude the m aterial cycle, the system evolution process …
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| 关 键 词： | 盐沼泽湿地 海洋沉积率 同位素测定 江苏 |
| 收稿时间： | 5 November 2004 |
Sedimentation rates in the Wanggang salt marshes, Jiangsu |
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| WANGAijun GAOShu JIAJianjun PANShaoming.Sedimentation rates in the Wanggang salt marshes, Jiangsu[J].Journal of Geographical Sciences,2005,15(2):199-209. |
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| Authors: | Aijun Wang Shu Gao Jianjun Jia Shaoming Pan |
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| Institution: | (1) Third Institute of Oceanography, SOA, 361005 Xiamen, China;(2) Ministry of Education Key Laboratory for Coast and Islands Development, Nanjing University, 210093 Nanjing, China;(3) Key Laboratory of Geo-Marine Sciences, Second Institute of Oceanography, SOA, 310012 Hangzhou, China |
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| Abstract: | Coastal salt-marshes represent an important coastal wetland system. The total area of coastal wetlands exceeds 5000 km2 in Jiangsu Province, China, but it is decreasing rapidly in response to the intense reclamation activities and coastal erosion along a part of the coastline. Hence, two types of plants, Spartina angelica and Spartina alterniflora, were introduced successively into the Jiangsu coastal areas, in order to protect the coastline from erosion and to increase the accumulation rate. Pb-210 and Cs-137 analyses were carried out for sediment samples from the salt-marshes of Wanggang to determine the sedimentation rate, on the basis of an evaluation of the background activity values and the factors affecting the enrichment of Pb-210. Analysis of a typical sediment column of the tidal flat shows that there is weak absorption of Pb-210 in the silt-dominated sediment. Because of the influences of factors such as storm events, bioturbation, material sources and analytical error, some abnormal data points appear in the Pb-210 record. After ignoring these data the calculated sedimentation rate was 3.3 cm yr-1 on average. Based upon analysis of the Cs-137 dating, the rate since 1963 was 3.1 cm yr-1 on average, similar to the data by Pb-210 dating and the previous studies. The dating results show that there were three stages of sedimentation, with the most rapid accretion being taking place after Spartina angelica was introduced into the area. The study also shows that at the stage of Spartina alterniflora growth, the accretion rate was higher than on the flat surface with the same elevation without the cover of this plant. |
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| Keywords: | salt-marsh wetlands sedimentation rates Pb-210 and Cs-137 dating Spartina angelica and Spartina alterniflora Wanggang Jiangsu Province |
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