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Change in the sedimentary environment of Wanquan River Estuary, Hainan Island,China

Chinese Science Bulletin 2003年第21期48卷 2357-2361页

作者： gechendong O.Slaymaker T.F.Pedersen MOEKeyLaboratoryforCoastandIslandDevelopment NanjingUniversityNanjing210093China DepartmentofGeography TheUniversityofBritishColumbiaVancouverBCV6T1Z2Canada SchoolofEarthandOceanSciences TheUniversityofVictoriaVictoriaBCVSW3P6Canada

Pb geochronology and sediment core profiles of organic carbon, total sulfur and organic carbon isotope (d 13C) values were used to reconstruct the local environ-mental history of the Shamei Lagoon, located in the Wan-quan River Estuary, eastern Hainan Island, China. Totalsulfur and d 13C values decreased upwards in the top 30 cm of a sediment core that spanned the last 200 years of deposi-tion. Total sulfur concentration and d 13C values respectively decreased upward from 1.92% to 0.36%, and -20.63?to -23.64? The C/S ratio in the 19th century and earlier was relatively stable in the range of 0.47—0.80, and there was a positive correlation between organic carbon and total sulfur. Since around 1900 AD, the C/S ratio increased rapidly to a maximum of 3.94, but no simple correlation was found be-tween organic carbon and total sulfur during this more re-cent period. These results indicated that before 1800 AD, the lagoon had a fully marine character, and the location of to-day抯 Wanquan River Estuary was an open *** 1800 to 1900, the salinity of Shamei Lagoon decreased noticeably. The amount of seawater which could enter thelagoon decreased gradually as the Yudai spit grew. Today,seawater scarcely affects the lagoon; it is essentially a fresh-water basin.

关键词：海南岛中国有机碳铅氢化硫水污染 ^210Pb

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