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首页> 外文期刊>Chinese science bulletin >Change in the sedimentary environment of Wanquan River Estuary, Hainan Island, China
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Change in the sedimentary environment of Wanquan River Estuary, Hainan Island, China

机译：海南岛万泉河口沉积环境变化

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摘要

~(210)Pb geochronology and sediment core profiles of organic carbon, total sulfur and organic carbon isotope (δ~(13)C) values were used to reconstruct the local environmental history of the Shamei Lagoon, located in the Wanquan River Estuary, eastern Hainan Island, China. Total sulfur and δ~(13)C values decreased upwards in the top 30 cm of a sediment core that spanned the last 200 years of deposition. Total sulfur concentration and δ~(13)C values respectively decreased upward from 1.92% to 0.36%, and -20.63per thousand to -23.64per thousand. 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 between organic carbon and total sulfur during this more recent period. These results indicated that before 1800 AD, the lagoon had a fully marine character, and the location of today's Wanquan River Estuary was an open embayment. From 1800 to 1900, the salinity of Shamei Lagoon decreased noticeably. The amount of seawater which could enter the lagoon decreased gradually as the Yudai spit grew. Today, seawater scarcely affects the lagoon; it is essentially a freshwater basin.
机译：利用〜（210）Pb地质年代学和有机碳，总硫和有机碳同位素（δ〜（13）C）值的沉积物剖面，重建了东部万泉河口沙梅泻湖的局部环境历史。中国海南岛。在过去的200年沉积中，沉积物芯的顶部30 cm总硫和δ〜（13）C值向上下降。总硫浓度和δ〜（13）C值分别从1.92％下降到0.36％，从-20.63 /千下降到-23.64 /千。 19世纪或更早的C / S比值相对稳定在0.47-0.80的范围内，有机碳和总硫之间呈正相关。自公元1900年左右以来，C / S比迅速增加到最大值3.94，但是在最近的这段时间内，没有发现有机碳与总硫之间的简单关联。这些结果表明，在公元1800年之前，泻湖具有完全的海洋特征，而今天的万泉河河口的位置是一个开放的通道。从1800年到1900年，沙梅泻湖的盐度明显下降。随着鱼带吐水口的增加，可进入泻湖的海水量逐渐减少。今天，海水几乎不影响泻湖。它实质上是一个淡水盆地。

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