海南洋浦湾近百年来人与自然相互作用下的环境沉积记录

杨海丽; 郑玉龙

海南洋浦湾近百年来人与自然相互作用下的环境沉积记录

国家海洋局第二海洋研究所国家海洋局海底科学重点实验室, 浙江杭州, 310012

基金项目: 我国近海海洋综合调查与评价专项资助项目(908-01-CJ19);国家海洋局第二海洋研究所基本科研业务费专项资助项目

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出版历程
- 收稿日期: 2007-09-10
- 修回日期: 2007-12-25

The sediment records of environmental changes under interactions of nature with mankind during last hundred years in the Yangpu Bay of Hainan, China

Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 2005年8月在海南洋浦湾内湾取得1根柱状样,在铅-210定年的基础上分析沉积物粒度、总有机碳含量及其同位素值(δ¹³C)、总氮含量及其同位素值(δ¹⁵N)、生物硅含量、重金属(镍、镉、铬、铜、锌、铅)含量及有机氯农药(六六六、滴滴涕)含量等参数发现,111cm至表层,沉积物中有机碳、总氮、生物硅含量升高,特别是从45cm至表层,它们的含量明显增加,说明该湾内有富营养化趋势。由有机碳与总氮的原子比和有机碳同位素指示的物源信息可知,该湾内有机质来源为藻类和陆源脉管植物的混合,且以陆源输入为主。陆源有机碳含量与总有机碳含量的相关系数为0.917。自23cm至表层有机碳同位素明显偏轻,氮同位素偏重。从111cm至表层,重金属和有机氯农药含量升高。综合分析各环境指标可知,洋浦湾近百年来环境演变可分为三个时期,即20世纪70年代以前、70年代至90年代、90年代至21世纪初,洋浦湾经历了未污染期、轻度污染期、显著污染期。
- 洋浦湾 /
- 生源物质 /
- 碳、氮稳定同位素 /
- 富营养化 /
- 重金属 /
- 有机氯农药
Abstract: In the summer of 2005,the Second Institute of Oceanog raphy,State Oceanic Administration has investigated adjacent sea of Hainan Island for sediment and environment studies,and collected a sediment core in the Yangpu Bay.On the basis of the dated sediment core,the grain size,total organic carbon and stable organic carbon isotope (δ¹³C),total nitrogen and stable nitrogen isotope (δ¹⁵N),biogenic silica,heavy metals (nickel,cadmium,chromium,copper,zinc,lead),organochlorine pesticides (HCHs,DDTs) were analyzed.From 111 cm to surface,the concentrations of total organic carbon,total nitrogen and biogenic silica show increasing trends.Especially from 45 cm to surface,the trends are significant.So the conclusion can be obtained that accelerated entrophication occurred in the Yangpu Bay.The data of δ¹³ C and the atomicratio of total organiccarbon and total nitrogen reveal the mixing inputs of terrigenous and marine organic matter in the Yangpu Bay.And sediment organic carbon is dominated by terrigenous organic carbon.The corresponding relationship between terrigenous organic carbon and total organic carbon is good,and the value of the relationship coefficient is 0.917.From 23 cm to surface,δ¹³C was decreasing.From bottom to surface,δ¹⁵N was increasing.From 111 cm to surface,the concentrations of heavy metal and organochlorine pesticides show increasing trends.Analyzing all indicators of environmental evolution,the results showed that the development of Yangpu Bay environment during last hundred years can be divided into three stages:before the 1970s characterized by good biogenic environment;from the 1970s to the 1990s,the concentrations of heavy metals,organochlorine pesticides and biogenic elements are increasing;and from the 1990s to the beginning of the 21 century,the environment was polluted by all elements mentioned,and resulted in eutrophication.
- Yangpu Bay of Hainan, China /
- organic carbon/nitrogen stable isotope /
- eutrophication /
- heavy metal /
- organochlorine pesticides /

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