巢湖富营养化的沉积记录:结合态脂肪酸及其单体碳同位素特征
Sedimentary Records of the Process of Eutrophication in Chaohu Lake:Evidence from Bound Fatty Acid and Stable Special Carbon Isotope Data
查看参考文献32篇
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文摘
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本文以中国五大淡水湖泊之一的巢湖作为研究对象,在对18cm的沉积钻孔中TOC、TN、δ~(13) C、和δ~(13) N测定的基础上,通过对巢湖现代沉积物中结合态脂肪酸的组成及其单体碳同位素特征的讨论,探讨了近70年来巢湖的富营养化过程. 研究结果表明,巢湖沉积物中总有机质基本参数变化可以划分成二个主要阶段,其中7cm至表层段,δ~(13) N、TOC和TN显著增大,可能与该时期湖泊富营养化持续加剧有关. 利用结合态脂肪酸单体分子C_(16:0)、C_(18:2W6)和单体分子组合TARFA、C_(18:1w7)/C_(18:1w9)、(i-C_(15:0)+a-C_(15:0))/nC_(15:0)比值的特征变化,表明12cm以来结合态脂肪酸以内源的藻类和细菌输入为主,并且从下向上对沉积物中的结合态脂肪酸贡献不断增加,反映出湖泊富营养化过程. 结合态脂肪酸以单体C_(16:0)为主峰,沉积剖面中结合态脂肪酸中单体C_(16:0)的δ~(13)C值在12cm开始迅速的增加,可以作为指示巢湖富营养化发生的重要指标 |
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其他语种文摘
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This study investigated one of the five great China's freshwater lakes-Chaohu Lake. Overall characteristics of organic matter, includingδ~(13) C,δ~(13) N, TN and TOC, from a 18cm surface sediment core were analyzed. The concentrations and stable carbon isotopic composition of the bound fatty acids were also analyzed. Based on the above analyses, this paper discussed the eutrophication process in the Chaohu Lake in recent 70years. The results indicate that the paleoenvironment evolution recorded in the modern sediments of Chaohu Lake can be divided into two main stages, and the values of δ~(13) N, TOC and TN increased at the 0~7cm interval, and it is related with the eutrophication process in the Chaohu Lake. Variations in C_(16:0),C_(18:2W6), C_(18:1w7/C18:1w9),(i-C_(15-0)+a-C_(15:0))/n_(C15:0)and TARFA indicate that the sedimentary organic matter was derived mainly from aquatic planktons and bacteria, and the abundance of aquatic algae led to the enhancement of lake eutrophication. Theδ~(13) C values of bound nC16:0fatty acids in Chaohu Lake sediments are better to record the enhancement of lake eutrophication in recent few decades. Consequently, theδ~(13) C values of bound nC_(16:0)fatty acids may be an important indicator to reflect lake eutrophication process |
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来源
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地球与环境
,2010,38(4):393-401 【核心库】
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关键词
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结合态脂肪酸
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单体碳同位素
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富营养化过程
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沉积柱
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巢湖
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550002
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中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广州, 510640
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中国环境科学研究院湖泊生态环境基地, 国家环境保护湖泊污染控制重点实验室, 北京, 100012
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中国科学院地球化学研究所, 环境地球化学国家重点实验室;;有机地球化学国家重点实验室, 贵阳, 550002
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语种
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中文 |
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ISSN
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1672-9250 |
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学科
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地质学 |
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基金
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中国环科院
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国家自然科学基金项目
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国家973计划
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:4108307
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