云南抚仙湖沉积物有机质来源与时空变化特征
Distribution and Source of the Organic Matter in the Sediment of Fuxian Lake,Yunnan Province
查看参考文献42篇
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文摘
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为揭示抚仙湖沉积物总有机碳(TOC)和总氮(TN)的时空分布特征及其主要来源,对抚仙湖表层沉积物和沉积物柱芯的TOC、TN和有机碳同位素组成(δ~(13)C_(org))进行了分析。结果表明,表层沉积物的TOC和TN含量分别为2.02% ~ 3.40%和0.16% ~ 0.36%;沉积物柱芯的TOC和TN含量分别为0.41% ~ 6.63%和0.08% ~ 0.77%,呈现出北湖高南湖低、表层高底部低的分布特征。内源有机质是抚仙湖沉积物中有机质的主要来源,不同湖区外源有机质的输入差异明显,其中南湖沉积物有机质中陆源比例较高。沉积物柱芯C/N值从底部到表层逐步增大,表明抚仙湖沉积物有机质中陆源有机质所占比例持续增加。与内源有机质相比,外源有机质输入增加更快,指示流域内人为活动增强导致流域侵蚀和水土流失加剧。 |
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其他语种文摘
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Total organic carbon(TOC) content,total nitrogen(TN) content,and stable carbon isotope(δ~(13)C) composition of surface and cored sediment samples from the Fuxian Lake in southwest China were determined to explore spatial temporal distributions and sources of the organic matter in the lake sediment. The results showed that TOC of surface and cored sediment samples were in the ranges of 2.02% ~ 3.40% and 0.16% ~ 0.36%,respectively,while TNs were in the ranges of 0.41% ~ 6.63% and 0.08% ~ 0.77%,respectively. As a whole,contents of TOC and TN were higher in the north part than in the south part of the lake,and both decreased as the sediment depth increased due to,probably,the increasing impact of anthropogenic activities. All evidences indicated that the primary production was the main organic carbon(OC) source of the sediment,and contributions of the terrestrial OC source were regionally dependent,and only played an important role in the south part of the Lake. In contrast to most other lakes,the C/N ratios of Fuxian lake sediment samples decreased gradually from the surface to the bottom of sediment columns,suggesting contributions of terrestrial OC were increasing. The more exogenous OC were found in sediments indicated that the soil erosion resulted from increased human activities in the lake area should be received more attentions. |
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来源
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矿物岩石地球化学通报
,2016,35(4):618-624 【核心库】
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DOI
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10.3969/j.issn.1007-2802.2016.04.002
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关键词
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抚仙湖
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沉积物
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有机质
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δ~(13)C
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来源
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地址
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1.
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, 550081
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贵州大学资源与环境工程学院, 贵阳, 550025
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中国航天建设集团有限公司, 北京, 100071
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-2802 |
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学科
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地质学 |
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基金
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国家重点研发计划项目
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国家自然科学基金项目
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贵州省重大基础应用研究计划项目
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文献收藏号
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CSCD:5804913
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