龙感湖沉积物碳、氮同位素记录的环境演化
Environmental evolution of Longgan Lake sediments recorded by carbon and nitrogen isotopes
查看参考文献20篇
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文摘
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通过对龙感湖沉积物样品中δ~(13)C_(org)、δ~(15)N、有机碳与总氮比值(C/N)、总有机碳(TOC)和总氮(TN)含量的测定,分析了自1948年以来龙感湖沉积物有机质的来源,探讨了湖泊生产力变化以及随后的沉积演化过程.结果表明:在这个沉积历史阶段中,湖泊沉积物有机质以自生有机物源为主,大型水草发育,伴有低等藻类参与,湖泊沉积物受陆源输入影响较小,基本不受城市污染物的输入影响,但受流域农业化肥大量使用的影响较大;随着营养物质的输入,湖泊的初级生产力逐渐增大,藻类开始发育;在沉积历史上L_2点附近低等藻类相对发育早,但L1点沉积物相对能够固定更多的营养盐. |
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其他语种文摘
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Through the determinations of δ~(13)C_(org), δ15N, total organic C, total N and C/N ratio in Longgan Lake sediments, this paper analyzed the sources of sedimentary organic matters in the Lake, variations of lake productivity, and evolution process of sediment since 1948. The results showed that the sedimentary organic matters mainly derived from native aquatic organic matters. The aquatic plants were float grasses accompaning with algae. Land matters and city pollutants had little influence, while large amounts of applied chemical fertilizers had great effects on the lake sediments. With the input of nutrients, the primary productivity of the lake increased, and algae began to flourish. In the sedimentary history, algae started to grow earlier in site L_2 than in site L1, but the sediment in site L1 could fix more nutrients. |
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来源
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生态学杂志
,2007,26(5):693-699 【核心库】
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关键词
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龙感湖
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沉积物
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有机碳同位素
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氮同位素
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有机质来源
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沉积环境
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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, 550002
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天津师范大学, 天津市水资源与水环境重点实验室, 天津, 300074
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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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1000-4890 |
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学科
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环境科学基础理论 |
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基金
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中国科学院知识创新工程重大项目
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文献收藏号
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CSCD:2793797
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