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首页> 外文期刊>Science of the total environment >Climatic warming and overgrazing induced the high concentration of organic matter in Lake Hulun, a large shallow eutrophic steppe lake in northern China
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Climatic warming and overgrazing induced the high concentration of organic matter in Lake Hulun, a large shallow eutrophic steppe lake in northern China

机译：气候变暖和过度放牧导致呼伦湖有机质含量高，呼伦湖是中国北方大型浅水富营养化草原

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摘要

An abnormally high concentration of organic matter (OM) in Lake Hulun, a large shallow eutrophic lake located in the sparsely populated Hulun Buir Steppe, was observed in a field investigation. Little was known about the origin of the OM. To identify the source of the OM in Lake Hulun, the carbonitrogen (C/N) ratio, natural abundance of stable isotope and three dimensional excitation emission matrix (3DEEM) fluorescence spectroscopy techniques were employed. Furthermore, a cyanobacterial incubation and degradation experiment was conducted in the laboratory to quantify the contribution of algae to dissolved organic matter (DOM) in Lake Hulun. C/N. the stable carbon isotope (δ~(13)C) values typical of C3 plant debris in particulate organic matter (POM) and the fluorescence indices of DOM indicate that most of the OM in Lake Hulun is of terrigenous origin. It was deduced that only about 10.2% and 7.3% of DOM were contributed by algae in September and January, respectively, according to the linear correlation between the concentrations of algae-derived DOM and the fluorescence intensities of tyrosine-like matter. According to the stockbreeding development and climate change in Hunlun Buir Steppe, we deduced that the destruction of the grassland ecosystem by overgrazing in specific locations and trends in climatic warming and drying were the main factors causing the increase of OM and nutrient concentrations in Lake Hulun. This result highlights the need to pay more attention to the inputs of terrigenous organic matter to the lakes in northern China.%State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 2W093, China;State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 2W093, China;State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 2W093, China;Meteorological Bureau of Hulun Buir City, Hailaer 012008, China;
机译：在野外调查中发现了呼伦湖中异常高浓度的有机物（OM），呼伦湖是位于人烟稀少的呼伦贝尔草原上的一个大型浅水富营养化湖泊。关于OM的起源知之甚少。为了确定呼伦湖中OM的来源，采用了碳/氮（C / N）比，稳定同位素的自然丰度和三维激发发射矩阵（3DEEM）荧光光谱技术。此外，在实验室中进行了蓝细菌培养和降解实验，以量化藻类对呼伦湖中溶解性有机物（DOM）的贡献。 C / N。颗粒有机物（POM）中典型的C3植物残体的稳定碳同位素（δ〜（13）C）值和DOM的荧光指数表明呼伦湖的大部分OM均来自陆源。根据藻类来源的DOM的浓度与酪氨酸样物质的荧光强度之间的线性相关性，推断9月和1月藻类仅贡献了约10.2％的DOM和7.3％的藻类。根据呼伦贝尔草原的畜牧业发展和气候变化，我们推论出特定地点过度放牧对草地生态系统的破坏以及气候变暖和干燥的趋势是造成呼伦湖有机肥和养分含量增加的主要因素。这一结果表明，需要更多地关注中国北方湖泊中陆源有机质的输入。％南京大学环境学院，污染控制与资源再利用国家重点实验室，南京2W093；国家重点实验室南京大学环境学院，污染控制与资源化利用研究室，南京2W093；南京大学环境学院，污染控制与资源化利用国家重点实验室，南京2W093；呼伦贝尔市气象局，海拉尔012008，中国;

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  • 来源
    《Science of the total environment》 |2012年第1期|p.332-338|共7页
  • 作者

    Xiaofeng Chen; Xiaoming Chuai; Liuyan Yang; Huiying Zhao;

  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China;

    Meteorological Bureau of Hulun Buir City, Hailaer 012008, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    source identification; organic matter; climate change; overgrazing; lake hulun;

    机译：来源识别;有机物;气候变化;过度放牧呼伦湖;

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