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Variation in nitrogen isotopic composition in the Selenga river watershed, Mongolia

机译：蒙古塞伦加河流域氮同位素组成的变化

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摘要

The stable nitrogen (N) isotope ratio (δ15N) has been used to examine the anthropogenic N input (i.e., septic water, wastewater, and manure) to aquatic ecosystems, because anthropogenic N generally has a δ15N signature distinct from that found in nature. Aquatic organisms and the derived organic matter such as sediments are reported to become increasingly enriched in 15N as the human population density increases in watersheds. However, little is known about the relationship in steppe ecosystems, where the livestock population is greater than that of humans. Here, we conducted a preliminary study in the Selenga river mainstream watershed in Mongolia, which covers an area of approximately 300,000 km2. A multiple regression analysis revealed that the δ15N of the riverine sediment was significantly affected by the human population density and more significantly by livestock population density. The population density, including both humans and livestock, significantly influenced δ15N of the macrophytic Potamogeton spp. The results showed that δ15N of riverine organic matter can be an indicator of the human and livestock population density, which is likely associated with the status of N cycles in livestock-dominated watersheds.
机译：稳定的氮（N）同位素比（δ15 N）已用于检查向水生生态系统的人为氮输入（即化粪水，废水和粪便），因为人为氮通常具有δ15 N的特征不同于自然界中的特征。据报道，随着流域人口密度的增加，水生生物及其衍生的有机物（例如沉积物）的15 N含量越来越高。但是，人们对草原生态系统中的关系知之甚少，在该生态系统中，牲畜种群多于人类。在这里，我们在蒙古的塞伦加河主流流域进行了初步研究，该流域面积约300,000 km2 。多元回归分析表明，河流沉积物的δ15N受到人口密度的显着影响，而受牲畜种群密度的影响更大。人口密度，包括人和牲畜在内，都极大地影响了大型植物波莫geton spp的δ15N。结果表明，河流有机质的δ15N是人类和牲畜种群密度的指标，可能与以牲畜为主的流域的氮循环状态有关。

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  • 来源
    《Limnology》 |2012年第1期|p.155-161|共7页
  • 作者

    Fujio Hyodo; Junko Nishikawa; Ayato Kohzu; Noboru Fujita; Izuru Saizen; Jamsran Tsogtbaatar; Choijilsuren Javzan; Mangaa Enkhtuya; Davaadorj Gantomor; Narantsetsegiin Amartuvshin; Reiichiro Ishii; Eitaro Wada;

  • 作者单位

    Research Core for Interdisciplinary Sciences, Okayama University, 3-1-1 Tsushimanaka, Okayama, 700-8530, Japan;

    Center for Ecological Research, Kyoto University, Tanakami-cho, Otsu, Shiga, 520-2113, Japan;

    Water and Soil Environment Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan;

    Center for Ecological Research, Kyoto University, Tanakami-cho, Otsu, Shiga, 520-2113, Japan;

    Graduate School of Global Environmental Studies, Kyoto University, Yoshida-Honmachi, Kyoto, 606-8501, Japan;

    Institute of Geoecology, Mongolian Academy of Sciences, Ulaanbaatar, 211238, Mongolia;

    Institute of Geoecology, Mongolian Academy of Sciences, Ulaanbaatar, 211238, Mongolia;

    Institute of Geoecology, Mongolian Academy of Sciences, Ulaanbaatar, 211238, Mongolia;

    Institute of Geoecology, Mongolian Academy of Sciences, Ulaanbaatar, 211238, Mongolia;

    Institute of Bot;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Stable N isotope ratio; Livestock; Population; Watershed; Mongolia;

    机译：稳定的氮同位素比;畜牧业;人口;分水岭;蒙古;

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