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Seasonal variation of water chemistry and sulfur budget in an acid-sensitive river along the Sea of Japan

机译：日本海沿岸酸敏感河的水化学和硫预算的季节性变化

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摘要

A long-term declining trend of pH values has been observed for several rivers in areas of central Japan that are geologically dominated by acidic rocks such as granite, rhyolite, or chert. We monitored the seasonal variation in water chemistry in one of these rivers: the Araya River in Niigata Prefecture. During the 4-year survey period, we observed temporary acidification during the rainy and snowmelt seasons when the river flow rate abruptly increased. In the rainy season, the decrease in pH may be attributable to the dilution of almost all ions and increased leaching of NO3 − from the catchment. In the snowmelt season, decreases in pH were found to be associated with peaks of SO4 2−, where the SO4 2− was possibly derived from that accumulated in the snowpack. The data pertaining to the river showed that it had a sensitive response to meteorological events and was likely to be acid sensitive. The estimated mass balance of the river showed that the SO4 2− output exceeded the corresponding input to the Araya River catchment. Mobilization of internal sulfur accumulated in forest ecosystems might have contributed to the observed long-term acidification of this acid-sensitive river.
机译：在日本中部地区的几条河流中，pH值呈长期下降趋势，这些河流在地质上主要由酸性岩石（如花岗岩，流纹岩或硅藻土）主导。我们监测了其中一条河（新泻县的Araya河）中水化学的季节性变化。在为期4年的调查期内，我们观察到在雨季和融雪季节中，河水流量突然增加时会暂时酸化。在雨季，pH值降低可能归因于几乎所有离子的稀释和从集水区中NO3-的浸出增加。在融雪季节，发现pH值下降与SO4 2-的峰值有关，其中SO4 2-可能来自积雪堆中的积累。有关这条河的数据表明，它对气象事件有敏感的反应，并且可能对酸敏感。估算的河流质量平衡表明，SO4 2-的输出量超过了Araya河流域的相应输入量。森林生态系统中积累的内部硫的动员可能有助于观察到该酸敏感河的长期酸化。

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  • 来源
    《Limnology》 |2013年第2期|195-209|共15页
  • 作者

    Ryo Kobayashi; Yani Sumarriani; Naoyuki Yamashita; Tsutomu Ohta; Hiroki Matsubara; Hiroaki Yagoh; Makoto Nakata; Hiroyuki Sase;

  • 作者单位

    Asia Center for Air Pollution Research Japan Environmental Sanitation Center">(1);

    Niigata Scientific Service">(5);

    Experimental Station for Water Resources Environment Research Center for Water Resources">(2);

    Asia Center for Air Pollution Research Japan Environmental Sanitation Center">(1);

    Asia Center for Air Pollution Research Japan Environmental Sanitation Center">(1);

    Horiba Ltd">(3);

    Asia Center for Air Pollution Research Japan Environmental Sanitation Center">(1);

    Faculty of Agriculture Niigata University">(4);

    Asia Center for Air Pollution Research Japan Environmental Sanitation Center">(1);

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Acidification; Meteorological event; Snowmelt; Mass balance; Sulfur;

    机译：酸化;气象事件;融雪;质量平衡;硫;

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