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Dissolved oxygen concentration in river sediment of the Lake Biwa tributaries, Japan

机译：日本琵琶湖支流河流沉积物中的溶解氧浓度

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摘要

The dissolved oxygen concentration in the sediment pore water downstream of rivers in the Lake Biwa basin was measured, and the factors affecting the dissolved oxygen concentration were analyzed. In August 2003, nine rivers (Sakai, Nakanoi, Hebisuna, Anziki, Yasu, Echi, Ane, Oh, and Ohura) were surveyed. The dissolved oxygen was depleted in the sediment pore water of the rivers with a high proportion of particles less than 250 μm in size. For these rivers, the difference between the dissolved oxygen concentrations of the river surface water and the pore water was large, ranging from −9.54 to −5.26 mg L−1. It was found that the proportion of land turned to paddy fields has an effect on the percentage of the particles below 250 μm (standard partial regression coefficient = 0.807, p = 0.023). These results suggest that, in the Lake Biwa basin, the sedimentation of the fine particles released from paddy fields results in poor dissolved oxygen in the river sediment downstream. In addition, the water flow conditions in small- and medium-scale rivers without headwaters also affect the sedimentation of suspended particles.
机译：测量了琵琶湖流域河流下游沉积物孔隙水中的溶解氧浓度，并分析了影响溶解氧浓度的因素。 2003年8月，对9条河流（Sa，中野，Hebisuna，Anziki，Yasu，Echi，Ane，Oh和Ohura）进行了调查。河流中的沉积物孔隙水中的溶解氧被消耗掉，其中大部分颗粒小于250微米。对于这些河流，河流地表水和孔隙水的溶解氧浓度之间的差异较大，范围为-9.54至-5.26 mg L-1 。已经发现，转向稻田的土地比例对低于250μm的颗粒的百分比有影响（标准偏回归系数= 0.807，p = 0.023）。这些结果表明，在琵琶湖流域，从稻田中释放出的细颗粒的沉积导致下游河流沉积物中的溶解氧较差。此外，在没有水源的中小规模河流中的水流条件也会影响悬浮颗粒的沉积。

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  • 来源
    《Limnology》 |2012年第1期|p.149-154|共6页
  • 作者

    Yoshihiro Yamada; Yugo Mito; Akitake Igeta; Eitaro Wada;

  • 作者单位

    Faculty of Agriculture, Kagawa University, 2393 Ikenobe Miki-cho, Kita, Kagawa, 761-0795, Japan;

    The United Graduate School of Agricultural Sciences, Ehime University, 2393 Ikenobe Miki-cho, Kita, Kagawa, 761-0795, Japan;

    Research Institute for Humanity and Nature, 457-4 Motoyama Kamigamo, Kita-ku, Kyoto, 603-8047, Japan;

    Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 236-0001, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Dissolved oxygen; Lake Biwa; Paddy field; River; Sediment;

    机译：溶解氧琵琶湖稻田河沉积物;

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