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首页> 外文期刊>Landscape and ecological engineering >Estimation of long-term variation in nutrient loads from the Hii River by comparing the change in observed and calculated loads in the catchments
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Estimation of long-term variation in nutrient loads from the Hii River by comparing the change in observed and calculated loads in the catchments

机译：通过比较流域观测到的和计算得出的负荷变化来估算比河的养分负荷长期变化

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摘要

To study the long-term change in nutrient loads from the Hii River to Lake Shinji, water samples were taken repeatedly over a year in 1983/1984 and again in 2001/2002. Annual total nitrogen (TN) loads, estimated from observations of water quality and river flow, increased from 860 to 920 t with a corresponding increase in NO_3-N concentration during the cool season. In contrast, total phosphorus (TP) loads decreased from 96 to 62 t. Annual TN and TP loads, calculated using emission factors and annual statistics for the catchments, showed a tendency to decline from 1986 to 2002. No source could be identified which would result in the increase in TN in the catchments, therefore, the increase in observed TN loads was considered to originate in other areas. Atmospheric nitrogen deposition transported from long distances has elevated the sum of NH_4-N and NO_3-N concentration in rainwater in the cool season. Therefore, it was considered that this resulted in the increase in TN loads in the Hii River.
机译：为了研究从Hii河到Shinji湖的养分负荷的长期变化，在1983/1984年和2001/2002年再次对水进行了一年多的采样。根据对水质和河流流量的观察估计，年度总氮（TN）负荷从860吨增加到920吨，在凉爽季节NO_3-N浓度相应增加。相反，总磷（TP）负荷从96吨减少到62吨。使用排放因子和流域的年度统计数据计算出的年总氮和总磷负荷在1986年至2002年间呈下降趋势。无法确定来源会导致流域总氮增加，因此观测到的增加TN载荷被认为起源于其他地区。在寒冷季节，从远距离输送的大气氮沉积物提高了雨水中的NH_4-N和NO_3-N浓度之和。因此，可以认为这导致了Hii河的TN负荷增加。

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  • 来源
    《Landscape and ecological engineering》 |2008年第1期|39-46|共8页
  • 作者

    Hiroshi Kamiya; Yoshihiro Kano; Koji Mishima; Katsuhiro Yoshioka; Osamu Mitamura; Yu Ishitobi;

  • 作者单位

    Shimane Prefectural Institute of Public Health and Environmental Science, 582-1 Nishihamasada, Matsue, Shimane 690-0122, Japan;

    Shimane Prefectural Institute of Public Health and Environmental Science, 582-1 Nishihamasada, Matsue, Shimane 690-0122, Japan;

    Shimane Prefectural Institute of Public Health and Environmental Science, 582-1 Nishihamasada, Matsue, Shimane 690-0122, Japan;

    Shimane Prefectural Institute of Public Health and Environmental Science, 582-1 Nishihamasada, Matsue, Shimane 690-0122, Japan;

    Limnological Laboratory, School of Environmental Science, University of Shiga, 3165 Hassaka, Hikone,Shiga 522-0057, Japan;

    Shimane Prefectural Institute of Public Health and Environmental Science, 582-1 Nishihamasada, Matsue, Shimane 690-0122, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    river water quality; total nitrogen; total phosphorus; nitrogen deposition; lake shinji;

    机译：河流水质总氮总磷氮沉积新治湖;

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