Influence of CO<SUB>2</SUB> partial pressure and other factors on spatial and temporal variation of pH in two streams draining the watersheds having different size of riparian zone

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  • NAKAGAWA Yasunori
    Northern Forestry Research and Development Office, Forest Research Station, Field Science Center for Northern Biosphere, Hokkaido University
  • SHIBATA Hideaki
    Northern Forestry Research and Development Office, Forest Research Station, Field Science Center for Northern Biosphere, Hokkaido University
  • SATOH Fuyuki
    Southern Forestry Research and Development Office, Forest Research Station, Field Science Center for Northern Biosphere, Hokkaido University
  • SASA Kaichiro
    Southern Forestry Research and Development Office, Forest Research Station, Field Science Center for Northern Biosphere, Hokkaido University

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Other Title
  • 異なる渓畔帯幅を持つ集水域から流出する2つの渓流における，pHの時空間変動に及ぼす二酸化炭素分圧とその他の要因による影響
  • Influence of CO2 partial pressure and other factors on spatial and temporal variation of pH in two streams draining the watersheds having different size of riparian zone

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Abstract

We evaluated the spatial and temporal variations of stream pH and the factors causing the stream pH variations for two watersheds in northern Japan. One watershed has a wetland extending along the stream channel, and another a narrow riparian area. We also evaluated the effect of a riparian wetland on the stream pH. Stream pH in the present study was nearly neutral, and was controlled mainly by CO2 partial pressure (hereafter, pCO2) in stream water; stream water gradually changed from spring water having high pCO2 and low pH to downstream water having low pCO2 and high pH through CO2 degassing. Groundwater around the stream channel had a higher pCO2 and lower pH than the stream water. Although the groundwater inflow increases the stream flow, it had no obvious effect on stream pH, suggesting the relatively rapid degassing of CO2 at the soil-stream interface. The watershed having a broad riparian wetland had a small tributary with high pCO2 and low pH, and this tributary directly acidified the main stream. When the flow of this tributary was high during the snowmelt, the longitudinal increase of the stream pH was temporally reversed because of the abundant inflow of the tributary having high pCO2.

Journal

  • ENVIRONMENTAL SCIENCE

    ENVIRONMENTAL SCIENCE 22 (3), 173-186, 2009

    SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

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