, Volume 19, Issue 1, pp 246–254 | Cite as

Effect of the invasion of vascular plants on heat and water balance in the Sarobetsu mire, northern Japan

  • Kentaro Takagi
  • Taro Tsuboya
  • Hidenori Takahashi
  • Takashi Inoue


To assess the effect of the invasion of vascular plants on the heat and water balance in aSphagnum bog, evapotranspiration was compared throughout a growing season in theSphagnum bog and in the adjoining transition peatland where vascular plants completely cover the ground surface in the Sarobetsu mire, northern Japan. Cumulative evapotranspiration over 152 days was 372 mm in the transition peatland and 285 mm in the bog, with the differences between the sites becoming clear from mid-August. Therefore, we consider the invasion of the vascular plants into theSphagnum bog to accelerate water consumption. However, levels of evapotranspiration in mid-summer did not differ greatly between the sites. In mid-summer, the ratio of latent heat flux to net radiation decreased in the transition peatland on days when humidity deficit was large, although, in the bog, the ratio showed a large value in those days. We attribute the decrease in the ratio to stomatal closure with the increase in humidity deficit. We also conclude that the invading vascular plants developed a negative feedback mechanism of stomatal response to the humidity deficit of the ambient air in mid-summer.

Key Words

evapotranspiration humidity deficit bog transition peatland Sasa Sphagnum 


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Copyright information

© The Society of Wetland Scientists 1997

Authors and Affiliations

  • Kentaro Takagi
    • 1
  • Taro Tsuboya
    • 1
  • Hidenori Takahashi
    • 1
  • Takashi Inoue
    • 2
  1. 1.Graduate School of Environmental Earth ScienceHokkaido UniversitySapporoJapan
  2. 2.Faculty of AgricultureHokkaido UniversitySapporoJapan

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