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The pH dependence of photosynthesis and elongation of Sphagnum squarrosum and S. girgensohnii in the Picea glehnii mire forest in Cape Ochiishi, north-eastern Japan
Haraguchi, A.; Hasegawa, T.; Iyobe, T.; Nishijima, H. (2003). The pH dependence of photosynthesis and elongation of Sphagnum squarrosum and S. girgensohnii in the Picea glehnii mire forest in Cape Ochiishi, north-eastern Japan. Aquat. Ecol. 37(1): 101-104
In: Aquatic Ecology. Springer: Dordrecht; London; Boston. ISSN 1386-2588, more
Peer reviewed article  

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Keywords
    Ecological zonation; P; Peat; Sediment properties; Soil chemistry; Soil chemistry; Soil chemistry; INW, Japan [Marine Regions]

Authors  Top 
  • Haraguchi, A., correspondent
  • Hasegawa, T.
  • Iyobe, T.
  • Nishijima, H.

Abstract
    We investigated the pH dependence of the elongation of and photosynthesis by Sphagnum squarrosum and S. girgensohnii in a coastal Picea glehnii peat mire in Cape Ochiishi, north-eastern Japan. S. squarrosum grew in the acidic centre of the P. glehnii forest and showed the highest photosynthetic rate at pH = 3.8. S. girgensohnii grew at the margin of the P. glehnii forest and showed the maximum photosynthetic rate at pH = 7.2. Both species showed maximum growth at pH = 3.8. S. squarrosum elongated even at pH = 8.8, whereas S. girgensohnii stopped elongation at pH = 7.2. Although the pH dependence of photosynthesis by the Sphagnum species corresponded well to their distribution along the pH gradient from the centre to the margin of the P. glehnii forest, their short-term photosynthetic activity did not predict their long-term growth.

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