Ecological Research

, Volume 8, Issue 2, pp 111–121

Comparison of ecophysiological responses to heavy snow in two varieties ofAucuba japonica with different areas of distribution

Authors

  • Atsushi Kume
    • Department of Biology, School of EducationWaseda University
  • Yoshio Ino
    • Department of Biology, School of EducationWaseda University
Article

DOI: 10.1007/BF02348523

Cite this article as:
Kume, A. & Ino, Y. Ecol. Res. (1993) 8: 111. doi:10.1007/BF02348523

Abstract

Aucuba japonica varieties are common evergreen understory shrubs in Japan.Aucuba japonica var.borealis is distributed on the Sea of Japan side of Honshu and Hokkaido where heavy snow cover lasts for more than 3 months in winter.Aucuba japonica var.japonica is distributed in areas with shallow or no snow on the Pacific Ocean side of Honshu and Shikoku. The ecophysiological characteristics of var.borealis were compared with those of var.japonica to examine the effects of heavy and long-term snow cover on the life cycle of var.borealis. Shoots of both varieties were shaded in crushed ice for 110 days, but their photosynthetic activities, chlorophyll contents and the chlorophylla/b ratio was not affected. The leaves of var.borealis were no less frost tolerant than those of var.japonica. In spite of the difference in environmental factors, both varieties had similar characteristics in seasonal changes of photosynthesis, respiration and chlorophylla/b ratio. These results suggest that var.japonica could survive in areas with heavy snow where it does not normally occur. Leaf net production (LNP) was estimated based on the microclimatic data and seasonal photosynthetic and respiration rates. The difference in the annual LNP between the two varieties was equivalent to the difference in the LNP during the snow season. One of the major effects of snow cover is to interrupt and reduce the production period of var.borealis.

Key words

Aucuba japonicaphotosynthesisSea of Japanshadingsnow cover
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Copyright information

© Ecological Society of Japan 1993