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Oecologia

, Volume 135, Issue 2, pp 280–287 | Cite as

Warming effects on growth, production, and vegetation structure of alpine shrubs: a five-year experiment in northern Japan

  • Gaku KudoEmail author
  • Shizuo Suzuki
Ecosystem Ecology

Abstract

Warming effects on shoot growth, production, reproductive activity, and vegetation structure of alpine shrubs were measured over 5 years in a mid-latitude alpine fellfield in northern Japan. Open-top chambers (OTC) increased the daily mean air-temperature by 1.5–2.3°C throughout the growing season but the effect on soil temperature was small. Two evergreen species, Ledum palustre and Empetrum nigrum, tended to increase their annual shoot production and aboveground-mass accumulation in the OTCs, whereas flower production did not differ. Two deciduous species, Vaccinium uliginosum and Arctous alpinus, increased their flower production in the OTCs, whereas the vegetative growth and mass accumulation did not change. No significant differences in vegetative and flower production were detected in Vaccinium vitis-idaea between the OTCs and control plots. The shoot survival and growth in terms of height of most species increased in the OTCs relative to the control treatment, and the growth rate was significantly different among species. As a result, interspecific competition seemed to be accelerated in the OTCs, and the less competitive V. vitis-idaea was suppressed by other plant species. The response to the warming observed in this study was rather different from that seen in arctic and subarctic plants even within the same species, indicating that the warming effect may cause different responses between arctic and mid-latitude alpine ecosystems. We concluded that the artificial warming over 5 years accelerated the growth of a few restricted species and lead to the change in vegetation structure in the mid-latitude alpine ecosystem.

Keywords

Artificial warming Biomass Flowering Plant height Survival 

Notes

Acknowledgements

We thank Tetsuya Kasagi and Yoshiko Shimono for their assistance. Comments by Naoya Wada, Ulf Molau, and two anonymous reviewers highly improved the manuscript. This study was partly supported by the Sumitomo Foundation.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Graduate School of Environmental Earth ScienceHokkaido UniversitySapporoJapan

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