Growth and Leaf Gas Exchange in Three Birch Species Exposed to Elevated Ozone and CO2 in Summer

• Hoshika, Yasutomo

• Watanabe, Makoto

• Inada, Naoki

• Koike, Takayoshi

抄録

We examined the effects of ozone and elevated CO2 concentration in summer on the growth and photosynthetic traits of three representative birch species in Japan (mountain birch, Monarch birch, and white birch). Seedlings of the three birch species were grown in 16 open-top chambers and were exposed to two levels of ozone (6 nmol mol^[-1] and 60 nmol mol^[-1] for 7 h per day) in combination with two levels of CO2 (370-380μmol mol^[-1] and 600 μmol mol^[-1] for daytime) from July to October. No adverse effects of ozone were found in the Monarch birch or the white birch, but elevated ozone in summer reduced branch biomass and net photosynthesis, and accelerated leaf abscission, in the mountain birch. Elevated CO2 promoted root development and thereby reduced the ratio of shoot dry mass (stem + branch) to root dry mass (S/R ratio) in the mountain birch and white birch. In contrast, there was no difference in dry mass between ambient and elevated CO2 for the Monarch birch, due to downregulation of photosynthesis. Studies of the combined effect of CO2 and ozone revealed that elevated CO2 did not ameliorate the effect of ozone on mountain birch in late summer. In considering the ameliorating effect of CO2 on ozone damage, it is necessary to take account of the species and the season.

収録刊行物

• Water, Air, & Soil Pollution

  Water, Air, & Soil Pollution 223 (8), 5017-5025, 2012-09

  Springer Netherlands

キーワード

• Compensative effects
• Tropospheric ozone
• Elevated CO2
• Birch
• Photosynthesis

詳細情報

• CRID: 1050845763942115328
• NII論文ID: 120004857008
• HANDLE: 2115/50360
• ISSN: 00496979
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles