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Growth overcompensation against O3 exposure in two Japanese oak species, Quercus mongolica var. crispula and Quercus serrata, grown under elevated CO2
- Kitao, Mitsutoshi, Komatsu, Masabumi, Yazaki, Kenichi, Kitaoka, Satoshi, Tobita, Hiroyuki
- Environmental pollution 2015 v.206 pp. 133-141
- Quercus mongolica, Quercus serrata, carbon dioxide, carbon dioxide enrichment, dry matter partitioning, gas exchange, growing season, indigenous species, leaves, ozone, photosynthesis, root growth, seedlings, East Asia
- To assess the effects of elevated concentrations of carbon dioxide (CO2) and ozone (O3) on the growth of two mid-successional oak species native to East Asia, Quercus mongolica var. crispula and Quercus serrata, we measured gas exchange and biomass allocation in seedlings (initially 1-year-old) grown under combinations of elevated CO2 (550 μmol mol−1) and O3 (twice-ambient) for two growing seasons in an open-field experiment in which root growth was not limited. Both the oak species showed a significant growth enhancement under the combination of elevated CO2 and O3 (indicated by total dry mass; over twice of ambient-grown plants, p < .05), which probably resulted from a preferable biomass partitioning into leaves induced by O3 and a predominant enhancement of photosynthesis under elevated CO2. Such an over-compensative response in the two Japanese oak species resulted in greater plant growth under the combination of elevated CO2 and O3 than elevated CO2 alone.