Increased phytotoxic O3 dose accelerates autumn senescence in an O3-sensitive beech forest even under the present-level O3
書誌事項
- 公開日
- 2016-09-07
- 権利情報
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- https://creativecommons.org/licenses/by/4.0
- https://creativecommons.org/licenses/by/4.0
- DOI
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- 10.1038/srep32549
- 公開者
- Springer Science and Business Media LLC
説明
<jats:title>Abstract</jats:title><jats:p>Ground-level ozone (O<jats:sub>3</jats:sub>) concentrations are expected to increase over the 21<jats:sup>st</jats:sup> century, especially in East Asia. However, the impact of O<jats:sub>3</jats:sub> has not been directly assessed at the forest level in this region. We performed O<jats:sub>3</jats:sub> flux-based risk assessments of carbon sequestration capacity in an old cool temperate deciduous forest, consisting of O<jats:sub>3</jats:sub>-sensitive Japanese beech (<jats:italic>Fagus crenata</jats:italic>), and in a warm temperate deciduous and evergreen forest dominated by O<jats:sub>3</jats:sub>-tolerant Konara oak (<jats:italic>Quercus serrata</jats:italic>) based on long-term CO<jats:sub>2</jats:sub> flux observations. On the basis of a practical approach for a continuous estimation of canopy-level stomatal conductance (G<jats:sub>s</jats:sub>), higher phytotoxic ozone dose above a threshold of 0 uptake (POD0) with higher G<jats:sub>s</jats:sub> was observed in the beech forest than that in the oak forest. Light-saturated gross primary production, as a measure of carbon sequestration capacity of forest ecosystem, declined earlier in the late growth season with increasing POD0, suggesting an earlier autumn senescence, especially in the O<jats:sub>3</jats:sub>-sensitive beech forest, but not in the O<jats:sub>3</jats:sub>-tolerant oak forest.</jats:p>
収録刊行物
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- Scientific Reports
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Scientific Reports 6 (1), 1-, 2016-09-07
Springer Science and Business Media LLC
