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Climate Change, Air Pollution and Global Challenges
Pierre DizengremelYves JolivetAndrée TuzetAnnamaria RanieriDidier Le Thiec
其他書名
Chapter 13. Integrative Leaf-Level Phytotoxic Ozone Dose Assessment for Forest Risk Modelling
出版Elsevier Inc. Chapters, 2013-11-19
主題Nature / Plants / TreesScience / Environmental ScienceScience / Life Sciences / Botany
ISBN01280556509780128055656
URLhttp://books.google.com.hk/books?id=ATRzDAAAQBAJ&hl=&source=gbs_api
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註釋Ozone is a phytotoxic air pollutant, impairing photosynthesis and reducing plant growth. The predicted increase in tropospheric ozone concentration could lead to an increased vulnerability of forests, mitigating carbon sink strength of vegetation under the increasing atmospheric CO2 concentration. To improve European risk indices, currently based on atmospheric O3 concentration (i.e. O3 exposure), it is necessary to assess the phytotoxic ozone dose, reflecting the balance between stomatal ozone uptake and detoxification capacity of foliar cells. Advancing knowledge on plant response mechanisms would allow for integrating a sub-model into global ozone impact prediction models towards consolidating process-based indices for risk assessment. Crucial parameters are (i) stomatal characteristics, (ii) constitutive detoxification potential, (iii) capacity for antioxidant regeneration and (iv) cellular redox power. The combination of ozone with other impacting factors (drought, high temperature and CO2) will be discussed in view of the challenge of scaling tree-level ozone responses to the forest ecosystem level under conditions of climate change.