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Ozone exposure affects tree defoliation in a continental climate

机译:在大陆性气候下,臭氧暴露会影响树木的落叶

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摘要

Ground-level ozone (03) affects trees through visible leaf injury, accelerating leaf senescence, declining foliar chlorophyll content, photosynthetic activity, growth, carbon sequestration, predisposing to pests attack and a variety of other physiological effects. Tree crown defoliation is one of the most important parameters that is representative of forest health and vitality. Effects of air pollution on forests have been investigated through manipulative experiments that are not representative of the real environmental conditions observed in the field. In this work we investigated the role of O_3 concentration and other metrics (AOT40 and PODO) in affecting crown defoliation in temperate Romanian forests. The impacts of O_3 were estimated in combination with nitrogen pollutants, climatic factors and orographic conditions, by applying a non-linear modelling approach (Random Forest and Generalised Regression Models). Ozone concentration and AOT40 under Romanian conditions were more important than meteorological parameters in affecting crown defoliation. In these particular conditions, PODO never exceeded the critical level suggested by previous literature for forest protection, and thus was not important in affecting crown defoliation.
机译:地面臭氧(03)通过可见的叶片伤害,加速叶片衰老,降低叶绿素含量,光合活性,生长,固碳,易受害虫侵袭和多种其他生理效应影响树木。树冠脱叶是代表森林健康和生命力的最重要参数之一。通过操纵性实验研究了空气污染对森林的影响,这些实验不能代表在野外观察到的真实环境条件。在这项工作中,我们调查了O_3浓度和其他指标(AOT40和PODO)在影响罗马尼亚温带森林冠冕落叶中的作用。通过应用非线性建模方法(随机森林和广义回归模型),结合氮污染物,气候因素和地形条件,估算了O_3的影响。罗马尼亚条件下的臭氧浓度和AOT40在影响冠叶脱落方面比气象参数更重要。在这些特殊条件下,PODO从未超过先前文献所建议的森林保护临界水平,因此在影响树冠脱叶方面并不重要。

著录项

  • 来源
    《The Science of the Total Environment》 |2017年第15期|396-404|共9页
  • 作者单位

    ENEA, CR Casaccio, SSFT-ΜΠ-ΙΝΑΤ. Via Anguillarese 301,00123 Rome, Italy;

    Department of Environmental Biology, Sapienza University of Rome, Piazzate Aldo Moro, 5,00185 Rome, Italy;

    National Institute for Research and Development in Forestry Marin Dracea, Eroilor Blvd. 128, Voluntan, Ilfov, Romania;

    University of Exeter, College of Engineering, Mathematics and Physical Sciences, Exeter, UK,CNR, Via Madonna del Piano, Sesto Fiorentino, Florence, Italy;

    National Institute for Research and Development in Forestry Marin Dracea, Eroilor Blvd. 128, Voluntan, Ilfov, Romania,Transilvania University o/Brasov, Romania;

    National Institute for Research and Development in Forestry Marin Dracea, Eroilor Blvd. 128, Voluntan, Ilfov, Romania;

    National Institute for Research and Development in Forestry Marin Dracea, Eroilor Blvd. 128, Voluntan, Ilfov, Romania;

    ENEA, CR Casaccio, SSFT-ΜΠ-ΙΝΑΤ. Via Anguillarese 301,00123 Rome, Italy;

    CNR, Via Madonna del Piano, Sesto Fiorentino, Florence, Italy;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Air pollution impacts; Crown transparency; Stomatal ozone uptake; Forests; General regression models;

    机译:空气污染影响;皇冠透明度;气孔臭氧吸收;森林;通用回归模型;
  • 入库时间 2022-08-17 13:49:09

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