在Cryptomeria japonica的树冠内,针状臭氧吸收的垂直梯度
Ryoji Tanaka1, Kenta Kawamata2, Miyu Urashima2
1United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan.
Environmental research
|June 22, 2024
概括
叶子吸收臭氧是树木风险评估的一个关键因素,在树冠内显示了垂直梯度. 这项研究揭示了口腔导电性,而不是臭氧度,主要驱动这种梯度,对阳光照射和阴影针的光合作用产生不同的影响.
科学领域:
- 环境科学 环境科学
- 植物生理学 植物生理学
- 森林生态 森林生态
背景情况:
- 叶子的臭氧吸收对于评估臭氧对树木的风险至关重要.
- 在树冠内存在着口腔导电性和臭氧度的垂直梯度.
- 了解天花板内臭氧吸收梯度对于准确的风险评估至关重要.
研究的目的:
- 调查臭氧度的垂直梯度和口腔导电对 Cryptomeria japonica 中针头臭氧吸收的影响.
- 在森林树冠内模拟针式臭氧吸收和植物毒性臭氧剂量 (POD1).
- 分析不同臭氧度概况对臭氧吸收的影响.
主要方法:
- 采用多层气交换模型来模拟针头口腔导电性和臭氧吸收.
- 在不同的树冠层中计算累积臭氧吸收 (POD1).
- 使用各种模拟的垂直臭氧度梯度进行了灵敏度分析.
主要成果:
- 植物毒性臭氧剂量 (POD1) 从树冠的顶部到底部下降.
- POD1的下降主要是由口腔导电的垂直梯度驱动的,臭氧度变化的影响很小.
- 顶部树冠上的阴影针对整体光合作用作出了显著的贡献,尽管它们的POD1比阳光照明针的POD1低.
结论:
- 口腔导电是影响树冠内的臭氧吸收垂直梯度的主导因素.
- 臭氧可能会因不同的吸收水平而对阳光照射和阴影针产生不同的影响.
- 准确的树冠尺度臭氧吸收建模需要将这些树冠内梯度纳入,以准确预测臭氧对树木的影响.
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