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首页> 外文会议>Conference on Ultraviolet Ground- and Space-based Measurements, Models, and Effects, Jul 30-Aug 1, 2001, San Diego, USA >Modeling Ultraviolet-B Radiation in a Maize Canopy
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Modeling Ultraviolet-B Radiation in a Maize Canopy

机译：玉米冠层中紫外线B辐射的建模

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摘要

A decrease in stratospheric ozone may result in a serious threat to plants, since biologically active short-wavelength ultraviolet-B (UV-B 280-320 nm) radiation will increase even with a relatively small decrease in ozone. Experimental work has shown that various cultivars and species respond to UV-B in different ways. To determine the physiological effects on plants of any increases in UV-B radiation, the irradiances at the potential sensitive plant surface need to be known. Numerical models are needed to calculate UV-B irradiance. This paper compares spatially and temporally averaged measurements of UV-B canopy transmittance (T_(canopy), irradiance below canopy/irradiance above canopy) to that predicted by three models. Maize was selected as the canopy for the study because direct measurements of leaf area and leaf angle distribution are manageable. The models can be applied to other plants including urban trees, though other methods of characterizing leaf area and angle distributions generally would be used. Using measurements of canopy parameters as inputs to the numerical scheme, the models attempt to simulate the UV-B_( Tcanopy) that the UV-B sensors measure. The purpose of this paper is: (1) to describe the models developed for calculating UV-B irradiances (as measured by UV-B T_(canopy)) at given positions in maize canopies; and (2) to report the results of experimental tests of the models.
机译：平流层臭氧的减少可能会对植物造成严重威胁，因为具有生物活性的短波紫外线B（UV-B 280-320 nm）辐射即使在臭氧减少相对较小的情况下也会增加。实验工作表明，各种品种和物种对UV-B的反应方式不同。为了确定任何UV-B辐射增加对植物的生理影响，需要知道潜在敏感植物表面的辐照度。需要数值模型来计算UV-B辐照度。本文将UV-B冠层透射率（T_（冠层），冠层以下辐照度/冠层以上辐照度）的空间和时间平均测量结果与三个模型所预测的进行了比较。选择玉米作为该研究的冠层是因为直接测量叶面积和叶角度分布是可控的。该模型可以应用于包括城市树木在内的其他植物，尽管通常会使用其他表征叶面积和角度分布的方法。使用冠层参数的测量值作为数值方案的输入，这些模型试图模拟UV-B传感器测量的UV-B_（Tcanopy）。本文的目的是：（1）描述为计算玉米冠层给定位置的UV-B辐照度（通过UV-B T_（冠层）测量）而开发的模型； （2）报告模型的实验测试结果。

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