A biological spectral weighting function for ozone depletion research with higher plants
A biological spectral weighting function for ozone depletion research with higher plants
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DOI：
10.1034/j.1399-3054.2003.1170117.x
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发表时间：
2003-01-01
影响因子：
6.4
通讯作者：
Caldwell, MM
中科院分区：
文献类型：
--
作者：
Flint, SD;Caldwell, MM
生物光谱加权函数在评估平流层臭氧减少的影响方面发挥着关键作用。它们被用来计算由于臭氧减少而增加的生物有效太阳紫外线辐射（辐射放大系数），评估目前太阳紫外线辐射的纬度梯度，并将太阳紫外线辐射与实验中使用的灯和过滤器的辐射进行比较。在此基础上，建立了光生燕麦（A vena sativa L.）CV. Otana）幼苗暴露于来自大型双水棱镜单色仪的窄带UV辐射。在不存在任何可见辐射的情况下，使用五个UV波长峰（275、297、302、313和366 nm）。在处理后1至10天测量生长反应。在所有这些波长下，紫外线辐射抑制高度生长，包括第一片叶子从茎分离的高度。除了一个UV-A波长外，所有波长的辐射都促进了第二片叶的长度。由此产生的行动光谱非常类似于常用的广义植物响应函数，除了它表明持续的敏感性到UV-A区域。当用作臭氧消耗问题的生物学指标时，这一植物生长的新功能将表明臭氧消耗的影响大大减少，因为它只会导致特定臭氧消耗水平（较低的RAF）的生物有效紫外线的适度增加。然而，这一新的BDEs也表明，基于以前的BDEs的实验处理，不太强调UV-A，可能导致模拟的臭氧消耗比预期的要小。在田间试验中验证了这种新的具有UV-A敏感性的植物生长加权函数的有效性。
Biological spectral weighting functions (BSWF) play a key role in assessing implications of stratospheric ozone reduction. They are used to calculate the increase in biologically effective solar UV radiation due to ozone reduction (radiation amplification factor, RAF), assess current latitudinal gradients of solar UV radiation, and compare solar UV radiation with that from lamps and filters used in experiments. As a basis for a BSWF, we developed an action spectrum for growth responses of light-grown oat (A vena sativa L. cv. Otana) seedlings exposed to narrowband UV radiation from a large double water-prism monochromator. Five UV wavelength peaks were used (275, 297, 302, 313 and 366 nm) in the absence of any visible radiation. Growth responses were measured from 1 to 10 days after the treatments. At all these wavelengths, the UV radiation inhibited height growth, including the height at which the first leaf separated from the stem. Radiation at all wavelengths used, except the one UV-A wavelength, promoted the length of the second leaf. The resulting action spectrum closely resembles the commonly used generalized plant response function except that it indicates continued sensitivity into the UV-A region. When used as a BSWF for the ozone depletion problem, this new function for plant growth would suggest substantially less impact of ozone depletion because it results in only a modest increment of biologically effective UV for a given level of ozone depletion (a lower RAF). Yet this new BSWF also suggests that experimental treatments based on previous BSWF with less emphasis on the UV-A may have resulted in simulations of less pronounced ozone depletion than intended. The validity of this new BSWF with UV-A sensitivity, designated the UV plant growth weighting function, was verified in field experiments as described in the companion paper.