Universidad de La Rioja, Complejo Científico-Tecnológico, Avda. Madre de Dios 51, 26006 Logroño, La Rioja, Spain.
Environ Pollut. 2009 Aug-Sep;157(8-9):2335-44. doi: 10.1016/j.envpol.2009.03.025. Epub 2009 Apr 10.
We analyzed bulk UV absorbance of methanolic extracts and levels of five UV-absorbing compounds (hydroxycinnamic acid derivatives) in 135 herbarium samples of the liverwort Jungermannia exsertifolia subsp. cordifolia from northern Europe. Samples had been collected in 1850-2006 (96% in June-August). Both UV absorbance and compound levels were correlated positively with collection year. p-Coumaroylmalic acid (C1) was the only compound showing a significant (and negative) correlation with stratospheric ozone and UV irradiance in the period that real data of these variables existed. Stratospheric ozone reconstruction (1850-2006) based on C1 showed higher values in June than in July and August, which coincides with the normal monthly variation of ozone. Combining all the data, there was no long-term temporal trend from 1850 to 2006. Reconstructed UV showed higher values in June-July than in August, but again no temporal trend was detected in 1918-2006 using the joint data. This agrees with previous UV reconstructions.
我们分析了来自北欧的 135 份石松科植物标本（扭叶石松亚种）的甲醇提取物的吸光度和 5 种紫外线吸收化合物（羟基肉桂酸衍生物）的含量。这些样本采集于 1850 年至 2006 年（96%在 6 月至 8 月采集）。吸光度和化合物含量都与采集年份呈正相关。对甲氧基肉桂酰基苹果酸（C1）是唯一一种与平流层臭氧和紫外线辐射在存在实际数据的时期呈显著（负）相关的化合物。基于 C1 的平流层臭氧重建（1850-2006 年）显示 6 月的臭氧浓度高于 7 月和 8 月，这与臭氧的正常月度变化一致。综合所有数据，1850 年至 2006 年期间没有长期的时间趋势。结合所有数据，6 月至 7 月的紫外线辐射值高于 8 月，但在 1918 年至 2006 年期间，使用联合数据并未检测到时间趋势。这与之前的紫外线重建结果一致。
