Isoprene emission from a subarctic peatland under enhanced UV-B radiation.
Isoprene emission from a subarctic peatland under enhanced UV-B radiation.
复制标题
在增强的 UV-B 辐射下亚北极泥炭地的异戊二烯排放。
DOI：
10.1111/j.1469-8137.2007.02164.x
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
J. Holopainen
中科院分区：
文献类型：
--
作者：
Päivi Tiiva;R. Rinnan;P. Faubert;Janne V. Räsänen;T. Holopainen;E. Kyrö;J. Holopainen
异戊二烯是一种活性碳氢化合物，在大气化学中具有重要作用，而植被的排放有助于大气碳通量。北极泥炭地的异戊二烯排放量尚不清楚，可能会因紫外线-B辐射的增加而改变。异戊二烯的排放量进行了测量与动态室的方法从亚北极泥炭地下的长期增强的UV-B辐射的目标对应于平流层臭氧层中的20%的损失。泥炭地的立地类型是以苔藓Warnstorfia exannulata和莎草Eriophorum russeland和苔草为主的斑块沼泽。物种密度和排放之间的关系进行了评估。异戊二烯的排放量显着增加增强UV-B辐射在第二（2004年）和第四（2006年）生长季节下的UV-B暴露。排放量与E.俄罗斯人优势藓类为W. exannulata在实验室试验中被证明排放少量的异戊二烯。即使没有泥炭藓，亚北极沼泽也是大气中异戊二烯的重要来源，特别是在温暖的天气下。北极变暖加上紫外线-B辐射增强可能会大大增加排放量。
Isoprene is a reactive hydrocarbon with an important role in atmospheric chemistry, and emissions from vegetation contribute to atmospheric carbon fluxes. The magnitude of isoprene emissions from arctic peatlands is not known, and it may be altered by increasing UV-B radiation. Isoprene emission was measured with the dynamic chamber method from a subarctic peatland under long-term enhancement of UV-B radiation targeted to correspond to a 20% loss in the stratospheric ozone layer. The site type of the peatland was a flark fen dominated by the moss Warnstorfia exannulata and sedges Eriophorum russeolum and Carex limosa. The relationship between species densities and the emission was also assessed. Isoprene emissions were significantly increased by enhanced UV-B radiation during the second (2004) and the fourth (2006) growing seasons under the UV-B exposure. Emissions were related to the density of E. russeolum. The dominant moss, W. exannulata, proved to emit small amounts of isoprene in a laboratory trial. Subarctic fens, even without Sphagnum moss, are a significant source of isoprene to the atmosphere, especially under periods of warm weather. Warming of the Arctic together with enhanced UV-B radiation may substantially increase the emissions.