Department of Biology, Research Group of Plant and Vegetation Ecology, University of Antwerp, Wilrijk, Belgium; Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK.
Environ Pollut. 2014 Jan;184:201-10. doi: 10.1016/j.envpol.2013.08.032. Epub 2013 Sep 21.
Tropospheric O3 is a strong oxidant that may affect vegetation and human health. Here we report on the O3 fluxes from a poplar plantation in Belgium during one year. Surprisingly, the winter and autumn O3 fluxes were of similar magnitude to ones observed during most of the peak vegetation development. Largest O3 uptakes were recorded at the beginning of the growing season in correspondence to a minimum stomatal uptake. Wind speed was the most important control and explained 44% of the variability in the nighttime O3 fluxes, suggesting that turbulent mixing and the mechanical destruction of O3 played a substantial role in the O3 fluxes. The stomatal O3 uptake accounted for a seasonal average of 59% of the total O3 uptake. Multiple regression and partial correlation analyses showed that net ecosystem exchange was not affected by the stomatal O3 uptake.
对流层臭氧是一种强氧化剂，可能会影响植被和人类健康。本研究报告了比利时一个人工杨树林在一年间的臭氧通量。令人惊讶的是，冬季和秋季的臭氧通量与大多数植被生长高峰期观测到的通量相当。最大的臭氧吸收发生在生长季节开始时，与最小的气孔吸收相对应。风速是最重要的控制因素，解释了夜间臭氧通量变化的 44%，表明湍流混合和臭氧的机械破坏在臭氧通量中起了重要作用。气孔臭氧吸收占总臭氧吸收的季节性平均值的 59%。多元回归和偏相关分析表明，净生态系统交换不受气孔臭氧吸收的影响。
