Institute for Applied Plant Biology, Sandgrubenstrasse 25, CH-4124 Schönenbuch, Switzerland.
Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland.
Environ Pollut. 2014 Sep;192:129-38. doi: 10.1016/j.envpol.2014.05.016. Epub 2014 Jun 7.
The estimate of growth losses by ozone exposure of forest trees is a significant part in current C sequestration calculations and will also be important in future modeling. It is therefore important to know if the relationship between ozone flux and growth reduction of young trees, used to derive a Critical Level for ozone, is also valid for mature trees. Epidemiological analysis of stem increment data from Fagus sylvatica L. and Picea abies Karst. observed in Swiss forest plots was used to test this hypothesis. The results confirm the validity of the flux-response relationship at least for beech and therefore enable estimating forest growth losses by ozone on a country-wide scale. For Switzerland, these estimates amount to 19.5% growth reduction for deciduous forests, 6.6% for coniferous forests and 11.0% for all forested areas based on annual ozone stomatal uptake during the time period 1991-2011.
臭氧暴露对森林树木生长损失的估计是当前碳封存计算的重要组成部分，在未来的建模中也将很重要。因此，重要的是要知道，用于推导臭氧临界水平的幼树臭氧通量与生长减少之间的关系是否也适用于成熟树木。利用从瑞士森林样地中观测到的欧洲山毛榉和欧洲云杉的茎增量数据进行的流行病学分析，检验了这一假设。结果证实了通量-响应关系的有效性，至少对山毛榉是如此，因此能够估算全国范围内的臭氧对森林生长的损失。基于 1991-2011 年期间的臭氧气孔吸收量，瑞士落叶林的生长损失估计为 19.5%，针叶林为 6.6%，所有森林地区为 11.0%。
