Noe Steffen M, Kimmel Veljo, Hüve Katja, Copolovici Lucian, Portillo-Estrada Miguel, Püttsepp Ulle, Jõgiste Kalev, Niinemets Ulo, Hörtnagl Lukas, Wohlfahrt Georg
Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, EE-51014 Tartu Estonia.
Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 1, EE-51014 Tartu Estonia.
For Ecol Manage. 2011 Jul 15;262(2):71-81. doi: 10.1016/j.foreco.2010.09.013.
During two measurement campaigns, from August to September 2008 and 2009, we quantified the major ecosystem fluxes in a hemiboreal forest ecosystem in Järvselja, Estonia. The main aim of this study was to separate the ecosystem flux components and gain insight into the performance of a multi-species multi-layered tree stand. Carbon dioxide and water vapor fluxes were measured using the eddy covariance method above and below the canopy in conjunction with the microclimate. Leaf and soil contributions were quantified separately by cuvette and chamber measurements, including fluxes of carbon dioxide, water vapor, nitrogen oxides, nitrous oxide, methane, ozone, sulfur dioxide, and biogenic volatile organic compounds (isoprene and monoterpenes). The latter have been as well characterized for monoterpenes in detail. Based on measured atmospheric trace gas concentrations, the flux tower site can be characterized as remote and rural with low anthropogenic disturbances. Our results presented here encourage future experimental efforts to be directed towards year round integrated biosphere-atmosphere measurements and development of process-oriented models of forest-atmosphere exchange taking the special case of a multi-layered and multi-species tree stand into account. As climate change likely leads to spatial extension of hemiboreal forest ecosystems a deep understanding of the processes and interactions therein is needed to foster management and mitigation strategies.
在2008年8月至9月以及2009年的两次测量活动中，我们对爱沙尼亚耶尔韦塞尔亚半北方森林生态系统中的主要生态系统通量进行了量化。本研究的主要目的是分离生态系统通量成分，并深入了解多物种多层林分的性能。利用涡度相关法结合小气候，在树冠层上方和下方测量了二氧化碳和水汽通量。通过比色皿和气室测量分别量化了叶片和土壤的贡献，包括二氧化碳、水汽、氮氧化物、一氧化二氮、甲烷、臭氧、二氧化硫和生物源挥发性有机化合物（异戊二烯和单萜）的通量。后者对单萜也进行了详细表征。根据测量的大气痕量气体浓度，通量塔站点可被表征为受人为干扰较小的偏远农村地区。我们在此展示的结果鼓励未来的实验工作朝着全年综合的生物圈-大气测量以及考虑多层多物种林分特殊情况的森林-大气交换过程导向模型的开发方向进行。由于气候变化可能导致半北方森林生态系统的空间扩展，因此需要深入了解其中的过程和相互作用，以促进管理和缓解策略的制定。
