caa a22 4500 445383984 CHVBK 20180317143026.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10021-011-9481-3 doi (NATIONALLICENCE)springer-10.1007/s10021-011-9481-3 The Carbon Balance of Two Contrasting Mountain Forest Ecosystems in Switzerland: Similar Annual Trends, but Seasonal Differences [Elektronische Daten] [Sophia Etzold, Nadine Ruehr, Roman Zweifel, Matthias Dobbertin, Andreas Zingg, Peter Pluess, Rudolf Häsler, Werner Eugster, Nina Buchmann] Net ecosystem exchange (NEE) of two contrasting mountain forest types in Switzerland was measured by eddy covariance (EC) measurements at a montane mixed forest, the Lägeren forest, over 5 years (2005-2009), and at a subalpine coniferous forest, the Seehornwald in Davos, over 12years (1997-2009). NEE was validated against annual carbon (C) storage estimates, based on biometric and soil respiration measurements as well as soil C modeling. Three different approaches were used: (1) calculation of net ecosystem production by quantifying C pools and fluxes, (2) assessment of change in wood biomass and soil C storage (ΔC), and (3) application of biomass expansion factors. Although biometric estimates were sensitive to assumptions made for each method applied, they agreed well with measured NEE. Comparing 5years of EC measurements available at both sites during 2005 and 2009 revealed that NEE, gross primary production (GPP), and total ecosystem respiration (TER) were larger at the Lägeren forest compared to the Davos forest, whereas soil respiration and soil C sequestration were of similar magnitudes. Both sites showed similar annual trends for NEE, GPP and TER, but different seasonal courses, due to different responses to environmental conditions (temperature, soil moisture, and radiation). Differences in the magnitude as well as in the seasonality of ecosystem CO2 exchange could mainly be attributed to tree phenology, productivity, and carbon allocation patterns, which are combined effects of tree type (broad-leaved vs. coniferous trees) and site-specific climatic conditions. Flux differences between the two mountain sites highlight the importance of considering the role of altitude in ecological studies and modeling. Springer Science+Business Media, LLC, 2011 biometric inventory nationallicence eddy covariance nationallicence mountain forest nationallicence NEE nationallicence NEP nationallicence soil respiration nationallicence soil carbon sequestration nationallicence modeling nationallicence Etzold Sophia Institute of Agricultural Sciences, ETH Zürich, 8092, Zurich, Switzerland aut Ruehr Nadine Department of Forest Ecosystems & Society, Oregon State University, 97331, Corvallis, Oregon, USA aut Zweifel Roman Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland aut Dobbertin Matthias Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland aut Zingg Andreas Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland aut Pluess Peter Institute of Agricultural Sciences, ETH Zürich, 8092, Zurich, Switzerland aut Häsler Rudolf Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland aut Eugster Werner Institute of Agricultural Sciences, ETH Zürich, 8092, Zurich, Switzerland aut Buchmann Nina Institute of Agricultural Sciences, ETH Zürich, 8092, Zurich, Switzerland aut Ecosystems Springer-Verlag 14/8(2011-12-01), 1289-1309 1432-9840 14:8<1289 2011 14 10021 https://doi.org/10.1007/s10021-011-9481-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-011-9481-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Etzold Sophia Institute of Agricultural Sciences, ETH Zürich, 8092, Zurich, Switzerland aut NATIONALLICENCE 700 1- Ruehr Nadine Department of Forest Ecosystems & Society, Oregon State University, 97331, Corvallis, Oregon, USA aut NATIONALLICENCE 700 1- Zweifel Roman Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland aut NATIONALLICENCE 700 1- Dobbertin Matthias Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland aut NATIONALLICENCE 700 1- Zingg Andreas Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland aut NATIONALLICENCE 700 1- Pluess Peter Institute of Agricultural Sciences, ETH Zürich, 8092, Zurich, Switzerland aut NATIONALLICENCE 700 1- Häsler Rudolf Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland aut NATIONALLICENCE 700 1- Eugster Werner Institute of Agricultural Sciences, ETH Zürich, 8092, Zurich, Switzerland aut NATIONALLICENCE 700 1- Buchmann Nina Institute of Agricultural Sciences, ETH Zürich, 8092, Zurich, Switzerland aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/8(2011-12-01), 1289-1309 1432-9840 14:8<1289 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer