caa a22 4500 445384069 CHVBK 20180317143026.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10021-011-9478-y doi (NATIONALLICENCE)springer-10.1007/s10021-011-9478-y Afforestation of Tropical Pasture Only Marginally Affects Ecosystem-Scale Evapotranspiration [Elektronische Daten] [Sebastian Wolf, Werner Eugster, Sonja Majorek, Nina Buchmann] Evapotranspiration (ET) from tropical ecosystems is a major constituent of the global land-atmosphere water flux and strongly influences the global hydrological cycle. Most previous studies of ecosystem ET have been conducted predominantly in tropical forests, and only few observations cover other tropical land-use types such as pastures, croplands, savannas or plantations. The objectives of our study were: (1) to estimate daily, monthly, and annual ET budgets in a tropical pasture and an adjacent afforestation site, (2) to assess diurnal and seasonal patterns of ET, (3) to investigate environmental controls of ET, and (4) to evaluate the soil infiltration potential. We performed eddy covariance measurements of ecosystem ET in Sardinilla (Panama) from 2007 to 2009. Daily ET (2.6±1.0mmday−1) was significantly lower in the pasture compared to the afforestation site (3.0±0.9mmday−1). The highest ET was observed during the wet-dry transition period in both ecosystems. However, differences in daily ET between sites were relatively small, particularly during the wet season. Radiation was the main environmental control of ET at both sites, however, we observed considerable seasonal variation in the strength of this control, which was stronger during the wet compared to the dry season. In 2008, total annual ET was only slightly higher for the afforestation (1114mmy−1) than the pasture site (1034mmy−1). Our results suggest that afforestation of pasture only marginally increases ecosystem-scale ET 6-8years after establishment. Differences in soil infiltration potentials between our sites seem to explain this pattern. Springer Science+Business Media, LLC, 2011 Eddy covariance nationallicence water fluxes nationallicence water budget nationallicence evaporation nationallicence soil infiltration potential nationallicence Panama nationallicence FLUXNET nationallicence Wolf Sebastian Institute of Agricultural Sciences, ETH Zurich, Universitaetsstrasse 2, 8092, Zurich, Switzerland aut Eugster Werner Institute of Agricultural Sciences, ETH Zurich, Universitaetsstrasse 2, 8092, Zurich, Switzerland aut Majorek Sonja Institute of Agricultural Sciences, ETH Zurich, Universitaetsstrasse 2, 8092, Zurich, Switzerland aut Buchmann Nina Institute of Agricultural Sciences, ETH Zurich, Universitaetsstrasse 2, 8092, Zurich, Switzerland aut Ecosystems Springer-Verlag 14/8(2011-12-01), 1264-1275 1432-9840 14:8<1264 2011 14 10021 https://doi.org/10.1007/s10021-011-9478-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-011-9478-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wolf Sebastian Institute of Agricultural Sciences, ETH Zurich, Universitaetsstrasse 2, 8092, Zurich, Switzerland aut NATIONALLICENCE 700 1- Eugster Werner Institute of Agricultural Sciences, ETH Zurich, Universitaetsstrasse 2, 8092, Zurich, Switzerland aut NATIONALLICENCE 700 1- Majorek Sonja Institute of Agricultural Sciences, ETH Zurich, Universitaetsstrasse 2, 8092, Zurich, Switzerland aut NATIONALLICENCE 700 1- Buchmann Nina Institute of Agricultural Sciences, ETH Zurich, Universitaetsstrasse 2, 8092, Zurich, Switzerland aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/8(2011-12-01), 1264-1275 1432-9840 14:8<1264 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer