Assessment and up-scaling of CO2 exchange by patches of the herbaceous vegetation mosaic in a Portuguese cork oak woodland

Aires, 2008, Carbon dioxide exchange above a Mediterranean C3/C4 grassland during two climatologically contrasting years, Global Change Biol., 14, 539, 10.1111/j.1365-2486.2007.01507.x Allard, 2007, The role of grazing management for the net biome productivity and greenhouse gas budget (CO2, N2O and CH4) of semi-natural grassland, Agric. Ecosyst. Environ., 121, 47, 10.1016/j.agee.2006.12.004 Ammann, 2007, The carbon budget of newly established temperate grassland depends on management intensity, Agric. Ecosyst. Environ., 121, 5, 10.1016/j.agee.2006.12.002 Aubinet, 2000, Estimates of the annual net carbon and water exchange of European forests: the EUROFLUX methodology, Adv. Ecol. Res., 30, 113, 10.1016/S0065-2504(08)60018-5 Baldocchi, 2004, How plant functional-type, weather, seasonal drought, and soil physical properties alter water and energy fluxes of an oak-grass savanna and an annual grassland, Agric. For. Meteor., 123, 13, 10.1016/j.agrformet.2003.11.006 Calanca, 2007, Simulating the fluxes of CO2 and N2O in European grasslands with the Pasture Simulation Model (PaSim), Agric. Ecosyst. Environ., 121, 164, 10.1016/j.agee.2006.12.010 David, 2004, Constraints on transpiration from an evergreen oak tree in southern Portugal, Agric. For. Meteor., 122, 193, 10.1016/j.agrformet.2003.09.014 Droesler, M., 2005. Trace gas exchange of bog ecosystems, Southern Germany. Lehrstuhl fuer Vegetationsökologie. Technische Universität München. http://www.wzw.tum.de/vegoek/publikat/dissdipl.html. FAO, 1988. FAO/UNESCO soil map of the world, revised legend, with corrections. World Resources Report 60. FAO, Rome. Reprinted as Technical paper 20. ISRIC, Wageningen, 1994. Foken, 2004, Post-field data quality control, 181 Foken, 1996, Tools for quality assessment of surface-based flux measurements, Agric. For. Meteor., 78, 83, 10.1016/0168-1923(95)02248-1 Gilmanov, 2007, Partitioning European grassland net ecosystem CO2 exchange into gross primary productivity and ecosystem respiration using light response function analysis, Agric. Ecosyst. Environ., 121, 93, 10.1016/j.agee.2006.12.008 Gilmanov, 2005, Integration of CO2 flux and remotely sensed data for primary production and ecosystem respiration analyses in the Northern Great Plains: potential for quantitative spatial extrapolation, Global Ecol. Biogeogr., 14, 271, 10.1111/j.1466-822X.2005.00151.x Gilmanov, 2003, Gross primary production and light response parameters of four Southern Plains ecosystems estimated using long-term CO2-flux tower measurements, Global Biogeochem. Cycles, 17, 1071, 10.1029/2002GB002023 Giorgi, 2006, Climate change hot-spots, Geophys. Res. Lett., 33, L08707, 10.1029/2006GL025734 Göckede, 2007, Sensitivity of Lagrangian Stochastic footprints to turbulence statistics, Tellus, 59B, 577, 10.1111/j.1600-0889.2007.00275.x Gonzalez-Bernaldez, 1969, Influences of Quercus ilex rotundifolia on the herb layer at El Pardo Madrid, Boletin de la Real Sociedad Espanola de Historia Natural, 67, 265 Grove, 2001 Joffre, 1993, Estimating tree density in oak savanna-like ‘dehesa’ of southern Spain from SPOT data, Int. J. Rem. Sens., 14, 685, 10.1080/01431169308904368 Joffre, 1988, Soil water improvement by trees in the rangelands of southern Spain, Acta Oecologica, 9, 405 Joffre, 1999, The dehesa system of southern Spain and Portugal as a natural ecosystem mimic, Agroforestry Syst., 45, 57, 10.1023/A:1006259402496 2004, 250 pp Li, 2008, Patterns in CO2 gas exchange capacity of grassland ecosystems in the Alps, Agric. For. Meteorol., 148, 51, 10.1016/j.agrformet.2007.09.002 Mauder, 2006, Impact of post-field data processing on eddy covariance flux estimates and energy balance closure, Meteorologische Zeitschrift, 15, 597, 10.1127/0941-2948/2006/0167 Montoya, J.M., 1983. Pastoralismo mediterraneo. Monografia 25. ICONA, Madrid, 162 p. Moreno, 2007, Impact of evergreen oaks on soil fertility and crop production in intercropped dehesas, Agric. Ecosyst. Environ., 119, 270, 10.1016/j.agee.2006.07.013 Owen, 2007, Comparison of seasonal changes in CO2 exchange capacity of ecosystems distributed along a north-south European transect under non-water-stressed conditions, Global Change Biol., 13, 734, 10.1111/j.1365-2486.2007.01326.x Paredes, 2006, Understanding precipitation changes in Iberia in early spring: weather typing and storm-tracking approaches, J. Hydrometeor., 7, 101, 10.1175/JHM472.1 Parker, 1982, Vegetational and environmental changes beneath isolated live oak trees (Quercus agrifolia) in a California annual grassland, Am. Midland Nat., 107, 69, 10.2307/2425189 Pereira, 2007, Effects of drought – altered seasonality and low rainfall – in net ecosystem carbon exchange of three contrasting Mediterranean ecosystems, Biogeosciences, 4, 791, 10.5194/bg-4-791-2007 Pinto-Correia, 1993, Threatened landscape in Alentejo, Portugal: the Montado and other agro-silvo pastoral systems, Landsc. Urban Plan., 24, 43, 10.1016/0169-2046(93)90081-N Reichstein, 2005, On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm, Global Change Biol., 11, 1, 10.1111/j.1365-2486.2005.001002.x Siebicke, L., 2007. Energie- und Kohlendioxidaustauschmessungen in einer Korkeichensavanne. Universität Bayreuth Abteilung Mikrometeorologie. Diplomarbeit der Geoökologie. Tang, 2005, Spatial-temporal variation of soil respiration in an oak-grass savanna ecosystem in California and its partitioning into autotrophic and heterotrophic components, Biogeochemistry, 73, 183, 10.1007/s10533-004-5889-6 Tang, 2005, Tree photosynthesis modulates soil respiration on a diurnal time scale, Global Change Biol., 11, 1298, 10.1111/j.1365-2486.2005.00978.x Tenhunen, 1987, Changes during summer drought in leaf CO2 uptake rates of macchia shrubs growing in Portugal: limitations due to photosynthetic capacity, carboxylation efficiency, and stomatal conductance, 305 Walter, 1979 Wilczak, 2001, Sonic anemometer tilt correction algorithms, Boundary-Layer Meteor., 99, 127, 10.1023/A:1018966204465 Wohlfahrt, 2005, Quantifying ecosystem respiration of a meadow using eddy covariance, chambers and modelling, Agric. For. Meteor., 128, 141, 10.1016/j.agrformet.2004.11.003 Xu, 2004, Seasonal variation in carbon dioxide exchange over a Mediterranean annual grassland in California, Agric. For. Meteorol., 123, 79, 10.1016/j.agrformet.2003.10.004