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The transpiration of oak-savannas in southern Spain was modelled by scaling-up from the leaf to the tree during a drought period. Two characteristics of this ecosystem were found to facilitate the modelling procedure. The first was a near-zero decoupling coefficient between the surface and the...
Projected future climate change scenarios derived from two General Circulation Models (GCMs): Geophysical Fluid Dynamics Laboratory (GFDL) and United Kingdom Meteorological Office (UKMO), and two crop models: Crop Estimation through Resources and Environmental Synthesis (CERES), and...
Heat units, expressed in growing degree-days (GDD), are frequently used to describe the timing of biological processes. The basic equation used is GDD = ( (T MAX + T MIN ) 2 )−T BASE , where T MAX and T MIN are daily maximum and minimum air temperature, respectively, and T BASE is the base...
In this work, a study was carried out to develop and evaluate several methods for estimating the daily vapor pressure deficit (VPD) at thermo-pluviometric stations (weather stations in which only temperature and precipitation are measured) located in a region with a homogeneous climate where...
Solar radiation and air temperature near the soil surface and soil temperatures were measured from 15 June to 6 September 1993 in a 100m × 150m clear-cut, an 18m × 150m east-west strip, a 9m × 150m east-west strip, a circle of 18m diameter, a circle of 9m diameter, and a closed canopy...
The objective of this study was to measure the CO 2 fluxes from forest soils by the 222 Rn calibrated method and the static chamber method, and to discuss the differences between the methods. Determination of the diffusion coefficient of CO 2 in soil, D CO 2 , by the 222 Rn method allowed us to...
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