Work package no 5: Microclimate, energy budget of ecosystems
Portable battery-powered
data acquisition systems will be installed during the main growth period at
each investigation site. Profiles of soil, air and leaf temperature, of
photosynthetic photon flux density, air humidity, wind speed and CO2
concentration, within and above the canopies, as well as incoming global
radiation and net radiation will be measured and will be averaged over 60-min
periods. Soil heat flux will be estimated by a combination of the temperature
integral method for the upper and the temperature gradient method for the lower
layers of the soil. In the grassland canopies water vapour flux and sensible
heat flux will be calculated by the energy-balance-Bowen-ratio-method, in the
forest stands by means of the eddy correlation method (see work package
no 6)
Fig. 5/1: Schema of the
measuring system (Click on graphic to view large picture / 49kB)