Check out the latest publication with UGT lysimeters:
Evaluation of eddy covariance latent heat fluxes with independent lysimeter and sapflow estimates in a Mediterranean savannah ecosystem
Oscar Perez-Priego (a),∗, Tarek S. El-Madany (a), Mirco Migliavacca (a), Andrew S. Kowalski (b),
Martin Jung (a), Arnaud Carrara (c), Olaf Kolle (a), M. Pilar Martín (d), Javier Pacheco-Labrador (d), Gerardo Moreno (e), Markus Reichstein (a)
a Max Planck Institute for Biogeochemistry, Jena, Germany
b Departamento de Física Aplicada, Universidad de Granada, Granada, Spain
c Fundación Centro de Estudios Ambientales del Mediterráneo (CEAM), Valencia, Spain
d Environmental Remote Sensing and Spectroscopy Laboratory (SpecLab), Institute of Economics, Geography and Demography (IEGD-CCHS), Spanish
National Research Council (CSIC), Spain
e Forest Research Group, Universidad de Extremadura, Plasencia, Spain

http://www.sciencedirect.com/science/article/pii/S0168192317300096