c2.6.10 – Assessing seasonal transpiration patterns in deciduous oak forests

Cermak J (1), Nadezhdina N (1), Raschi A (2), Tognetti R (2), Longobucco A (2)

(1) Institute of Forest Ecology, Mendel’s University of Agriculture and Forestry, Brno, Czech Rep; (2) C.N.R. – I.A.T.A., Firenze, Italy
Collocazione: c2.6.10 – Tipo Comunicazione: Poster
2° Congresso SISEF *
Sessione 6: “Posters” *

Abstract: The reported work is part of a wider research activity aiming to compare the remote sensed data about forest canopy structure and transpiration with ground truth and to assess the use of remote sensing and GIS techniques in scaling up and spatialization. Two experimental forest sites for transpiration estimates were selected in central Tuscany, being characterized by the presence of Q. pubescens and Q. cerris, respectively, as dominant species. Biometric data measured in all the trees in the two plots included basal area, stem diameter at breast height, projected crown radius and area, tree social radius and area. Twelve trees per each plot were selected, as being representative for the entire stands, based on their size; the technique of qualtils of the total was applied to select the sample trees. Transpiration was evaluated by sap flow rate measurements; in large trees the method of stem heat balance with internal heating of tissues was used, while in smaller trees the heat field deformation method with linear radial heating was applied. The measurements were carried out throughout the vegetative season in the years 1997-1999; data were measured every minute and stored as means of 15 min. intervals. In each trunk two measuring points were installed from opposite sides; radial patterns of sap flow were also measured in selected periods. The preliminary results are discussed, and the perspectives for further research are outlined.

Citazione: Cermak J , Nadezhdina N , Raschi A , Tognetti R , Longobucco A (1999). Assessing seasonal transpiration patterns in deciduous oak forests . 2° Congresso Nazionale SISEF, Bologna, 20 – 22 Ott 1999, Contributo no. #c2.6.10