Jan Čermák, Mendel University in Brno, Czech Republic

Jan Čermák, Mendel University in Brno, Czech RepublicOur group at the Institute of Forest Botany, Dendrology and Geobiocenology is focused on the whole-tree and stands eco-physiology, mostly water relations and structure in forests and orchards. (Earlier we also worked on natural volatiles in order to estimate provenances, phenological phases and drought stress). We elaborated methods for measurements of sap flow, which was found very suitable for water relations, but also due to its great integrating abilities and relations to tree structure. Leaf distribution we studied in a series of broadleaf and coniferous species. On the basis of rather easily measurable functions we are also estimating the efficient size and form of tree crowns. We characterized stems by sapwood depths, radial patterns of flow density and vessel distribution (which was done also for petioles) in terms of effectivity of conductive systems. Also root distribution was analyzed by gentle excavation method - supersonic air stream; but we mostly applied non-invasive methods as ground penetrating radar, modified earth impedance and sap flow radial patterns. These provide quantitative results and also show dynamics of root activity. The aim of most studies usually done using specialized field instrumentation was to get information important for physiology, but also suitable for practical purposes.


Title of talk to be presented

Improvement of sap flow methodology and its application in a non-traditional way including relations to tree structure.



Cermák J., Nadezhdina N. 2009. Application of sap flow technique for characterizing the whole tree architecture, especially root distribution. 7th Internatioal Workshop on Sap Flow, Seville (Spain) 21-24 October 2008. Acta Horticulturae (ISHS) 846: 219-228.

Cermák J. and Prax A. 2009. Transpiration and soil water supply in floodplain forests. Ekologia, 28(3): 248-254.

Gartner K., Leitgeb E., Nadezhdina N., Englisch M. and Cermák J. 2009. Sap flow of birch and Norway spruce during the European hot and dry summer 2003. Forest Ecology and Management. 258: 590-599.

Čermák J. 2008. Tree eco-physiology: investigations into tree water relations, structure and growth. In: Trees, Roots, Fungi, Soil. Below-ground ecosystem & implications for tree health. 32-42pp. Cardiff National Museum, Cathays Park, Cardiff.

Cermák J., Nadezhdina N., Meiresonne L., & Ceulemans R. 2008. Scots pine root distribution derived from radial sap flow patterns in stems of large leaning trees. Plant and Soil 305 (1-2): 61-75.