The changes of stem circumference and transpiration rate of spruce-Iarch forest in relation to changes of environmental characteristics | Zmeny obvodov kmeňov a transpirácie smreka a smrekovca vplyvom meniacich sa podmienok prostredia
2010
Magová, D., Technical University in Zvolen (Slovak Republic). Faculty of Environmental and Manufacturing Technology | Střelcová, K. | Šudý, M., Matej Bel University, Banská Bystrica (Slovak Republic)
Transpiration and sap flow rate of trees and their circumference changes are strongly influenced by climate and weather conditions. The transpiration of spruce (Picea abies (L.) Karst.) and larch (Larix decidua Mill.) sample trees and stem circumference changes were investigated during vegetation period 2009 at research plot Smrekovec, located in the Tatra National Park in Slovakia. The research plot is situated in untouched forest at an altitude 1 249 m asl. Sap flow was measured continually in five sample trees of each of both trees species using the tree-trunk heat balance method (THB). Changes of stem circumference were measured in the same trees using digital dendrometers, DRL 26 (EMS Brno, Cz). Simultaneously the microclimate characteristics were measured: air temperature [°C], air humidity [%], global radiation [kW/h/m2], precipitation [mm], soil temperature [°C] and soil water potential [Pa]. The stem circumference of the sample trees started to create at the end of May after relatively warmer period. The sap flow of sample trees is depending on global radiation, precipitation and soil water potential. We investigate seasonal and diurnal sap flow changes. At the end of May and at the beginning of June it was observed the decrease of tree transpiration due to higher totals of precipitation and low global radiation. Typically, leaf transpiration rate changes substantially during the day. As a result, stem water potential changes constantly. The aim of this paper is to evaluate the influence of the climatic characteristics upon the stem circumference changes and sap flow of the sample spruce and larch trees in the Tatra National Park.
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