Index listovej plochy a priestorová distribúcia asimilačného aparátu v poraste buku lesného (Fagus sylvatica L.)

Abstract

One of the most important parameters determining penetration of the photosynthetically active radiation (FAR) through the forest canopy is the leaf area index (LAI). In this thesis we concerned with a comparison of direct and indirect approaches of determining LAI and the vertical distribution of LAI in the canopy. There have been used three optical methods, using the device LiCor LAI 2200 Plant Canopy Analyzer, LaiPen and hemispherical photography. Also, we used the method of estimation LAI using airborne laser scanning. There was created allometric relationship between leaf area and the perimeter of the sample trees. These trees were also destructively processed and based on those, there were created the diagrams of the vertical distribution of leaves in the crowns of these trees. The individual values of the measured leaf area index, were in amplitude from 3.69 m2.m-2 to 11.80 m2.m-2 and the indirect methods underestimated the direct approach in average of 28.46%