Spatial and temporal variability of leaf area index in relatively homogenous stands

0561484 - ÚH 2023 CZ eng A - Abstrakt
Toušková, Jitka - Šípek, Václav
Spatial and temporal variability of leaf area index in relatively homogenous stands.
Sborník z konference Hydrologie, GIS a životní prostředí 2022. Praha: ČVUT, fakulta stavební, Katedra hydromeliorací a krajinného inženýrství, 2022 - (Tejkl, A.; Báčová, M.; Kavka, P.). s. 5-6. ISBN 978-80-01-07030-7.
[Hydrologie, GIS a životní prostředí 2022. 06.06.2022-07.06.2022, Nové Hamry]
Institucionální podpora: RVO:67985874
Klíčová slova: leaf area index * canopy structure * beech * spruce
Obor OECD: Hydrology

Leaf area index (LAI) is a dimensionless variable that can be defined as the total one-sided tree leaf area per unit ground surface. It’s a key parameter for canopy structure analysis. The objectives of the work presented here is to evaluate spatial and temporal variability of LAI measured by the LAI-2000 Plant Canopy Analyzer (LAI-2000 PCA) and its possible correlation with variations in e.g. soil moisture. Data were collected monthly during growing season in 3 distinctive forest stands: a) homogenous Norway spruce (Picea abies L. Karst) forest, b) homogenous European beech (Fagus sylvatica L.) forest and c) mixed forest of these two tree species. In every site 1 experimental plot of 50 x 50 m (in spruce and mixed forests) and 25 x 50 m (in case of beech forest) was stablished and measurement of by LAI-2000 PCA was made in 5m grid, in summary in 121 (spruce and mixed forest) or in 66 (in beech forest) points. Preliminary results showed significant differences between overall LAI of analyzed plots. For spruce forest it was 3.17 and 4.35 in April and September, respectively. In the mixed forest LAI decreased from 3.28 in the end of growing season to 0.89 to its beginning. Maps generalized from ArcGis 10.6 software demonstrated the spatial heterogeneity of LAI values in field. Coefficients of variation also proved that values of Norway spruce stand are more scattered than in mixed forest.
Trvalý link: https://hdl.handle.net/11104/0334082