Leaf area index of Norway spruce stand in relation to age and defoliation
2012
Pokorny, R., Akademie Ved, Brno (Czech Republic). Centrum Vyzkumu Globalni Zmeny | Stojnic, S., University of Novi Sad (Serbia). Inst. of Lowland Forestry and Environment
This contribution presents LAI data of 17 Norway spruce stands of different age (from 15 to 102 years) and health status (defoliation ranging from 0 to 40 %) located in the Tesinske Beskydy Mts. (NE of the Czech Republic). The defoliation degree was estimated by ocular observation and LAI was estimated indirectly on the base of gap fraction method using LAI-2000 PCA (Li-Cor, USA). It was found that LAI decreased with stand age (approximately from 12.6 to 8.5) whereas defoliation increased. Therefore, a strong relationship between defoliation and LAI as well as gap fractions was found. LAI appears to be a valuable characteristic of the health status of forest stands due to linear relationship (r2 = 0.87) between LAI and defoliation. As LAI can be estimated more objectively by a canopy analyzer then the degree of canopy defoliation by ocular observation, there is a perspective for a wide use of LAI in forest practice. The LAI values can be used for the evaluation of health status of Norway spruce stands.
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