M. Prskawetz et Mj. Lexer, Application of the LI-COR LAI-2000 for measuring leaf area index in young beech stands, ALLG FORST, 171(9-10), 2000, pp. 185-191
Leaf area index from 12 pure beech stands was estimated with LI-COR's LAI-2
000 (LAI,,) and compared with LAI calculated from locally parameterized all
ometric diameter-leaf-area-relationships. Measurements with the LAI-2000 we
re made twice, in summer and leafless in winter. We observed a strong corre
lation and a bias between LAI-2000 estimates and LAI calculated from tree a
llometrics. LAI-2000 estimates were always lower (32% on average). Underest
imation could not be explained by stand attributes such as stand basal area
and mean stand height and diameter. The multiplicative combination of LAI-
2000 estimates and stand attributes explained more of the variance in direc
tly calculated LAI than LAI-2000 estimates alone. Employing LAI,, determine
d as the difference of LAI-2000 estimates in summer and winter respectively
yielded just slightly better results.