Abstract
The leaf area index (LAI) of three monocultures of Norway spruce (Picea abies (L.) Karst), different in age and structure, was
measured by means of two indirect optical techniques of LAI field mapping: 1/ plant canopy analyser LAI-2000, and 2/ digital
hemispherical photographs (DHP). The supportive measurements with the TRAC instrument were conducted to produce mainly the
element clumping index. The aim of the study was to compare the performances of LAI-2000 and DHP and to evaluate effect of
three different sampling strategies on field estimation of leaf area index. One of the suggested sampling designs introduced spatial
oversampling around one-point measurement. The oversampling was expected to reveal the importance of sampling point position
with respect to surrounding trees. In general, the LAI-2000 instrument produced higher estimates of effective leaf area index than
DHP in all experimental stands. On the other hand, the higher "true" estimates of LAI were obtained from DHP. All three sampling
strategies produced consistent estimates of effective and "true" LAI in all forest sites. The spatial oversampling of LAI measurement
point did not significantly improve the LAI estimate of the canopy subplots.
| Original language | English |
|---|---|
| Title of host publication | Proceedings 10th International Symposium on Physical Measurements and Spectral Signatures in Remote Sensing (ISPMSRS), Davos, Switzerland, 12 - 14 March, 2007 |
| Editors | M.E. Schaepman, S. Liang, N.E. Groot, M. Kneubühler |
| Place of Publication | Davos (CH) |
| Publisher | ISPRS |
| Pages | 499-504 |
| Volume | XXXVI |
| Publication status | Published - 2007 |
| Event | 10th International Symposium on Physical Measurements and Spectral Signatures in Remote Sensing - Duration: 12 Mar 2007 → 14 Mar 2007 |
Conference/symposium
| Conference/symposium | 10th International Symposium on Physical Measurements and Spectral Signatures in Remote Sensing |
|---|---|
| Period | 12/03/07 → 14/03/07 |