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Optimizing the sampling scheme for LAI-2000 measurements in a boreal forest
Agricultural and Forest Meteorology, 2012Abstract Field measurements of leaf area index (LAI) are needed for many ecological and remote sensing applications, but they are laborious and time-consuming. The sampling designs of optical LAI measurements have been mainly driven by the field-of-view of the sensor as well as the upscaling process and spatial resolution of satellite imagery.
Rita Hannu +3 more
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Sampling methodology for LAI measurements with LAI-2000 in small forest stands
Agricultural and Forest Meteorology, 2000Leaf Area Index (LAI) plays a prominent role as an indicator of forest ecosystem condition in research on change detection. For this, rapid and reliable estimation of the effective LAI (LAIe) — this is the ratio of the total one-sided area of vegetation elements over the unit ground area) — at various scales is of utmost importance.
Kris Nackaerts +3 more
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Estimation of leaf area index with the Li-Cor LAI 2000 in deciduous forests
Forest Ecology and Management, 1998Abstract The present study has been performed in Italy, in stands of the main broad-leaved forest species. Thinned and unthinned stands of Quercus cerris L. (6.3% of total area covered by deciduous species in Italy), Castanea sativa L., (8.5%) and Fagus sylvatica L. (12.6%) were selected from 15 permanent plots.
Andrea Cutini +2 more
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Measuring Leaf Area Index with the Li‐Cor LAI‐2000 in Pine Stands
Ecology, 1994Because leaf area index (projected one-sided leaf surface area per unit ground surface area, hereafter referred to as LAI) is a critical variable in models that attempt to simulate carbon, nutrient, water, and energy fluxes for forest ecosystems (e.g., Running and Coughlan 1988), techniques to rapidly estimate LAI over large areas are in great demand ...
Godelieve Deblonde +2 more
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Calibration of LAI-2000 canopy analyser with leaf area index in a young eucalypt stand
Trees, 2005Plant area index (PAI) measured with a LI-COR LAI-2000 plant canopy analyser (PCA) was calibrated with leaf area index (LAI) in a young stand of Eucalyptus grandis in the KwaZulu-Natal Midlands, South Africa. Destructive sampling and allometric equations were used to estimate LAI at 2 and 3 years after planting.
Steven B. Dovey, Ben du Toit
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Agronomy Journal, 2002
The LAI‐2000 Plant Canopy Analyzer provides a rapid estimate of leaf area index (LAI), but its accuracy and utility for estimating soybean [Glycine max (L.) Merr.] defoliation is unknown. This study evaluated minimum plot‐size requirements for manually defoliated soybean experiments using the LAI‐2000; compared LAI estimates using the LAI‐2000 with ...
Sean Malone +2 more
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The LAI‐2000 Plant Canopy Analyzer provides a rapid estimate of leaf area index (LAI), but its accuracy and utility for estimating soybean [Glycine max (L.) Merr.] defoliation is unknown. This study evaluated minimum plot‐size requirements for manually defoliated soybean experiments using the LAI‐2000; compared LAI estimates using the LAI‐2000 with ...
Sean Malone +2 more
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Specular reflection in the signal of LAI-2000 plant canopy analyzer
Agricultural and Forest Meteorology, 2016Abstract In a vegetation canopy part of leaves reflect sky radiation specularly to the LAI-2000 sensor. This fraction is smaller in a planophile canopy and higher in an erectophile canopy. As the specularly reflected radiation does not enter the leaf nor it is absorbed by leaf pigments and depending on the incidence angle on the leaf the reflection ...
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Estimation of foliage clumping from the LAI-2000 Plant Canopy Analyzer: effect of view caps
Trees, 2014Foliage clumping can be estimated from logarithm averaging method in LAI-2000. The spatial scaling of clumping effects considered by the instrument is dependent on the sensor’s azimuthal view. Accurate estimates of foliage clumping index (Ω) are required to improve the retrieval of leaf area index (L) from optical instruments like LAI ...
Francesco Chianucci +4 more
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Correcting LAI-2000 estimates for the clumping of needles in shoots of conifers
Agricultural and Forest Meteorology, 1996The LAI-2000 plant canopy analyzer tends to underestimate the leaf area index (LAI) of coniferous stands because of the clumped (nonrandom) arrangement of needle area in the crown. It has been proposed that, in stands where the individual shoots constitute the most important clumping elements, the LAI-2000 gives an estimate of shoot silhouette area ...
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Effects of clumping on estimates of stand leaf area index using the LI-COR LAI-2000
Canadian Journal of Forest Research, 1993Eighteen natural second-growth stands of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) from a wide range of stand densities and stocking levels were measured for stand leaf area index (LAI) from allometric relationships (direct LAI) and the LI-COR LAI-2000 plant canopy analyzer (indirect LAI).
N. J. Smith, J. M. Chen, T. A. Black
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