Results 261 to 270 of about 1,957,742 (286)
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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 ...
Pauline Stenberg
exaly +2 more sources
Evaluation of LAI-2000 for leaf area index monitoring in paddy rice
Field Crops Research, 2006Leaf area index (LAI) is a variable of primary importance for crop monitoring and it is usually measured by labor intensive destructive field sampling. Indirect non-destructive estimates by optical instruments are a competitive alternative to direct methods for frequent measurements and over large areas.
Daniela Stroppiana +2 more
exaly +3 more sources
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, Giorgio Matteucci
exaly +2 more sources
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.
Bart Muys, Martin Hermy
exaly +2 more sources
Agricultural and Forest Meteorology, 2010
Abstract Leaf area index (LAI) is one of the most frequently used parameters for the analysis of canopy structure and is an important structural characteristic of crop monitoring and crop productivity. The work presented here evaluated the adequacy and the range of reliability of the LAI-2000 Plant Canopy Analyzer estimates for Jatropha ( Jatropha ...
Soumit K Behera +2 more
exaly +2 more sources
Abstract Leaf area index (LAI) is one of the most frequently used parameters for the analysis of canopy structure and is an important structural characteristic of crop monitoring and crop productivity. The work presented here evaluated the adequacy and the range of reliability of the LAI-2000 Plant Canopy Analyzer estimates for Jatropha ( Jatropha ...
Soumit K Behera +2 more
exaly +2 more sources
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 ...
David L Holshouser
exaly +2 more sources
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 ...
David L Holshouser
exaly +2 more sources
Estuarine, Coastal and Shelf Science, 2005
Abstract Using both IKONOS and in situ LAI-2000 sensor data, a map of estimated LAI, based on NDVI, was created for the Agua Brava Lagoon, Mexican Pacific. The LAI values were then aggregated according to four classes; red mangrove (Rhizophora mangle), healthy white mangrove (Laguncularia racemosa), poor condition white mangrove and dead mangrove. Of
John M Kovacs +2 more
exaly +2 more sources
Abstract Using both IKONOS and in situ LAI-2000 sensor data, a map of estimated LAI, based on NDVI, was created for the Agua Brava Lagoon, Mexican Pacific. The LAI values were then aggregated according to four classes; red mangrove (Rhizophora mangle), healthy white mangrove (Laguncularia racemosa), poor condition white mangrove and dead mangrove. Of
John M Kovacs +2 more
exaly +2 more sources
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source