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Registros recuperados: 3
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Calibration and validation of hyperspectral indices for the estimation of broadleaved forest leaf chlorophyll content, leaf mass per area, leaf area index and leaf canopy biomass Inra
Le Maire, G.; François, C.; Soudani, K.; Berveiller, D.; Pontailler, J.Y.; Breda, N.; Genet, H.; Davi, H.; Dufrêne, E..
This article aims at finding efficient hyperspectral indices for the estimation of forest sun leaf chlorophyll content (CHL, µg cmleaf− 2), sun leaf mass per area (LMA, gdry matter mleaf− 2), canopy leaf area index (LAI, m2leaf msoil− 2) and leaf canopy biomass (Bleaf, gdry matter msoil− 2). These parameters are useful inputs for forest ecosystem simulations at landscape scale. The method is based on the determination of the best vegetation indices (index form and wavelengths) using the radiative transfer model PROSAIL (formed by the newly-calibrated leaf reflectance model PROSPECT coupled with the multi-layer version of the canopy radiative transfer model SAIL). The results are tested on experimental measurements at both leaf and canopy scales. At the...
Tipo: Journal Article Palavras-chave: MICROONDE; TENEUR EN CHLOROPHYLLE; MODELISATION CHLOROPHYLL; LMA; SLA; LEAF BIOMASS; EO1 HYPERION; ASD FIELDSPEC; LAI; PROSPECT; SAIL; PROSAIL.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20093213d823&uri=/notices/prodinra1/2009/01/
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Complex bioclimatic and soil gradients shape leaf trait variation in Embothrium coccineum (Proteaceae) among austral forests in Patagonia RChHN
SOUTO,CINTIA P; PREMOLI,ANDREA C; REICH,PETER B.
Patterns of trait variation may be adaptive when vary in relation to an environmental gradient. In particular, leaf traits can affect productivity and competitive ability. We identify patterns of leaf size and shape variation with environmental heterogeneity in one of the most widespread tree species within temperate South America: Embothrium coccineum (Proteaceae). We collected leaf specimens and composite soil samples from 35 populations between 38° and 55° S latitude in Patagonia, covering a wide range of mean annual precipitation (MAP) and mean annual temperature (MAT). At each location, we measured nine morphological traits, some of which were cross correlated hence we focus on a smaller number of representative traits. We hypothesized that leaf area...
Tipo: Journal article Palavras-chave: Leaf shape; Complex gradients; Leaf area; Dry mass; SLA.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000200004
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TO 'B' OR NOT TO 'B': AN ANALYSIS OF ALBERTA UNDER THE SOFTWOOD LUMBER AGREEMENT AgEcon
Ryan, Chris; Mach, Helmut.
On October 16th 2006 the Canada-United States Softwood Lumber Agreement (SLA) came into effect. The SLA followed years of trade disputes and litigation initiated by U.S. lumber producers. The SLA ended litigation and dispute procedures by implementing an agreed Canadian export restriction and export tax regime. However, even with a formal agreement in place, points of contention remain on either side. The intent of this study is to evaluate Alberta’s performance under the SLA since its inception in 2006 and the implications for the future. To that end, there are several important characteristics of the SLA that are important to define. The SLA uses a system of export taxes and volume targets to attempt to restrict the total volume of softwood lumber...
Tipo: Report Palavras-chave: Alberta; FTA; NAFTA; Forestry; Commodities trade; International trade; Lumber; Softwood lumber; Trade disputes; United States; Softwood lumber agreement; SLA; Demand and Price Analysis; International Relations/Trade; Political Economy; Public Economics; Resource /Energy Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/60428
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