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• W2151569684 startingPage "2765" @default.
• W2151569684 abstract "Developing a relationship between the normalized difference vegetation index (NDVI) and the leaf area index (LAI) is essential to describe the pattern of spatial or temporal variation in LAI that controls carbon, water, and energy exchange in many ecosystem process models. Photosynthetic vegetation (PV) properties can affect the estimation of LAI, but no models integrate the effects of multiple species. We developed four alternative NDVI–LAI models, three of which integrate PV effects: no PV effects, leaf-level effects, canopy-level effects, and effects at both levels. The models were fit to data across the natural range of variation in NDVI for a widespread High Arctic ecosystem. The weight of evidence supported the canopy-level model (Akaike weight, wr = 0.98), which includes species-specific canopy coefficients that primarily scale fractional PV cover to LAI by accounting for the area of unexposed PV. Modeling the canopy-level effects improved prediction of LAI (R2 = 0.82) over the model with no PV effect (R2 = 0.71) across the natural range of variation in NDVI but did not affect the site-level estimate of LAI. Satellite-based methods to estimate species composition, a variable in the model, will need to be developed. We expect that including the effects of PV properties in NDVI–LAI models will improve prediction of LAI where species composition varies across space or changes over time." @default.
• W2151569684 created "2016-06-24" @default.
• W2151569684 creator A5085494122 @default.
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• W2151569684 date "2006-11-01" @default.
• W2151569684 modified "2023-10-12" @default.
• W2151569684 title "MODELING THE EFFECT OF PHOTOSYNTHETIC VEGETATION PROPERTIES ON THE NDVI–LAI RELATIONSHIP" @default.
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• W2151569684 doi "https://doi.org/10.1890/0012-9658(2006)87[2765:mteopv]2.0.co;2" @default.
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