Results 231 to 240 of about 171,205 (257)
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Agricultural and Forest Meteorology, 1991
Abstract Hemispherical photographs were taken beneath an 80-years-old Douglas-fir (Pseudotsuga menzie sii) forest stand under clear and overeast sky conditions, and under clear sky with the canopy partially covered with snow. The photographs were digitized using an optical scanner.
J.M. Chen, T.A. Black, R.S. Adams
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Abstract Hemispherical photographs were taken beneath an 80-years-old Douglas-fir (Pseudotsuga menzie sii) forest stand under clear and overeast sky conditions, and under clear sky with the canopy partially covered with snow. The photographs were digitized using an optical scanner.
J.M. Chen, T.A. Black, R.S. Adams
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Estimation of plant area index of grasslands from measurements of canopy radiation profiles
Agricultural and Forest Meteorology, 2001A method is presented by which a simple physical model of radiative transfer may be used to estimate the vertical distribution of the plant area index (PAI) from measurements of average photosynthetically active radiation at various heights within the canopy and a known phytoelement inclination distribution.
Georg Wohlfahrt +3 more
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Global Ecology and Biogeography, 1999
SummaryThe aim of this study is to establish a practical index that considers both the size of the global range, and the mean relative abundance of species within their range. Detailed general distribution maps provide the basis for a classification of ranges into nine size categories.
Matthias H. Hoffmann, Erik Welk
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SummaryThe aim of this study is to establish a practical index that considers both the size of the global range, and the mean relative abundance of species within their range. Detailed general distribution maps provide the basis for a classification of ranges into nine size categories.
Matthias H. Hoffmann, Erik Welk
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Characterising understorey Plant Area Index with TLS
2021Wilkes, Phil +3 more
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Use deconvolution to increase the resolution of the plant area index (PAI) estimates
2021Forests play an essential role in the terrestrial ecosystem. To better measure and understand the changes and structure of vegetation above land, NASA launched Global Ecosystem Dynamics Investigation (GEDI) space-borne lidar to monitor 51.6°S to 51.6°N areas.
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Study on Drought Index in Major Planting Area of Winter Wheat of China
Sensor Letters, 2012Li Sun +4 more
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Efficiency of the leaf disc method for estimating the leaf area index of soybean plants
2013O objetivo deste estudo foi avaliar a eficiência do método dos discos foliares para estimar o índice de área foliar (IAF) de plantas de soja em comparação como método de fotos digitais. O delineamento experimental utilizado foi o de parcelas subdivididas com três repetições.
Pierozan Junior, Clovis +1 more
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