نتایج جستجو برای: leaf canopy temperature

تعداد نتایج: 543727  

2016
Matteo Gatti Paolo Dosso Marco Maurino Maria Clara Merli Fabio Bernizzoni Facundo José Pirez Bonfiglio Platè Gian Carlo Bertuzzi Stefano Poni

Ground-based proximal sensing of vineyard features is gaining interest due to its ability to serve in even quite small plots with the advantage of being conducted concurrently with normal vineyard practices (i.e., spraying, pruning or soil tilling) with no dependence upon weather conditions, external services or law-imposed limitations. The purpose of the present work was to test performance of...

Journal: :Journal of experimental botany 2005
Y Cohen V Alchanatis M Meron Y Saranga J Tsipris

Canopy temperature has long been recognized as an indicator of plant water status and as a potential tool for irrigation scheduling. In the present study, the potential of using thermal images for an in-field estimation of the water status of cotton under a range of irrigation regimes was investigated. Thermal images were taken with a radiometric infrared video camera. Specific leaves that appe...

Journal: :Remote Sensing 2015
Gregory Asner Roberta E. Martin

Non-structural carbohydrates (NSC) are products of photosynthesis, and leaf NSC concentration may be a prognostic indicator of climate-change tolerance in woody plants. However, measurement of leaf NSC is prohibitively labor intensive, especially in tropical forests, where foliage is difficult to access and where NSC concentrations vary enormously by species and across environments. Imaging spe...

2008
M. A Cho J. de Leeuw

Developments in hyperspectral remote sensing have provided new indices or indicators of biochemical and biophysical properties. Most of the studies involving the novel spectral indices have been conducted at the leaf scale and have been rarely investigated for species discrimination. The objectives of the study were to determine hyperspectral indices that (i) are likely to be influenced by chan...

Journal: :Tree physiology 2002
Robert M Hubbard Barbara J Bond Randy S Senock Michael G Ryan

Recent studies have shown that stomata respond to changes in hydraulic conductance of the flow path from soil to leaf. In open-grown tall trees, branches of different heights may have different hydraulic conductances because of differences in path length and growth. We determined if leaf gas exchange, branch sap flux, leaf specific hydraulic conductance, foliar carbon isotope composition (delta...

Journal: :Chemosphere 2016
Chris Geron Ryan Daly Peter Harley Rei Rasmussen Roger Seco Alex Guenther Thomas Karl Lianhong Gu

Leaf-level isoprene and monoterpene emissions were collected and analyzed from five of the most abundant oak (Quercus) species in Central Missouri's Ozarks Region in 2012 during PINOT NOIR (Particle Investigations at a Northern Ozarks Tower - NOx, Oxidants, Isoprene Research). June measurements, prior to the onset of severe drought, showed isoprene emission rates and leaf temperature responses ...

Journal: :Journal of experimental botany 2000
G Deckmyn I Nijs R Ceulemans

There are several very accurate methods to determine leaf angles in closed canopies. However, these are generally very time-consuming or require special equipment. Average canopy leaf angles were derived from simple height and blade length measurements. An exponential relationship between the height/length ratio and the average blade leaf angle was used. The method was tested for two grass spec...

2008
José Enrique Fernández Antonio Diaz-Espejo Roberto Tognetti JOSÉ ENRIQUE FERNÁNDEZ ANTONIO DIAZ-ESPEJO RICCARDO D’ANDRIA LUCA SEBASTIANI ROBERTO TOGNETTI

Data from Spanish and Italian olive orchards with different cultivars (‘‘Manzanilla’’, ‘‘Frantoio’’, ‘‘Leccino’’, ‘‘Razzola’’ and ‘‘Taggiasca’’) growing in different environments (southern Spain; north, centre and south of Italy) were used to illustrate how models on water use and photosynthetic behaviour of the olive tree can be useful tools for choosing pruning intensity and canopy shape for ...

Journal: :The New phytologist 2010
Mashuri Waite Lawren Sack

Mosses are an understudied group of plants that can potentially confirm or expand principles of plant function described for tracheophytes, from which they diverge strongly in structure. We quantified 35 physiological and morphological traits from cell-, leaf- and canopy-level, for 10 ground-, trunk- and branch-dwelling Hawaiian species. We hypothesized that trait values would reflect the disti...

2006
Dong Huang Yuri Knyazikhin Robert E. Dickinson Miina Rautiainen Pauline Stenberg Mathias Disney Philip Lewis Alessandro Cescatti Yuhong Tian Wout Verhoef John V. Martonchik Ranga B. Myneni

The concept of canopy spectral invariants expresses the observation that simple algebraic combinations of leaf and canopy spectral transmittance and reflectance become wavelength independent and determine a small set of canopy structure specific variables. This set includes the canopy interceptance, the recollision and the escape probabilities. These variables specify an accurate relationship b...

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