Results 61 to 70 of about 6,966,556 (215)

Use spectral derivatives for estimating canopy water content [PDF]

, 2010
Hyperspectral remote sensing has demonstrated great potential for accurate retrieval of canopy water content (CWC). This CWC is defined by the product of the leaf equivalent water thickness (EWT) and the leaf area index (LAI).
Clevers, J.G.P.W.
core  

High‐elevation endemic plants predicted to lose habitat from changing climate in Washington State

American Journal of Botany, EarlyView.
Abstract Premise High‐elevation plants face unique challenges from potential climate change impacts that will likely require upslope migration into increasingly smaller suitable habitat. This situation is particularly acute for endemic species that by definition occupy small geographic ranges.
Nicholas L. Gjording, Erik W. Ertsgaard, David E. Giblin, Iris H. Dimpsey, Owen B. Bard   +4 more
wiley   +1 more source

Exposure to heat waves and drought improves subsequent leaf heat tolerance for five oak species in southern California

American Journal of Botany, EarlyView.
Abstract Premise Given the threats of climate change, we investigated the impact of high temperatures separately and in combination with reduced soil water on leaf heat tolerance for five oaks (Fagaceae) with overlapping ranges in southern California, USA: Quercus agrifolia and Q. chrysolepis (evergreen species), Q. douglasii and Q.
Casey D. Wisely, G. Olivia Plumb, Mira N. Ranganath, Emily Dolida, Ishan Ashford, Graham Luethe, Tim Thibault, Gretchen B. North   +7 more
wiley   +1 more source

Water Deficit Alters Canopy Structure but not Photosynthesis during the Regrowth of Alfalfa

, 2009
Growth of alfalfa (Medicago sativa L.) following the correction of a water deficit will depend in part on the characteristics of the canopy grown during the water deficit. The current study was undertaken to determine the extent to which canopy structure
Keith G. Pembleton, Richard P. Rawnsley, Pembleton, Keith, Volenec, Jeffrey J., Rawnsley, Richard P., Daniel J. Donaghy, Donaghy, Daniel J., Jeffrey J. Volenec   +7 more
core   +1 more source

Real‐time monitoring of root dielectric properties for assessing crop plant damage caused by foliar application of glyphosate

Applications in Plant Sciences, EarlyView.
Abstract Premise There is a knowledge gap regarding how foliar injury and restricted water uptake can be detected by measuring root dielectric response. This pot study nondestructively evaluated the efficiency of real‐time dielectric measurement to monitor the effects of glyphosate spraying.
Imre Cseresnyés, Anna Füzy, Tünde Takács   +2 more
wiley   +1 more source

Roles of horizontal and vertical tree canopy structure in mitigating daytime and nighttime urban heat island effects

International Journal of Applied Earth Observations and Geoinformation, 2020
The urban heat island (UHI) is increasingly recognized as a serious, worldwide problem because of urbanization and climate change. Urban vegetation is capable of alleviating UHI and improving urban environment by shading together with evapotranspiration.
Jike Chen, Shuangen Jin, Peijun Du
doaj   +1 more source

Turning a new leaf: PhenoVision provides leaf phenology data at the global scale

Applications in Plant Sciences, EarlyView.
Abstract Premise Plant phenology dictates many aspects of community function and ecosystem dynamics. Yet, global phenology data are still limited, especially in areas lacking monitoring programs. Here we present a new data resource, PhenoVision–Leaf, which extends a computer vision pipeline utilizing iNaturalist digital image vouchers to produce global‐
Erin L. Grady, Ellen G. Denny, Carrie E. Seltzer, John Deck, Daijiang Li, Russell Dinnage, Robert P. Guralnick   +6 more
wiley   +1 more source

Canopy Structural Changes in Black Pine Trees Affected by Pine Processionary Moth Using Drone-Derived Data

Drones
Pine species are a key social and economic component in Mediterranean ecosystems, where insect defoliations can have far-reaching consequences. This study aims to quantify the impact of pine processionary moth (PPM) on canopy structures, examining its ...
Darío Domingo, Cristina Gómez, Francisco Mauro, Hermine Houdas, Gabriel Sangüesa-Barreda, Francisco Rodríguez-Puerta   +5 more
doaj   +1 more source

Tropical forest canopies and their relationships with climate and disturbance: results from a global dataset of consistent field-based measurements

Forest Ecosystems, 2018
Background Canopy structure, defined by leaf area index (LAI), fractional vegetation cover (FCover) and fraction of absorbed photosynthetically active radiation (fAPAR), regulates a wide range of forest functions and ecosystem services.
Marion Pfeifer, Alemu Gonsamo, William Woodgate, Luis Cayuela, Andrew R. Marshall, Alicia Ledo, Timothy C. E. Paine, Rob Marchant, Andrew Burt, Kim Calders, Colin Courtney-Mustaphi, Aida Cuni-Sanchez, Nicolas J. Deere, Dereje Denu, Jose Gonzalez de Tanago, Robin Hayward, Alvaro Lau, Manuel J. Macía, Pieter I. Olivier, Petri Pellikka, Hamidu Seki, Deo Shirima, Rebecca Trevithick, Beatrice Wedeux, Charlotte Wheeler, Pantaleo K. T. Munishi, Thomas Martin, Abdul Mustari, Philip J. Platts   +28 more
doaj   +1 more source

Mapping Lupinus polyphyllus density and distribution along road verges using unmanned aerial vehicle (UAV)–based remote sensing

Applications in Plant Sciences, EarlyView.
Abstract Premise Road verges function as refuges for semi‐natural species, but they can also facilitate the spread of non‐native plants such as Lupinus polyphyllus. Unmanned aerial vehicle (UAV)–based remote sensing is a promising tool for mapping these species; however, its application in roadside contexts remains limited.
Elin L. Blomqvist, Jan‐Olov Andersson, R. Lutz Eckstein, Jan Haas   +3 more
wiley   +1 more source