نتایج جستجو برای: vegetation canopy

تعداد نتایج: 59140  

2017
S. Frolking Tom Milliman K. C. McDonald John S. Kimball Maosheng Zhao Mark Fahnestock Steve FroM

Phenology, or the seasonality of recurring biological events such as vegetation canopy http://www.agu.org/pubs/crossref/2006/2005JD006588.shtml (1 of 2)9/1/2006 9:19:03 AM Evaluation of the SeaWinds scatterometer for regional monitoring of vegetation phenology development and senescence, is a primary constraint on global carbon, water and energy cycles. We analyzed multiseason Ku-band radar bac...

2012
C. Guilherme Becker David Rodriguez Ana V. Longo Amanda L. Talaba Kelly R. Zamudio

Habitat loss and chytridiomycosis (a disease caused by the chytrid fungus Batrachochytrium dendrobatidis - Bd) are major drivers of amphibian declines worldwide. Habitat loss regulates host-pathogen interactions by altering biotic and abiotic factors directly linked to both host and pathogen fitness. Therefore, studies investigating the links between natural vegetation and chytridiomycosis requ...

2014
Xi Yang Jianwu Tang John F. Mustard

Plant phenology, a sensitive indicator of climate change, influences vegetation-atmosphere interactions by changing the carbon and water cycles from local to global scales. Camera-based phenological observations of the color changes of the vegetation canopy throughout the growing season have becomepopular in recent years. However, the linkages between camera phenological metrics and leaf bioche...

Fire affects vegetation and changes plant succession. In this paper, the vegetation of Sirachal Research Station, which burned in the summer of 2014, was studied and compared with the unburnt areas, based on biodiversity indices. The research was implemented as a factorial experiment in a completely randomized design. First, on the basis of physiognomy, the area was divided into three parts: sh...

2015
Ute Petersen Johannes Isselstein

In biodiversity experiments based on seeded experimental communities, species richness and species composition exert a strong influence on canopy structure and can lead to an improved use of aboveground resources. In this study, we want to explore whether these findings are applicable to agriculturally managed permanent grassland. Vertical layered profiles of biomass, leaf area (LA) and light i...

2005
JONATHAN K. WEBB RICHARD SHINE ROBERT M. PRINGLE

In the last two centuries, European fire suppression practices have produced increases in vegetation density and canopy cover in many landscapes. Potentially, increases in canopy cover could negatively affect small populations of nocturnal reptiles that use sun-exposed shelters for diurnal thermoregulation. We hypothesized that vegetation encroachment over rock outcrops might partly explain the...

2009
Maxim Neumann Laurent Ferro-Famil Andreas Reigber

This paper concerns vegetation parameter retrieval from polarimetric interferometric SAR (PolInSAR) data. A two–component polarimetric interferometric model, designed for geophysical parameter retrieval, is presented for volumetric media over ground. It is based on a scattering model based polarimetric decomposition and the random volume over ground (RVoG) PolInSAR inversion technique. For fore...

Journal: :Int. J. Applied Earth Observation and Geoinformation 2011
Mariano García F. Mark Danson David Riaño Emilio Chuvieco F. Alberto Ramirez Vishal Bandugula

This paper evaluates the potential of a terrestrial laser scanner (TLS) to characterize forest canopy fuel characteristics at plot level. Several canopy properties, namely canopy height, canopy cover, canopy base height and fuel strata gapwere estimated. Different approaches were tested to avoid the effect of canopy shadowing on canopy height estimation caused by deployment of the TLS below the...

2008
M. Ghisalberti Marco Ghisalberti Heidi Nepf

Aquatic flow over a submerged vegetation canopy is a ubiquitous example of flow adjacent to a permeable medium. Aquatic canopy flows, however, have two important distinguishing features. Firstly, submerged vegetation typically grows in shallow regions. Consequently, the roughness sublayer, the region where the drag length scale of the canopy is dynamically important, can often encompass the ent...

2006
Yen-Ben Cheng Pablo J. Zarco-Tejada David Riaño Carlos A. Rueda Susan L. Ustin

Three linked leaf and canopy radiative transfer models were used to assess uncertainties in three vegetation architectures for the relationships between canopy water content and Equivalent Water Thickness (EWT). The leaf radiative transfer model PROSPECT was linked to SAILH, rowMCRM, and FLIM canopy reflectance models to generate synthetic spectra for a range of leaf and canopy parameters under...

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