نتایج جستجو برای: vertical vegetation structure

تعداد نتایج: 1685994  

Journal: :Saudi journal of biological sciences 2012
Abdulrahman Alatar Mohamed A El-Sheikh Jacob Thomas

THIS ARTICLE HAS BEEN RETRACTED please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief and Author. Data processing errors have resulted in misleading conclusions. The scientific community in King Saud University has serious concerns regarding the results and the article will be res...

Journal: :Computers & Geosciences 2017
Alexis Beudin Tarandeep S. Kalra Neil K. Ganju John C. Warner

Emergent and submerged vegetation can significantly affect coastal hydrodynamics. However, most deterministic numerical models do not take into account their influence on currents, waves, and turbulence. In this paper, we describe the implementation of a wave-flow-vegetation module into a Coupled-Ocean-AtmosphereWave-Sediment Transport (COAWST) modeling system that includes a flow model (ROMS) ...

2008
X. M. Jin Y.-K. Zhang

The spatial distribution of vegetation in the Qilian Mountain area was quantified with remote sensing data. The MODIS NDVI values for June, July, August and September are the best indicators for the vegetation growth during a year in this area and thus were used in this study. The results obtained by analyzing the NDVI data for seven years from 2000 to 2006 clearly indicated that elevation is t...

2016
Nick A. Cutler Olivia M. Shears Richard T. Streeter Andrew J. Dugmore

The factors that influence tephra layer taphonomy are poorly understood, but vegetation cover is likely to play a role in the preservation of terrestrial tephra deposits. The impact of vegetation on tephra layer preservation is important because: 1) the morphology of tephra layers could record key characteristics of past land surfaces and 2) vegetation-driven variability in tephra thickness cou...

Journal: :Landscape and Urban Planning 2021

Management of restored areas requires ecologically meaningful spatial data providing objective measures restoration success. Understanding relationships between species diversity on the one hand and habitat heterogeneity productivity other can help establish such prioritize management. We used airborne LiDAR hyperspectral to derive characteristics vegetation structure, primary senescent (i.e. o...

2017
Safa Bousbih Mehrez Zribi Zohra Lili-Chabaane Nicolas Baghdadi Mohammad El-Hajj Qi Gao Bernard Mougenot

The main objective of this study is to analyze the potential use of Sentinel-1 (S1) radar data for the estimation of soil characteristics (roughness and water content) and cereal vegetation parameters (leaf area index (LAI), and vegetation height (H)) in agricultural areas. Simultaneously to several radar acquisitions made between 2015 and 2017, using S1 sensors over the Kairouan Plain (Tunisia...

2015
Ignacio del-Moral-Martínez Jaume Arnó Alexandre Escolà Ricardo Sanz-Cortiella Joan Masip-Vilalta Joaquim Company-Messa Joan Ramón Rosell Polo

This paper presents the use of a terrestrial light detection and ranging (LiDAR) system to scan the vegetation of tree crops to estimate the so-called pixelated leaf wall area (PLWA). Scanning rows laterally and considering only the half-canopy vegetation to the line of the trunks, PLWA refers to the vertical projected area without gaps detected by LiDAR. As defined, PLWA may be different depen...

2004
Andrew J. Guswa Michael A. Celia Ignacio Rodriguez-Iturbe

Water-limited ecosystems are characterized by precipitation with low annual totals and significant temporal variability, transpiration that is limited by soil-moisture availability, and infiltration events that may only partially rewet the vegetation root zone. Average transpiration in such environments is controlled by precipitation, and accurate predictions of vegetation health require adequa...

2017
Juan E. Panebianco Mariano J. Mendez Daniel E. Buschiazzo Donaldo Bran Juan J. Gaitán

Wind erosion of freshly-deposited volcanic ash causes persistent storms, strongly affecting ecosystems and human activity. Wind erosion of the volcanic ash was measured up to 17 months after the ash deposition, at 7 sites located within the ash-deposition area. The mass flux was measured up to 1.5 m above ground level. Mass transport rates were over 125 times the soil wind-erosion rates observe...

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