نتایج جستجو برای: vegetation density

تعداد نتایج: 453936  

2014
Cole D. Fitzpatrick

Roadside vegetation provides numerous environmental and psychological benefits to drivers. Previous studies have shown that natural landscapes can effectively lower crash rates and cause less stress and frustration to the driver. However, runoff the road crashes resulting in a collision with a tree are twice as likely to result in a fatality, thus reinforcing the need to examine the placement o...

Journal: :Ecological Informatics 2008
P. Michel J. Jenkins N. Mason K. J. M. Dickinson I. G. Jamieson

In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: In the study of habitat use by animals, it is important to sample vegetation structure or the degree of cover at different h...

2004
F. I. WOODWARD

The Sheffield Dynamic Global Vegetation Model has simulated the structure and net carbon exchange of vegetation at five sites along the Kalahari transect where there is a strong gradient in precipitation from 299 to 918mmyr . There has been a decline in precipitation of 8mmyr 1 along the whole of the transect since about 1970. Simulations of vegetation dynamics and structure indicate that this ...

1999
Ioannis Dimopoulos J. Chronopoulos Sovan Lek

The aim of the present work is to propose a model for the estimation of lead concentration in grasses using urban descriptors easily accessible and to study the specific effect of each descriptor on lead concentration. Six descriptors were considered: the density of vegetation, the vegetation height, wind velocity, height of building, distance of adjacent street, traffic volume. Lead concentrat...

Journal: :Revista de salud publica 2014
Angye Meza-Ballesta Leonardo Gónima

OBJECTIVE Analyzing the spatio-temporal relationship regarding the occurrence of cases of dengue in Colombia's Córdoba Department and the temperature, rainfall and the phenological state of vegetation (vigor and density). METHODS A statistical and cartographical study of spatio-temporal distribution regarding the occurrence of cases of dengue was studied in 30 selected municipalities. Simple ...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2006
J J Soares M H A O Souza M I S Lima

Secondary succession in degraded areas is little studied, especially where long-term observation of evolutionary processes is concerned. The aim of this work was to follow the qualitative and quantitative changes in vegetation throughout the regeneration process after fire in a cerrado with forest physionomy. The area under study is a reserve on CPPSE-EMBRAPA's farm, São Carlos region of São Pa...

Journal: :International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases 2016
Gladys Mosomtai Magnus Evander Per Sandström Clas Ahlm Rosemary Sang Osama Ahmed Hassan Hippolyte Affognon Tobias Landmann

OBJECTIVE Rift Valley fever (RVF) is a mosquito-borne infection with great impact on animal and human health. The objectives of this study were to identify ecological factors that explain the risk of RVF outbreaks in eastern and central Kenya and to produce a spatially explicit risk map. METHODS The sensitivity of seven selected ecological variables to RVF occurrence was assessed by generaliz...

Journal: :Remote Sensing 2015
Xiaoyi Guo Hongyan Zhang Tao Yuan Jianjun Zhao Zhenshan Xue

Vegetation is an important part of terrestrial ecosystems. Although vegetation dynamics have explicit spatial and temporal dimensions, the study of the temporal process is in its infancy. Evaluation of temporal scaling behavior could provide a unique perspective for exploring the temporal nature of vegetation dynamics. In this study, the Global Inventory Modeling and Mapping Studies (GIMMS) Nor...

Journal: :محیط زیست طبیعی 0
سعیده ملکی نجف آبادی مربی دانشکده منابع طبیعی، دانشگاه زابل، ایران محمودرضا همامی استادیار دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان، ایران وحید راهداری مربی پژوهشکده تالاب بین المللی هامون، دانشگاه زابل، ایران

ovis orientalis isphahanica has a restricted geographical range and is listed as vulnerable by iucn. however, there is not enough data on habitat associations of this taxon to be used as a base for conservation programmes. use of vegetation communities by isfahan mouflon in mouteh wildlife refuge was studied over a one-year period. habitat use was related to vegetation communities and habitat v...

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