نتایج جستجو برای: land fragmentation

تعداد نتایج: 151571  

Journal: :ISPRS Int. J. Geo-Information 2017
Yiqun Xie Bryan C. Runck Shashi Shekhar Len Kne David Mulla Nicolas Jordan Peter Wiringa

Demand for agricultural food production is projected to increase dramatically in the coming decades, putting at risk our clean water supply and prospects for sustainable development. Fragmentation-free land allocation (FF-LA) aims to improve returns on ecosystem services by determining both space partitioning of a study area and choice of land-use/land-cover management practice (LMP) for each p...

Journal: :Biology letters 2008
Nicolas Vidal Anna Azvolinsky Corinne Cruaud S Blair Hedges

Populations of terrestrial or freshwater taxa that are separated by oceans can be explained by either oceanic dispersal or fragmentation of a previously contiguous land mass. Amphisbaenians, the worm lizards (approx. 165 species), are small squamate reptiles that are uniquely adapted to a burrowing lifestyle and inhabit Africa, South America, Caribbean Islands, North America, Europe and the Mid...

Journal: :IJAGR 2015
Daniel Unger I-Kuai Hung Kenneth W. Farrish Darinda Dans

The Haynesville Shale lies under areas of Louisiana and Texas and is one of the largest gas plays in the U.S. Encompassing approximately 2.9 million ha, this area has been subject to intensive exploration for oil and gas, while over 90% of it has traditionally been used for forestry and agriculture. In order to detect the landscape change in the past few decades, Landsat Thematic Mapper (TM) im...

2015
Adrian Mark Tompkins Luca Caporaso Riccardo Biondi Jean Pierre Bell Gil Bohrer

A new deforestation and land-use change scenario generator model (FOREST-SAGE) is presented that is designed to interface directly with dynamic vegetation models used in latest generation earth system models. The model requires a regional-scale scenario for aggregate land-use change that may be time-dependent, provided by observational studies or by regional land-use change/economic models for ...

Journal: :ecopersia 2013
hamid reza kamyab abdolrassoul salman mahiny

logistic regression (lr) was used to model urban growth between the years 1987 and 2001 in gorgan city, north east of iran. three groups of variables including economic-social, land use and biophysical variables were used in the modeling practice. using covariance of the independent variables, distance to administrative and sporting centers plus distance to cities were removed. roc (relative op...

1998
Kenneth M. Chomitz David A. Gray

Rural roads promote economic development, but they also facilitate deforestation. To explore this tradeoff, this article develops a spatially explicit model of land use and estimates probabilities of alternative land uses as a function of land characteristics and distance to market using a multinomial logit specification of this model. Controls are incorporated for the endogeneity of road place...

Journal: :تحقیقات اقتصاد و توسعه کشاورزی ایران 0
غلامحسین عبدالله زاده دانشگاه علوم کشاورزی و منابع طبیعی گرگان، استادیار خلیل کلانتری پردیس کشاورزی و منابع طبیعی دانشگاه تهران، دانشکده اقتصاد و توسعه کشاورزی، استاد علیرضا صحت دانشگاه آزاد واحد علوم تحقیقات، کارشناس ارشد ترویج و اموزش منابع طبیعی علیرضا خواجه شاهکویی دانشگاه گلستان، استادیار

the purpose of the current research was to assess and analyze the effects of land renovation and development schemes. the work was carried out as case study in khor o biabanak area of esfahan province. the research was based upon survey, utilizing questionnaire and interview as tools to gather data. the statistical population contained all the land holdings related to the projects who had recei...

2012
Ting Liu Xiaojun Yang

Over the past years, the agent-based modeling approach has emerged as a promising geospatial technique for urban change simulation. In this paper, we review the status of agent-based models for urban land change research, with the emphasis on the issues of how far agent-based models have been implemented to model the real world complexity. For such a purpose, we have identified four features of...

2011
Victor Tamba Jiangfeng Li

This study investigated land use changes, and their ecological effects in Wuhan (1987-2005). Remote Sensing techniques extracted land use data, whilst the spatial analyst software, Fragstats quantified ecological metrics at both landscape and class levels. The results showed increased urban and agricultural land uses (1987-2005); with urban land increasing more than 250 percent. This was largel...

Journal: :international journal of agricultural science, research and technology in extension and education systems 0
onwuchekwa raphael iheke department of agricultural economics, michael okpara university of agriculture, umudike pmb 7267, umuahia, abia state, nigeria ukandu ihuoma department of agricultural economics, michael okpara university of agriculture, umudike pmb 7267, umuahia, abia state, nigeria

this study examined the effect of urbanization on agricultural production in abia state. specifically, it categorized the land tenancy status of the farmers, analyzed the effect of urbanization on agricultural productivity and identified the constraints to agricultural productivity. multistage random sampling technique was used to select the respondents. primary data collected using structured ...

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