نتایج جستجو برای: in protected area

تعداد نتایج: 17020089  

2017
Marine Deguignet Andy Arnell Diego Juffe-Bignoli Yichuan Shi Heather Bingham Brian MacSharry Naomi Kingston

Over the past decades, a number of national policies and international conventions have been implemented to promote the expansion of the world's protected area network, leading to a diversification of protected area strategies, types and designations. As a result, many areas are protected by more than one convention, legal instrument, or other effective means which may result in a lack of clari...

2014
Paolo Russu Baodong Zheng

This paper investigates how the introduction of user fees and defensive expenditures changes the complex dynamics of a discrete-time model, which represents the interaction between visitors and environmental quality in an open-access protected-area OAPA . To investigate this issue more deeply, we begin by studying in great detail the OAPA model, and then we introduce the user fee β and the defe...

2007
E. S. Dias A. J. Edwardes R. S. Purves

The advent of location-based technologies deployed in protected areas provides both visitors and managers of such areas with new opportunities. In this paper we investigate the potential for mining individual tracks of visitors’ geospatial lifelines to both extract information describing aggregated patterns of group behaviour and characterise individual actions. Methods to spatio-temporally clu...

2015
Wei Liu Christine A. Vogt Frank Lupi Guangming He Zhiyun Ouyang Jianguo Liu

Evolution of tourism in a flagship protected area of China Wei Liu, Christine A. Vogt, Frank Lupi, Guangming He, Zhiyun Ouyang & Jianguo Liu To cite this article: Wei Liu, Christine A. Vogt, Frank Lupi, Guangming He, Zhiyun Ouyang & Jianguo Liu (2015): Evolution of tourism in a flagship protected area of China, Journal of Sustainable Tourism, DOI: 10.1080/09669582.2015.1071380 To link to this a...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2014
Arun Agrawal

Excitement among social scientists about the discovery of randomized controlled trials has been tempered by the recognition that experimental research and related designs may be infeasible, prohibitively expensive, or even unsuitable for an enormous range of questions of interest to social science and policy (1–3). Recourse to matching-based statistical approaches can enable more transparent ca...

2014
Alfredo C. Pereira Júnior Sofia L. J. Oliveira José M. C. Pereira Maria Antónia Amaral Turkman

Covering almost a quarter of Brazil, the Cerrado is the world's most biologically rich tropical savanna. Fire is an integral part of the Cerrado but current land use and agricultural practices have been changing fire regimes, with undesirable consequences for the preservation of biodiversity. In this study, fire frequency and fire return intervals were modelled over a 12-year time series (1997-...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند - دانشکده کشاورزی 1390

abstract this study is carried out to determine the chemical composition in the three vegetative stages of the haloxylon sp., degradation parameters, with adding naoh and ca(oh2 ). for this purpose, in may and october and january 2010 enough some haloxylon sp. of the ammary area was prepared. crude protein and ash percentage are decrease, neutral detergent fiber percentage with pragress stage ...

Haftad-Gholleh Area has recently encountered many changes. In this study, by using landsat images of the years 1996 and 2016, landuse maps were classified into four classes including: agriculture, rangeland, residential areas, and rocks. Land Change Modeler (LCM) and Habitat and Biodiversity Modeler (HBM) modules in the Idrisi GIS software were used to analyze the land use changes and habitat e...

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