نتایج جستجو برای: desertification

تعداد نتایج: 1803  

Journal: :Remote Sensing 2015
Lijuan Miao Peilong Ye Bin He Lizi Chen Xuefeng Cui

Dry Land Asia is the largest arid and semi-arid region in the northern hemisphere that suffers from land desertification. Over the period 1982–2011, there were both overall improvement and regional degeneration in the vegetation NDVI. We analyze future climate changes in these area using two ensemble-average methods from CMIP5 data. Bayesian Model Averaging shows a better capability to represen...

2013
Ning Liu Lihua Zhou J. Scott Hauger

This paper undertakes a direct, comprehensive assessment of the long-term sustainability of desertification rehabilitation in China under a plausible but worst case scenario where governmental interventions, in the form of payments for environmental services (PES), will cease. The analysis is based on household behavior as well as experimental data. Our econometric results highlight the main ob...

2016
Ya Wang Lihua Zhou

Sandy desertification is one of the most severe ecological problems in the world. Essentially, it is land degradation caused by discordance in the Social-Ecological Systems (SES). The ability to coordinate SES is a principal characteristic of regional sustainable development and a key factor in desertification control. This paper directly and comprehensively evaluates the ability to coordinate ...

Desertification phenomenon is not devoted to an especial climate, although its role in arid and semi-arid areas is clearer than other regions. In this research, four criterions of the wind erosion, soil, vegetation cover and climate have been considered for evaluating desertification potential and mapping of desertification intensity using to IMDPA model in ZAHAK Sistan region. Considering to e...

Journal: :Environmental management 2014
C Kosmas Or Kairis Ch Karavitis C Ritsema L Salvati S Acikalin M Alcala P Alfama J Atlhopheng J Barrera A Belgacem A Solé-Benet J Brito M Chaker R Chanda C Coelho M Darkoh I Diamantis O Ermolaeva V Fassouli W Fei J Feng F Fernandez A Ferreira C Gokceoglu D Gonzalez H Gungor R Hessel J Juying H Khatteli N Khitrov A Kounalaki A Laouina P Lollino M Lopes L Magole L Medina M Mendoza P Morais K Mulale F Ocakoglu M Ouessar C Ovalle C Perez J Perkins F Pliakas M Polemio A Pozo C Prat Y Qinke A Ramos J Ramos J Riquelme V Romanenkov L Rui F Santaloia R Sebego M Sghaier N Silva M Sizemskaya J Soares H Sonmez H Taamallah L Tezcan D Torri F Ungaro S Valente J de Vente E Zagal A Zeiliguer W Zhonging A Ziogas

An approach to derive relationships for defining land degradation and desertification risk and developing appropriate tools for assessing the effectiveness of the various land management practices using indicators is presented in the present paper. In order to investigate which indicators are most effective in assessing the level of desertification risk, a total of 70 candidate indicators was s...

Akbari, Mehri, Fakhrabadi, Amir, Nasserzadeh, Mohammed Hossai, Salighe, Mohamad ,

Aims & Backgrounds: Desertification is one of the major challenges in today's world, especially in countries like Iran that are affected by arid and semi-arid climates. To prevent and slow down the desertification process and in other words, with the aim of preventing and reducing desertification speed, the first effective and necessary step is to identify the susceptible areas and the factors ...

ژورنال: علوم آب و خاک 2015
جعفری, رضا, سلطانی, سعید, فتحی, محبوبه,

Desertification is known as a major crisis in arid regions of Isfahan province. This study aimed to assess the performance of three main desertification models including MEDALUS, MICD and FAO-UNEP for mapping desertification severity in the hotspot of Jarghuyeh region, eastern Isfahan. Different desertification indicators and their related indices were chosen based on the characteristics of the...

2010
Alan Grainger

This document presents proposals for the design and implementation of a Baseline Survey for the UN Convention to Combat Desertification (UNCCD). It has been prepared at the request of the Secretariat of the UNCCD. The Baseline Survey is to be initiated as part of the UNCCD's Ten Year Strategic Plan, and will form the starting point for monitoring long-term trends in desertification so that prog...

Journal: :مرتع و آبخیزداری 0
لیلا بخشنده مهر دانش آموختة کارشناسی ارشد بیابان‏زدایی دانشکدة منابع طبیعی دانشگاه صنعتی اصفهان سعید سلطانی دانشیار گروه مرتع و آبخیزداری دانشکدة منابع طبیعی دانشگاه صنعتی اصفهان عادل سپهر استادیار دانشکدة منابع طبیعی و محیط زیست دانشگاه فردوسی مشهد

according to the unccd definition, “desertification” is land degradation in arid, semi-aridand dry sub-humid areas resulting from various factors, including climatic variations andhuman activities. it has been recognized as a major economic, social, and environmentalproblem in many countries of the world. the medalus methodology is a practical approachto assess the present status of desertifica...

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