نتایج جستجو برای: technogenic desertification

تعداد نتایج: 2649  

2002
Victor R. Squires

Desertification is a major human tragedy, affecting the daily lives of about 1 billion people. It is this aspect of desertification that deserves further consideration. As a humanitarian effort it is an opportunity, and an obligation, for the industrialized nations to transfer financial support and technical assistance to those countries worst affected by land degradation in all its forms. Dese...

2007
Cui Linli Fan Wenyi Zhiqiang Gao

Desertification is a worldwide concern and the assessment of aeolian desertification has become one hotspot in global ecosystem research. In this paper, hyperspectral data acquired from modular OMIS-I imaging spectrometer, combined with ETM data and field survey data, was used to assess the aeolian desertification in Korqin Sand, Inner Mongolia, China by pixel-level. The results indicated that ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2015
Armel T Kaptué Lara Prihodko Niall P Hanan

Over many decades our understanding of the impacts of intermittent drought in water-limited environments like the West African Sahel has been influenced by a narrative of overgrazing and human-induced desertification. The desertification narrative has persisted in both scientific and popular conception, such that recent regional-scale recovery ("regreening") and local success stories (community...

2017
Carlos Arturo Aguirre-Salado Eduardo Javier Treviño-Garza Oscar Alberto Aguirre-Calderón Javier Jiménez-Pérez Marco Aurelio González-Tagle José René Valdez-Lazalde Luis Potosí

Journal: :desert 0
m.h. sadeghi ravesh assistant professor, faculty of agriculture, islamic azad university, takestan branch, takestan, iran h. ahmadi professor, islamic azad university, science and research branch, tehran, iran gh.r. zehtabian professor, faculty of natural resources, university of tehran, karaj, iran m. tahmoures phd. student, faculty of natural resources, university of tehran, karaj, iran

due to increasing importance of desertification challenges and its consequences the necessity of sustainabledevelopment achievement in arid and semi-arid regions is essential in order to avoid limited sources asting, increase the efficiency of controlling, reclamation and restoration projects of natural areas. based on the iterature review, it has been recognized that combating desertification ...

Journal: :global journal of environmental science and management 0
m. akbari department of watershed and arid zone management, faculty of range land and watershed, gorgan university of agricultural sciences and natural resources, gorgan, iran m. ownegh department of watershed and arid zone management, faculty of range land and watershed, gorgan university of agricultural sciences and natural resources, gorgan, iran h.r. asgari department of watershed and arid zone management, faculty of range land and watershed, gorgan university of agricultural sciences and natural resources, gorgan, iran a. sadoddin department of watershed and arid zone management, faculty of range land and watershed, gorgan university of agricultural sciences and natural resources, gorgan, iran h. khosravi department of arid and mountainous regions reclamation, faculty of natural resources, university of tehran, tehran, iran

risk assessment provides the possibility of planning and management to prevent and reduce the risk of desertification. the present study is aimed to assess the hazard and risk of desertification and to develop management programs in the semi-arid western regions of golestan province in iran. desertification rate was obtained using the iranian model of desertification potential assessment. since...

Journal: :مرتع و آبخیزداری 0
الهام السادات شکوهی دانش آموخته کارشناس ارشد مدیریت مناطق بیابانی، دانشکده منابع طبیعی، دانشگاه تهران، ایران. غلامرضا زهتابیان استاد دانشکده منابع طبیعی، دانشگاه تهران، ایران. علی طویلی دانشیار دانشکده منابع طبیعی، دانشگاه تهران، ایران.

more than 80% of iran’s area has arid and semi arid climate. therefore, iran is exposed to desertification process. practical activities in controlling desertification must be based on current desertification situation and its severity. based on this theory, evaluating desertification rate indices in khezrabad region was done based on imdpa model. in this research two factors with 10 indices we...

Journal: :Environmental Conservation 1982

Journal: :EPL (Europhysics Letters) 2014

2014
Junhong Zhang

Karst rocky desertification is a geo-ecological problem in Southwest China because of nature and man-made factors, which restricts the development of local economic and social. Soil and water erosion is one of the most harmful form of rocky desertification, but the management methods still keep in the exploratory stage. Biological soil crust is the organic complexes of biotic components includi...

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