نتایج جستجو برای: land desertification

تعداد نتایج: 119172  

2016
Lili Feng Zhiqing Jia Qingxue Li

Aeolian desertification is poorly understood despite its importance for indicating environment change. Here we exploit Gaofen-1(GF-1) and Moderate Resolution Imaging Spectroradiometer (MODIS) data to develop a quick and efficient method for large scale aeolian desertification dynamic monitoring in northern China. This method, which is based on Normalized Difference Desertification Index (NDDI) ...

2016
Takafumi Miyasaka Toshiya Okuro Xueyong Zhao Kazuhiko Takeuchi

Previous field research on the Horqin Sandy Land (China), which has suffered from severe desertification during recent decades, revealed how land use on a sand-dune topography affects both land degradation and restoration. This study aimed to depict the spatial distribution of local land use in order to shed more light on previous field findings regarding policies on a broader scale. We perform...

Journal: :Frontiers in Physics 2023

In recent years, with the abnormal global climate change, problem of desertification has become more and serious. The vegetation pattern is accompanied by desertification, thus, study helpful to better understand causes desertification. this work, we reveal influences hydrotropism on based a vegetation–water system in form reaction–diffusion equations. Parameter ranges for steady-state mode obt...

2013
Sanneke van Asselen Peter H. Verburg Jan E. Vermaat Jan H. Janse

Meta-analysis of case studies has become an important tool for synthesizing case study findings in land change. Meta-analyses of deforestation, urbanization, desertification and change in shifting cultivation systems have been published. This present study adds to this literature, with an analysis of the proximate causes and underlying forces of wetland conversion at a global scale using two co...

Journal: :Sustainability 2022

The aeolian desertification in Mu Us Sandy Land (MUSL) northern China have been paid much attention, but the relative contributions of climate change and human activities to dynamics are still not clear. Based on Landsat MSS, TM, ETM+ OLI images 1975, 1990, 1995, 2000, 2005, 2010 2015, we developed a database land distribution, discussed spatial temporal variation desertification, discovered re...

2016
Long Wan Jing Tong Jinxing Zhou Hongyan Guo Ming Cui Yuguo Liu Like Ning Fukai Tang

Over the past several decades, rocky desertification has led to severe ecological problems in karst areas in South China. After a rocky desertification treatment project was completed, the vegetation coverage changed greatly and, consequently, increased the ecology water consumption (approximately equal to the actual evapotranspiration) of the regional vegetation. Thus, it intensified the regio...

2015
Donald A. Wilhite

Drought is a complex, slow-onset phenomenon that affects more people than any other natural hazard and results in serious economic, social, and environmental impacts. Although drought affects virtually all climatic regimes and has significant consequences in both developed and developing countries, its impacts are especially serious in developing countries where dryland agriculture predominates...

Journal: :desert 2008
t. shamekhi h. mohammadi kangarani j. l. blanchez

desertification of the arid and semi-arid lands of the world has been proceeding for more than a thousand years.human-induced degradation in these areas is regularly cited as one of the principal causes of desertification.euphrates and tigris basin as the case study of this research in some aspects is almost unique in the world. but thisbasin has been confronted to progressive desertification. ...

Introduction: Desertification is the process of ecological and biological reduction of land potential in a natural or unnatural way, mainly affecting arid regions. Moreover, it decreases land efficiency with increasing acceleration. Land resources and human populations exposed to desertification and land destruction are prone to various threats, including loss of land productivity, food insecur...

Desertification is a global problem in most arid and semiarid countries including Iran are facing with this problem. Desertification causes many restrictions in terms of agriculture, food security, livestock rising, industry and providing service costs. This phenomenon is a process which gradually developed and accelerated and adjustment costs is increasing exponentially, so according to resour...

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