نتایج جستجو برای: land degradation

تعداد نتایج: 264605  

Today, there are many factors affecting watersheds, consequently changing natural ecosystems succession. The aim of this study was to investigate the effect of drought events on land use changes at Doiraj Watershed of Ilam Province from 1996 to 2015. For this purpose, Landsat satellite images were used for land use change monitoring and Standardized Precipitation Index (SPI) was applied for dro...

2016
Geoff A. Wilson Giovanni Quaranta Claire Kelly Rosanna Salvia

This study analyses social, economic and political ‘lock-ins’ for understanding community resilience and land degradation. The study focuses on lock-ins from within communities, using four case study communities in Italy affected by land degradation. The analysis highlights the complex interrelationships between various lock-ins, and suggests that the communities are on pathways of declining re...

Journal: :Environmental management 2014
L Fleskens D Nainggolan L C Stringer

Scenario analysis constitutes a valuable deployment method for scientific models to inform environmental decision-making, particularly for evaluating land degradation mitigation options, which are rarely based on formal analysis. In this paper we demonstrate such an assessment using the PESERA-DESMICE modeling framework with various scenarios for 13 global land degradation hotspots. Starting wi...

2003
Paul M. Beaumont Robert T. Walker

This paper addresses the relationship between property regimes and land degradation outcomes, in the context of peasant agriculture. We consider explicitly whether private property provides for superior soil resource conservation, as compared to common property and open access. To assess this we implement optimization algorithms on a supercomputer to address resource decision-making of individu...

2011
H. I Jimoh

This work is an assessment of perpetuated land degradation phenomenon and the attendant consequences in the oil producing areas of Nigeria. Certainly, following the oil production, is the emergence of squalors, generally run down environmental settings, erosion problems, general environmental degradation, pollutions among others. Thus, land reclamation efforts for effective uses constitute as a...

Journal: :journal of agricultural science and technology 2014
m. masoudi

the entire land in the southern iran faces problems arising out of various types of land degradation, of which the vegetation type forms one of the major ones. the payab basin (522,470 ha), which covers the lower reaches of mond river, was chosen for a test risk assessment of this type. the different kinds of data for indicators of vegetation degradation were taken from the records and publishe...

2003
Alfredo Huete Tomoaki Miura Xiang Gao Carlos Borghi Ricardo Ojeda

Land degradation impacts on several critical environmental issues such as food security, diminishing quality and quantity of fresh water resources, preservation of natural resources, loss of biodiversity, and global climate change. Land degradation is responsible for soil erosion and can eventually lead to desertification. The International Convention to Combat Desertification (CCD) defines des...

2013
Olena Dubovyk Gunter Menz Christopher Conrad Elena Kan Miriam Machwitz Asia Khamzina

Advancing land degradation in the irrigated areas of Central Asia hinders sustainable development of this predominantly agricultural region. To support decisions on mitigating cropland degradation, this study combines linear trend analysis and spatial logistic regression modeling to expose a land degradation trend in the Khorezm region, Uzbekistan, and to analyze the causes. Time series of the ...

2003
John Quiggin

Expansion of agriculture into new regions has often been followed by land degradation. In this paper, it is argued that the process of land development involves the selection of pioneer's with optimistic expectations about the robustness and carrying capacity of new land. Hence, there is a systematic bias towards over-exploitation and land degradation. The argument is shown to be an extension o...

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 ...

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