نتایج جستجو برای: land desertification

تعداد نتایج: 119172  

2003

Drought is perhaps the manifestation of desertification, which may be because of unprecedented soil erosion, large scale deforestation and abrupt change in micro-climate thereby increasing the temperature and reducing rainfall etc., ultimately leads to fall of groundwater level and hence, loss of agricultural productivity of the land, due to lack of water resources. Since, Indian Agriculture is...

In many countries, studies to determine the severity of desertification and providing land plans to implement desertification. One of the models is modified MEDALUS or Iranian model (IMDPA), has been used in present research in order to investigate desertification situation in the Tashk region of Fars province. In this research, the modified IMDPA model used with emphasis on the water, soil and...

Journal: :desert 2008
m. karimpour reihan a. salehpour jam m. k. kianian d. jahani

to investigate pedological criterion on land degradation in quaternary rock units, at first, a part of the shoor watershed area was selected. after distinguishing target area, slope classes, land use and geology maps were created, then map of units were founded by overlaying and crossing these maps. in this research three indices of erodibility, salinity and permeability of soils were considere...

In order to deal desertification phenomenon it is necessary to identify its producing and increases causes. For this purpose several studies conducted inside and outside the country that have been led to submit regional models.. Each of these models has different pattern and use different indicators which can lead to different results. In this study, Fakhrabad plain of Mehriz region by extent o...

Journal: :مرتع و آبخیزداری 0
سید محمود حسینی 2 کارشناس ارشد بیابان زدایی و عضو باشگاه پژوهشگران جوان دانشگاه آزاد اسلامی واحد ارسنجان، ایران محمدرضا اختصاصی دانشیار دانشکده منابع طبیعی و کویرشتاسی دانشگاه یزد، ایران علیرضا شهریاری دانشیار دانشکده منابع طبیعی دانشگاه زابل، ایران حامد شفیعی دانش آموخته کارشناسی ارشد بیابان زدایی، دانشکده منابع طبیعی، دانشگاه زابل، ایران

sistan plain is affected by desertification and this phenomenon has serious impacts on roads and socio- economic activities of local people of this region. the main purpose of this study is estimating the current and potential desertification intensity of niatak region of sistan based on micd method. that, through it the working units of this region were prepared as the base map for evaluating ...

In many countries, studies to determine the severity of desertification and providing land plans to implement desertification. One of the models is modified MEDALUS or Iranian model (IMDPA), has been used in present research in order to investigate desertification situation in the Tashk region of Fars province. In this research, the modified IMDPA model used with emphasis on the water, soil and...

Journal: :international journal of advanced biological and biomedical research 2014
mohammad ali hakimzadeh

in many countries, studies to determine the severity of desertification and providing land plans to implement desertification. one of the models is modified medalus or iranian model (imdpa), has been used in present research in order to investigate desertification situation in the tashk region of fars province. in this research, the modified imdpa model used with emphasis on the water, soil and...

Journal: :international journal of environmental research 0

land use of sylhet has changed gradually. this is found from the field survey that in 1970 the area was dominated by marshy land (645.33 katha), vacant land (430.88 katha) and crop land (336.17 katha). by 1988 there was no university in the area. residential area also increased. it covered 39.11 % of total study area. now in 2007 there is a radical change noticed in the area in comparison with ...

Journal: :international journal of environmental research 2012
b. basso l. de simone d. cammarano e.c. martin s. margiotta

the main factors affecting environmental sensitivity to degradation are soil, vegetation, climate and management, through either their intrinsic characteristics or by their interaction on the landscape. different levels of degradation risks may be observed in response to particular combinations of the aforementioned factors. for instance, the combination of inappropriate management practices a...

2017
Diana K. Davis Tor A. Benjaminsen

Drylands cover 40 to 45% of the earth’s land surface and harbour about 38% of people on the planet. The UN has claimed that up to 70% of drylands suffer from desertification, affecting 168 countries globally. This has led to desertification becoming the first globally defined environmental issue. Much has been written about problems with the idea of desertification and how it became such a powe...

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