نتایج جستجو برای: combating desertification indices

تعداد نتایج: 91264  

Journal: Desert 2005
A. Rafiei Emam GH. Zehtabian, H. Ahmadi H. Khosravi

Desertification process as a great problem affects most of the countries in the world specially developing countries. This process has a high rate in arid and semi-arid countries such as Iran. The main objective of this research was to investigate land degradation status and desertification mapping of Kashan area. Different studies have been carried out in the world in order to assess desertifi...

Journal: :desert 2013
h. ahmadi h. azarnivand m.r. ekhtesasei m. tazeh

there have been different indices identified for desertification. among these is technogenic desertification index which seems much more efficient. in this study, some of technogenic desertification indices were studied and evaluated. first land use maps of the region were taken from irs-pan satellite image and aerial photos analysis. after evaluating the area of different uses, lands that had ...

Today, degradation of soil and water resources are the most important factors of desertification in arid and semi-arid areas as a result of mismanagement and improper human behavior. Enforcement measures in relation to desertification control have to be based on knowledge of the current state of desertification risk and its severity. In the present study, to evaluate the risk and severity of de...

ژورنال: علوم آب و خاک 2013
حمیدرضا کریم‌زاده, , رضا جعفری, , علی خنامانی, ,

Soil characteristics are the most powerful factors in desertification phenomenon. The purpose of this study was investigating soil characteristics as indices for evaluating desertification intensity. The most important indicators of the soil that affect desertification were selected in the present study. Soil samples were taken from Segzi desert vicinity located in the east of Isfahan city with...

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...

2002
Zhang Fengrong Wang Lixin Li Chao

YiJinHuoLuo Banner is a county of Inner Mongolia with obvious semiarid monsoon climate. Because of unsuitable land use, such as cultivating marginal land and over pasture, desertification was getting severer and severer before 1974. Since 1974, People have been doing their best to grow woods, shrubs and grasses for increasing the coverage of vegetation. People have taken suitable and available ...

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. ...

Journal: :مرتع و آبخیزداری 0
ریحانه مسعودی دانشجوی دکتری بیابان زدایی، دانشکدة منابع طبیعی دانشگاه تهران غلامرضا زهتابیان استاد دانشکدة منابع طبیعی دانشگاه تهران حسن احمدی استاد دانشگاه آزاد اسلامی ـ واحد علوم تحقیقات تهران شهرام خلیقی سیگارودی دانشیار دانشکدة منابع طبیعی دانشگاه تهران

desertification is a major problem in many countries. international efforts have been considered to combat and prevent this phenomenon. the most important cases of these measures are the united nations convention to combat desertification. in this study, imdpa model and gis were used to assess desertification phenomena in kashan plain. some indices of climate and water criteria were selected to...

Recognition of desertification criteria and indices and determining the most effective factors on it are the first steps for logical planning to combat desertification. In this study, the sensitivity of the Jaz-Murian region to desertification was evaluated using IMDPA model which is one of the desertification assessment methods in arid and semi-arid regions, on the basis of geology-geomorpholo...

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