نتایج جستجو برای: land desertification
تعداد نتایج: 119172 فیلتر نتایج به سال:
About two billion rural individuals depend on agricultural systems associated with a high amount of risk and low levels yield in the drylands Asia, Africa, Latin America. Human activities, climate change natural extreme events are most important drivers desertification. This phenomenon has occurred many regions Iran, particularly villages periphery central desert made living oases so difficult ...
Natural and anthropogenic causes jointly lead to land degradation eventually desertification, which occurs in arid, semiarid, dry subhumid areas. Furthermore, extended drought periods may cause soil exposure erosion, and, finally, desertification. Several climatic, geological, hydrological, physiographic, biological, as well human factors contribute This paper presents a methodological procedur...
1. Desertification negatively impacts a large proportion of the global human population and > 30% of the terrestrial land surface. Better methods are needed to detect areas that are at risk of desertification and to ameliorate desertified areas. Biological soil crusts are an important soil lichen-moss-microbial community that can be used toward these goals, as (i) bioindicators of desertificati...
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. ...
OCTOBER 2004 AMERICAN METEOROLOGICAL SOCIETY | A erosols are airborne suspensions of tiny particles, each typically about one-thousandth the diameter of the period at the end of this sentence. Cumulatively, they have profound effects at a variety of scales, exerting myriad influences on the earth’s environment and climate and on human health. Many aerosols originate from natural sources—volcano...
Guangxi Province is one of the regions more serious desertification. This paper using ENVI image processing system, according to remote sensing image interpretation target mark and image spectral characteristics, found remote sensing interpretation model of the background information of forest, shrub and grass, agricultural land, surface water, towns, roads from TM and ETM data from 1988 to 200...
OCTOBER 2004 AMERICAN METEOROLOGICAL SOCIETY | A erosols are airborne suspensions of tiny particles, each typically about one-thousandth the diameter of the period at the end of this sentence. Cumulatively, they have profound effects at a variety of scales, exerting myriad influences on the earth’s environment and climate and on human health. Many aerosols originate from natural sources—volcano...
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 ...
Abstract Nowadays, Desertification is one of the greatest environmental challenges. It is a global issue and its serious consequences affect on biodiversity, environmental safety, poverty eradication, economic and social stability and sustainable development around the world. Despite the serious environmental, social and economic impact of desertification phenomenon, few studies have been done...
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