Overgrazing is one of the most primary causes of desertification in semi-arid zones of China. From 1992 to 1994 we conducted a grazing experiment in Naiman (lat. 42◦58′N, long. 120◦43′E, 345 m asl), Inner Mongolia, China to elucidate desertification mechanisms. Our experimental field, which was covered with some short grasses, legumes and forbs, included four plots where grazing sheep numbers d...

more than 80% of iran’s area has arid and semi arid climate. therefore, iran is exposed to desertification process. practical activities in controlling desertification must be based on current desertification situation and its severity. based on this theory, evaluating desertification rate indices in khezrabad region was done based on imdpa model. in this research two factors with 10 indices we...

Rangelands are expansive, unimproved lands located in arid or semi–arid regions, spanning a variety of landscapes including savannahs, high and low altitude deserts, mountain meadows, and tundra. Rangelands are generally unsuitable for crop production due to aridity, topography, and extreme temperatures. Rangelands support varying mixtures of native and nonnative grasses, grass–like plants, for...

Land degradation especially as a result of the rapid increase in demand and pressure population, have emerged one most important problems. Many model approaches, regarding land desertification, been developed continue to be on world. The MEDALUS (Mediterranean Desertification Use) which is famous models has for an environment assessment program contributed by 31 groups 10 countries 1999. This i...

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...

The kind of land use and intensity of its change is considered as important desertification indices in different models. Land use change is one of the main anthropogenic factors in the desertification. The current research was carried out around Imam Khomeini airport, with an area of 32000 km2, in order to evaluate mentioned area's land use changes effects during 1955-2003 on desertification. T...