The study of the exclosure effects on the vegetation changes under grazing and non-grazing conditions in the rangeland areas has particular importance in the rangeland improvement and revivification projects. The research was accomplished in semi-steppe KhoyBilehvar area, from 1999 to 2005. Vegetation cover was annually measured within fixed plots during transact. The results showed that […]
The objective of this study was to assess the relationship between vegetation, landform and physicochemical properties of soil. At the first terrain map unit were provided using the landsat thematic mapper (TM) satellite images, aerial photograph, topographical and geology map. Field sampling was done in the representative area using plot sampling. 104 plots 100 m2 […]
Soil physical properties have an important role on vegetation growth through affecting the development of root system. The aim of this study was to investigate the trampling effect of livestock grazing on soil physical properties and vegetation cover changes. The experiment was conducted on three range condition sites (Reference, Key and Critical area) with ten […]
Arshadchamani rangelands are placed in the north foothill of Sahand Mountain and near Kandovan Village. Therefore, it has plant diversity and economical values. In this region, medicinal plants are cut and sold by the stores with non-standard packaging without scientific name. Regarding the economical value of medicinal plants and thereby the investment necessity on these […]
Rangeland ecosystems shift across dynamic thresholds between different ecological states in response to natural or human-induced factors. These different ecological states are the result of interactions among climate, soils, grazing history, and management practices. The notion of a single ‘‘pristine’’ final state is only conceptual in nature, and because of this, dynamic thresholds and the […]
The machine to be designed and developed with a view to resolve one of the irksome problems of this institute has been facing every year. This institute is surrounded by vast non- fertile land area of about 200 acres, which becomes widely occupied by numerous breads of bushes and shrubs during post-rainy season. Due to […]
Evaporation is one of the most important components of hydrologic cycle. Accurate estimation of this parameter is used for studies such as water balance, irrigation system design, and water resource management. In order to estimate the evaporation, direct measurement methods or physical and empirical models can be used. Using direct methods require installing meteorological stations […]
Generation mean analysis was carried out to estimate the nature and magnitude of gene effects for sugar yield and its component traits in sweet sorghum [Sorghum bicolor (L.) Moench. Six basic generations, namely P1, P2, F1, F2, BC1P1, BC1P2 of four crosses involving seven diverse parents were evaluated in rainy 2009. The mean performance of […]
In recent years, the occurrence of water and wind erosion in different parts of country due to the changes of land use from the forest and pasture into the agricultural and also construction of communication lines have increased. The study and research on this phenomenon, the effective factors in creating them and also identification of […]
One of the main resonator factors in watershed soil erosion is inappropriate land management including conversion of pasture land to dry-land farming. Unfortunately, the changes of Gara Su watershed usages have been very common. Thus, in order to understand the influence of land use on runoff rate and soil loss, soil losses were investigated and […]