extended abstractintroductionone of the basic challenges of governments, especially in developing countries, is to organize the desired national spatial structure in the changing urbanization. such a structure allows us to divide economic and social functions in the urban and regional hierarchy in a balanced manner. in most provinces and territories of iran, the urban hierarchy has formed compl...

fishing as one of the most important agricultural sectors has an important role in providing the protein for people. pareh cooperatives despite of having a long history, are faced with problems such as loss of fishing catch compare with previous years, the high cost of purchasing tools and equipments to catch and transportation and location of fishing become unfavorable due to natural and human...

Recent urban landscape vegetation surveys conducted in many cities in China identified numerous plant nutrient deficiencies, especially in newly developed cities. Soil nutrients and soil nutrient management in the cities of Hubei province have not received adequate attention to date. The aims of this study were to characterize the available nutrients of urban soils from nine cities in Hubei pro...

Sea shores of Gilan Province is one off the biggest tourist attractions in Iran. This area have valuable forests and grasslands. In addition it provides significant amount of corps like rice, tea, olive. Considering this facts, environmental protection of this area must be priority for national government. However waste management instruction have been ratified in Iran, there isn’t any specific...

Study on land ecological safety can help people acquire the states and changes of land ecosystem. It is of great significance to realize the reasonable utilization of land resource. The paper constructed an evaluation index system of land ecological safety based on Pressure-State-Response model. Then the paper combined fuzzy mathematics and matterelement theory to establish an evaluation model ...

Urban metabolism analysis has become a useful and effective tool to explore urban socio-economic processes. In this research, in order to explore the similarities and differences of metabolic characteristics and variation rules of different types of resource-dependent cities, we selected two cities—Taiyuan and Jincheng, the capital and a traditional resource-dependent city of Shanxi province, r...

breeding biology of the great cormorants phalacrocorax carbo sinensis is assessed in thesouthern coasts of the caspian sea, iran during the years 2008-2010. about 84 nests located on 63 trees wereexamined. nests were built on large trees located in abbas abad marsh, gilan province. initially, eggs werefound on first week of april and egg laying continued until the last week of may. clutch size ...