عوامل تخریب مراتع استان و سهم هر یک از عوامل در استان همدان

Importance of ranges and jungles as part of reproducible resources caused many caused many researches and studies. Land degradation and its factors can acquire in many books articles but which factor in each area is available or absence? Each factor has what portion of destruction of these areas? In this research these factors in hamedan province surveyed .Base of study for dividing of province and choice of samples and analyze and generalization is HANRY PABO's map of Iran. In this research many methods used: area) with map of sample areas (for 1334(solar hegira) and 1374 the changes of land use and ambit of ranges surveyed (by ILWISS software). Vegetation of sample areas surveyed, condition, trends of natural vegetation, actual product and potential product of ranges estimated. In this research 3 questionnaires used, one for survey of opinions of experts, one for sample families and another one for view points of benefices of ranges. In results of each 3 questionnaires, First factor is ranching. From view point of experts after this factor is mining and then change of range to agriculture lands by plow of these lands. On base of analyze of total finding in questionnaires of families and benefices there is a relationship between index of destruction of ranges and income of ranchers.