بررسی تعیین عوامل موثر در تخریب منابع طبیعی و سهم هر یک در تخریب در استان تهران

In this study,effective factors in destruction of range and forest area were studied in Tehran province.At the first step,Tehran provine were classified in four climatic regions as steppe,semi steppe,dry forest and high lands classes.At every climatic region some watersheds were selected as samples.In samples,technical parameters in field of range management and socio economical situations were studied.Land use map of samples were prepapred in 1955 and 2001 years,therefore changes of land use pattern were gotten.In every climatic region,production of vegetation cover were gotten and compared in used and exclosure ranges.According to results of the study,decrease of vegetation cover production in mountain is more than plain area.In plain area,range destruction is form ranges to cultivaited ,urban and industrial area.In user societies of ranges,poor villagers and nomades have the most share in destruction.One of the most important devices for conservation of ranges is land use planning in Tehran province.

Keywords:

منابع طبیعی , تهران (استان) , مرتع , عوامل فنی , عوامل اقتصادی , عوامل اجتماعی , تخریب مراتع , بهره برداران از منابع طبیعی , قرق اشتهارد , هومند , سیراچال , آزادبر , منطقه استپی , منطقه نیمه استپی , جنگل های خشک , کوه های مرتفع