ارزيابي تطبيقي مهمترين عوامل موثر در توان اكولوژيك سه منطقه غربي ، مركزي و شرقي جنگل هاي شمال ايران

Effective factors on ecological capability in the northern forest of Iran.

Proper programming and multiple use of environment are based on evaluation of the potential of land. Understanding of land capabilities in forests and their classifications can facilitate programming. Site capability classification is based on the understanding of environmental and ecological specifications. In fact ecological land classification is a system that classifies regions or sites with relative homogeneity in variables or ecological resources. Aim of this research is ecological evaluation of capability in forest sites of Nav-Asalem, Lesakooti-Tonekabon and Ziarat-Gorgan, in the Caspian region. The studied sites were selected by on the bases of following criteria: elevation, dominance aspect, level of intervention and availability of primary data. After exploration of ecological resources, analyze of them by (GIS) and data ultimately, the map of homogeneous ecological unites was prepared. Evaluation of ecological capability of the sites was performanced by multi-factor method and Makhdoom model. Finally, the forest site capability was demonstrated in 7 capability classes and their maps were prepared. The results showed that slope percentage, elevation and vegetation density factors are effective factors which are common factors in all models. Distinctive components of specific models are depth of soil at specific model of Nav-Asalem forest, the type of parental material and soil evolution at the specific model of Lesakooti-Tonekabon forest and depth of soil and soil evolution at the specific model of Ziarat-Gorgan forest.