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Studying Effective factors in selection of understory farming lands and there effects on forest stands using GIs Fig 3a: distribution of farming land in slope classes  Fig 3b: distribution of farming land area in slope classes  Fig 4a: distribution of farming land in aspect classes  Fig 4a: distribution of farming land area in aspect classes  Fig 5a: distribution of farming land in aspect classes  Fig 5a: distribution of farming land area in aspect classes  Fig 6a: distribution of farming land in proximity to village  Fig 6a: distribution of farming land area in proximity to village Discussion In zagros forests, non irrigated farming in understory is common. This manner result in decline in canopy cover and reduce the species of forest. The most effective factors in site selection of these areas are slope, aspect and elevation. Most of these areas are limited in gentle slope but some of them occur in step slope. In low elevation, north aspect due to better soil and water condition these farming lands are more. Decline of canopy cover make these areas the main center of erosion. Distribution of areas in gentle slope is due to attention of people to water and soil conservation, but for better conservation expansion of areas must be limited.
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