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Studying Effective factors in selection of understory farming lands and there effects on forest stands using GIsMaterial and Method Study area The study area locates in ILam provinces (33º 40' N, 46º 25' E) in west of Iran comprising the furniture common law of the cheshme khazane village. (Fig1). Mean annual rainfall of region is 612 mm that mainly falls in autumn and winters. Mean temperature is 16.6 ºC that ranges between -12.6 ºC and 38.8 ºC. Based on Demartin dryness Index, the climate of study area is Mediterranean and dry period is 5 months (jaziresi & ebrahimi rostagi, 2003).  Fig 1: the study area in Iran and Ilam province Data Forest types characterizing by canopy cover, diameter classes, high classes and origin and understory farming lands surroundings were surveyed by GPS. Then gathered data were used as inputs for GIS. Due to lack of digital maps of region, topographic Lines were digited from paper map By R2V software. Using digited map the slope, elevation, proximity to village and aspect maps were created. Map of unuderstory farming lands overlaid to these maps. Results Forest types indicate that in the region oak (Quercus persica) specie is the main specie and most of type are comprised purely this (table 1 and fig 2). In understory farming lands only pure oak type accrues but in another parts of forest area used for grazing and fuel wood in addition to this type, mixed types including Specie, Acer monspessulanum, Amygdalus sp. , ficus sp. , PIstacia mutica , P. khinjuk ,Ddaphnia sp. And Cratagus sp. Occurs   Fig 2: distribution of forest types in farmed and unfarmed understory In farmed region, Trees have seed origin and comprised tree with high diameter and height but in another part the forest stands have coppice or high origin. In these areas the forest canopy cover is less than unfarmed areas of forest. Overlying the map of farming land with slope map indicates that these areas are not limited in gentle slope but most of them are in gentle slope (fig: 3a and 3b). Distribution of understory farming lands in aspect classes' show that most of them occur in north and east aspects (fig 4a and 4b). These areas occur in low elevation (fig 5a and 5b) and proximity to village (fig 6a and 65b) does not important role in site selection of understory farming lands. |