Land Use Assessment on Gomishan Plain (With Emphasis On Soil Characteristics)

As we know ecological condition in terms of drought, lack of precipitation, salinity of soil and water level restricted restoration to life of plant layer, so selection the best managerial procedure is very important while in order to provide vegetation also has the capability to decrease the soil erosion .All of all this research concerning to one of the unique ecosystem zone salinity, high water level which due to several years ago, as a result of the overload grazing of animals cause destruction the power of generation, finally to intensify the soil erosion of the region.

For the purpose of investigation about the role of land use and its effects on soil surface two areas included of farmland and rangeland closest to the area which has fenced for 21 years.For measuring physical specification (texture and structure) and also chemical specification (nitrogen, PH, EC, organic material), Taking sample of soil from each of these zones is done. Sampling method for this matter is in according to the procedure that consists of taking 3 transect with 100(meters) long in each zone and in along each transect taking 3 sample up to 15 (centimeter) deep by using spade.In order to measuring the amount of permeability of the soil in each zone (exclusion, rangeland, dryland farming) in 3 times and in all of these 3 situation.Altogether, 9 experiments are done.

The result of these experiments indicates that exploitation in form of rangeland and dryland farming has not meaningful effect on the soil texture, but the compressibility of soil surface increased. Consequently there was not any effect on the nitrogen and organic material of the soil.Land use in form of dryland farming increase EC factor of soil and in form of rangeland has no any meaningful effect on EC. The result of soil permeability experiment shows averagely, soil permeability in exclusion area approximately 10 times to the rangeland and 9 times to the dryland farming.

With regard to the dangerous of desertification in this zone, it should be hesitate to exploitation in any form of land use (farming and pasture). In view of successful of researching exclusion, salinity decreases and increasing in soil permeability, exclusion should be considered as an amendatory method.Dry farming can cause high salinity and decreasing soil permeability, for this reason with attention to the low raining in this zone it is required that farmland convert to the implant pasture.