Investigation of the effects in spatial changes of cushion species in the production of sediments by means of RUSLE model (Case study: Summer Rangeland of Jashlobar in Semnan)
Journal Title: International Journal of Farming and Allied Sciences - Year 2015, Vol 4, Issue 7
Abstract
Vegetation has a positive and important role in the hydrological cycle and also in or the reduction of erosion and sediments. Considering the rule or Based on / according to this role, a study was performed in the shrubberies of Rangeland in Semnan Province which the evaluation of cushion vegetation in prevention from production through sediment in the hillsides has been performed by RUSLE model in two sites. (In each of the two sites, with the distance of four_ kilometer apart,)In each site which has distance from each other, there are 6 standard plots (by 22.1 in 1.82 meter dimension) in two different slopes including 15 and 45%, which are in two directions of south and north. Gathering of the sediments and run offs at the end of these plots is performed and the length of the plots is in the direction of hillside's slope. Regarding the results or Based on the results which are related to the simple linear regression at the first site, increase of cushion plant vegetation in the middle of hillside highly has been decreased sediments and at the second site, in the lower part of hillside, by increasing of cushion plant vegetation with more amounts, the produced sediments has been reduced. In the middle part of hillside, with little difference than its lower part, the more effect had been in comparison with upper part and in comparison, two sites in the middle part of hillside than lower and upper parts of hillside, the increase of cushion plant vegetation highly caused reduction of the produced sediments from hillside. The investigation of efficiency of RUSLE model was performed by means of comparison the computational amounts with observational amounts, by Nash-Sutcliffe method for computational amounts of -0.103 for the first site and -0.065 for the second site which showed non-efficiency of the model in this area. It seems that the obtained results from this model have not had or has no high accuracy for estimation of sediments resulted from cloudbursts in the present study.
Authors and Affiliations
Mehrnoosh Parsa, Abdorreza Bahremand, Hamidreza Saeidi Goraghani, Mohammad Hassan Jouri and Ali Asghar Hashemi
Keywords
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