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Paper Information

Journal:   IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH   FALL 2017 , Volume 24 , Number 3 (68) #R00445; Page(s) 581 To 595.
 
Paper: 

Assessment of rangeland degradation based on increasing distance from critical centers in Northern slopes of Sabalan

 
 
Author(s):  GHORBANI A.*, POURNEMATI A., Pourali a., BADRZADEH M., TEYMORZADEH A.
 
* Department of Range and Watershed Management, University of Mohaghegh Ardabili, Ardabil, Iran
 
Abstract: 
The aim of this study was to investigate the feasibility of using the framework of grazing gradient for the assessment of rangeland degradation in Northern slopes of Sabalan. In three villages including HeydarAbad, GholiBiglo and ArbabKandi, vegetation and soil samples were taken from a 100-m transect with 1 m2 plots in heavy, medium and light grazing intensity. Analysis of variance and mean comparison results showed that in the GholiBiglo village, changes in the phytomass at the first, second and third distances were 84. 60, 100. 90, 119. 80 kg/ha and canopy covers 33. 10, 35. 90, 43. 20 %, respectively, which had an increasing trend according to the research hypothesis (P<0. 05); however the hypothesis was not confirmed in ArbabKandi and HeydarAbad villages (P>0. 05). In the analysis of mean for three villages, parameters such as species density, stone and gravel, litter, sand, acidity and salinity had notable change trends (P<0. 05); however, other parameters did not confirm the hypothesis (P>0. 05). In ArbabKandi village, species diversity and evenness indices had an increasing trend, but they had no distinguished trend in the GholiBiglo village. In HeydarAbad village, diversity indices had a decreasing trend; however, the evenness indices did not follow a notable trend. Results of multivariate analysis indicated that sites with different grazing conditions cannot be separated. In the north of Sabalan mountain, changes in vegetation and soil factors are not only affected by grazing gradient, however, other factors such as elevation and its dependent variables are the effective factors at different distances from the critical center. According to the species composition and occurred land use change and degradation on these rangelands, and the distribution of critical centers, it is not appropriate to use this framework in the assessment of rangeland degradation.
 
Keyword(s): Grazing gradient,critical center,grazing intensity,species composition and diversity,Ardabil province
 
References: 
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