Habitat suitability modeling Stipa barbata species using Ecological Niche Factor Analysis (case study: Taleghan Rangelands)

Subject Areas : forest

محمدعلی زارع چاهوکی ¹ , محبوبه عباسی ²

1 - دانشگاه تهران
2 - دانشگاه تهران

Received: 2016-05-06 Accepted : 2017-02-26 Published : 2017-02-19

Keywords: Stipa barbata, Ecological niche factor analysis, Taleghan rangeland,

Abstract :

This study was done aimed to determine the habitat suitability of S. barbata species using ecological niche factor analysis in rangeland of Taleghan miany. Stipa barbata species has good quality and the preference value that is important in soil conservation and forage production for livestock. In order to habitat suitability modeling for this species were used than presence point and the soil variables such as the information layers of gravel, pH, lime, organic matter, N, K, P, sand, clay, silt and topographic variables maps (slope, aspect and Height) were used as variables affecting the species. The results of the study indicate that in the habitat suitability of S. barbata species in the study area environment variables height, direction of North, EC has a negative impact and depth, lime, organic matter and pH variables has a positive impact, And have been important factors. Accuracy model is calculated 87/5% using continue Boyce index that to verify the accuracy of the model results. Kappa coefficient obtained by matching the prediction map with ground truth equal 0.76. According to the results obtained values marginality (1.64), specialization (8.39) and toleranc of (0.119) obtained from the model, it can be concluded that the S. barbata species is specialty relative to the specific conditions of the environment variables, and tolerate the specific domain of environmental variables in the range the study area.

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