6564

6129

كارشناسي ارشد

مرتعداري

اصفهان: دانشگاه صنعتي اصفهان، دانشكده منابع طبيعي

1390

چهارده، 86ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

مهدي بصيري، مصطفي تركش

مجيد ايرواني، عبدالرضا مهاجري

19/1/91

محمدرضا وهابي، مصطفي سعيدي فر

1396/10/10

كتابنامه

منابع طبيعي

مهندسي منابع طبيعي

ID6129

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Effect of Grazing on Species Diversity of Ranglands and Abandoned Drylands in Fereydan Isfahan Haniyeh Eghdami Email Address honey ei2002@yahoo com 3 Oct 2011 Department of Natural Resources Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Mehdi Bassiri Mostafa Tarkesh Email Address bassiri em@yahoo com Abstract Species diversity index is an important indicator of rangelands health This index bears vitaleffect on determination of ecosystems in general as well as rangelands in specific for assesmentconditions and sustainability In this study three sites were selected as follows good rangeland degraded rangeland and abandoned dryland Samples were taken in four replications in each site Percent of vegetation cover and plant density were determined Number of species was determined byminimal area method as well as some edaphic factores in all sites Distance from roads village andwatering points were measured for each site Non parametric indices such as species richness evenness and diversity were calculated From parametric methods aboundance ordinal models wereapplied to evaluate species diversity Curves of areas vs species were drawn using semi logarithmicregression equations and their correlation coefficients were determined Ordination technique wasrendered to investigate the relationships between presence of species and environmental factors Basedon the results of this study significant differences 1 were observed between species richness ofstudied sites using margalof jacknife and rarefaction indices Nonetheless rarefaction methodemerged to be the most determinant Amongest the non parametric indices for species diversity theHill N1 and Shanon Wainer revealed significant differences between sites 5 Aboundance ordinal method showed that data follow log normal trend Minimal areas for species richnessdetermination were about 128 32 and 16 square meters for good and degraded rangelands as well asabandoned dryland sites respectively Distance from village roads and watering points weresignificantly 1 effective on species richness and species diversity and farther a way from theselocations these indices increased and distance from village was the most effective one Speciesdiversity had positive relationships with organic matter moisture saturation lime and claypercentages Wherease this index had negative relationships with sand percentage and soil electricalconductivity Keywords species diversity species richness Fereydan good rangeland degradedrangeland abandoned dryland ordination

مهدي بصيري، مصطفي تركش

مجيد ايرواني، عبدالرضا مهاجري

محمدرضا وهابي، مصطفي سعيدي فر