2833

2789

كارشناسي ارشد

خاكشناسي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1383

هجده، 110،[II]ص.: مصور، جدول، شكل، نمودار

احمد جلاليان، مصطفي كريميان اقبال

احمد خاتون آبادي، بهزاد قرباني

محمدعلي حاج عباسي، حميدرضا كريم زاده

1396/10/26

كتابنامه

كشاورزي

مهندسي كشاورزي

ID2789

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

AbstractForestsand pasturesplay an importantrole in everycountriesnatural ecosystem The goals ofthis studywere to assess effect of land usechange the geologicforn1ations socioeconomic andfactors on land degradationin a parts of Koohrangarea CheharMahal Bakhtiati Province Forassessment degradationin different formation soil erosionmapswere preparedaccording landto BLM Bureauof land management method To studythe role of geologic formation in landdegradation different formationswith differentpropertieswere chosenin the area The first twoformation from Paleozoicperiod was composeof conglomerate sandstoneand shale and thesecondformation from Certaceousperiod was composed marIn and shale Three different ofland use including pasture dryland farming and a degradedpasture were selected in eachgeologic formation In each land use three soil sampleswere taken from 0 10 and 10 20centimeterdepth Soil properties including physical analyses bulk density infiltration meanweight diameter plasticity index and erodibility factor and chemicalanalyses organic matter total nitrogen available phosphorous were measurefor eachsoil sample For socioeconomicstudies questionnaires were preparedfor a supervisedsurveyin two villages in the studyarea Nasirabadwatershed Using a censusmethod questionswere asked from villagers aboutfactorsthey think would affect land degradation suchas grazing kinds of pastureownershipandcutting woods for fuel consumption The analysis of variance of physico chemicalcharacteristicsin randomized complete designmethod and comparisonof meanswas doneusing LSD test Results from the degradedsites in both geologic formations showed a 25percentincreasein bulk density significantincreasein plasticity index and significantdecreasein meanweight diameter organic matter and total nitrogencontent Soil erodibility index didnot showa significant changefrom the pasturesite to degraded in both geologicformations siteThe influence of geologic formation on land degradation was clearly obvious in the field fromnumerouslandslidesoccurring in this formation Apparentlythe silica cementedconglomeratelayer in the Paleozoic formationwas influential in the landslideby impedingwater infiltration The socioeconomicstudy in the area indicates a good awarenessin local people about thefactors affectingland degradationsuchas overand early grazingand soil erosionhazardsin thearea The soil erosion map which was preparedfor the studyarea showed6 1 percentof landshad very high erosionrate 24 5 percenthigh erosion 63 4 percentmoderateerosionand 1 05percent low erosion The most sever erosion was observed in dissectedplain geomorphicsurfaces the past thesesurfaceswere pastureland which have beenchangedto cultivation Inland The land use changehas accelerated erosionrate in thesesurfaces Overgrazingand thecuttingwoods for fuel have also accelerated erosionand land degradation the area Joint soil inownershipof pasturelands and lack of private ownership beeninfluential in acceleration has ofland degradation The results from this research indicate that conservation measures haveto beimplementedin orderto preventfurther degradation the area in cl I ljl 1 I v li J v V IJI 1

احمد جلاليان، مصطفي كريميان اقبال

احمد خاتون آبادي، بهزاد قرباني

محمدعلي حاج عباسي، حميدرضا كريم زاده