3786

3577

كارشناسي ارشد

خاكشناسي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1386

دوازده، 154، [II] ص.: مصور، جدول، نمودار

ص. ع. به فارسي و انگليسي

حسين خادمي، حميد رضا كريم زاده

مصطفي كريميان اقبال

4/10/86

شمس الله ايوبي، سعيد اسلاميان

1396/03/08

كتابنامه

كشاورزي

مهندسي كشاورزي

ID3577

به فارسي و انگليسي : قابل رؤيت در نسخه ديجيتال

Abstract Soils landforms and lacustrine sediments in arid regions preserve paleoenvironmentalsignatures and therefore they are good indicators of environmental factors responsiblefor landscape evolution in these regions Study area is located in eastern part of Isfahan Despite the importance of Isfahan as agricultural and industrial center of Iran only a fewstudies have been carried out on paleoenvironmental changes in the study area Theobjectives of this research were to identify major landform prepare the map ofgeomorphic surfaces study the soil formation on landforms and reconstruct the pastenvironmental and climatic conditions Major landforms and geomorphic surfaces wereidentified using aerial photographs satellite images and field survey Eleven soil profileson landforms and geomorphic surfaces and eight sections on old landscape were studied Results show that tectonic has played a major role in evolution of alluvial fangenerations In contrast climatic changes with great influence on vegetation and streamshave affected the evolution of surfaces on younger generation of fans Pedological studyindicates that buried and relict paleosols have developed on Qf1 and Qf2 geomorphicsurfaces but Qf3 lacks pedogenic development Carbonate morphology was used asrelative age proxy The distribution of salinity and gypsum content was stronglyinfluenced by geomorphic position and landform hydrology Carbon isotopes inpedogenic carbonates indicate that C4 plants were dominant during carbonate formation High density C4 dominated grassland appears to have caused landscape stability and soilformation Paleotemperature determination based on oxygen isotope in calcretes showsthat carbonate formation occurred in cooler condition than today Clay mineralogyanalysis indicates that petrocalcic horizons have more smectite than palygorskite incomparison with calcic horizon This correlates well with isotopic data Also Argillichorizons on Qf1 and Qf2 geomorphic surfaces have a lot of smectite and palygorskite respectively This can be an indication of higher weathering rate as well as the older ageof Qf1 geomorphic surface Stratigraphy study shows paleoenvironmental changes in thestudy area from a lacustrine to fluvial pedogenic and eolian environment

حسين خادمي، حميد رضا كريم زاده

مصطفي كريميان اقبال

شمس الله ايوبي، سعيد اسلاميان