Characteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in Interior Alaskan peatlands

dc.contributor.advisorTuretsky, Merritt
dc.contributor.authorZwanenburg, Natalie
dc.date.accessioned2018-04-10T20:12:38Z
dc.date.available2018-04-10T20:12:38Z
dc.date.copyright2018-04
dc.date.created2018-03-20
dc.date.issued2018-04-10
dc.degree.departmentDepartment of Integrative Biologyen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.degree.programmeIntegrative Biologyen_US
dc.description.abstractThis thesis addresses two uncertainties concerning permafrost thaw in peatlands by quantifying: (i) how soil characteristics and collapse-scar feature morphology interact to influence lateral expansion rates of thermokarst features; and (ii) the consequences of thermokarst expansion rates on terrestrial carbon storage. I collected peat cores within and adjacent to collapse-scar features to develop a chronosequence of time-following-thaw. I explored feature morphology and soil characteristics using grain size analysis. Radiocarbon dating of the organic and mineral soils from each peat core was used to quantify lateral expansion and peat accumulation rates. Grain size was uniform across the study region, suggesting other physical characteristics (such as ice content and organic matter) influence thaw rate of collapse-scar features. Permafrost carbon stocks rapidly decrease post-thaw, while new surface peat carbon gradually accumulates. My findings suggest anywhere from 250-700 years of surface peat accumulation is required to compensate for deep permafrost carbon losses.en_US
dc.description.sponsorshipNorthern Scientific Training Program
dc.identifier.urihttp://hdl.handle.net/10214/12603
dc.language.isoenen_US
dc.publisherUniversity of Guelphen_US
dc.rightsAttribution-NonCommercial-NoDerivs 2.5 Canada*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/ca/*
dc.subjectThermokarsten_US
dc.subjectPermafrosten_US
dc.subjectTerrestrial Carbon Storageen_US
dc.subjectLateral Expansion Ratesen_US
dc.subjectCollapse-Scar Featuresen_US
dc.subjectGrainsizeen_US
dc.titleCharacteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in Interior Alaskan peatlandsen_US
dc.typeThesisen_US

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