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You searched for subject:(Stratified mineral sediments). One record found.

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University of Saskatchewan

1. Wang, Xiaoyue 1986-. Charaterizing soil properties and biogeochemical processes in a mountain peatland.

Degree: 2016, University of Saskatchewan

Northern peatlands are important to the global carbon (C) and nitrogen (N) cycles. Peat profiles in Rocky Mountain areas commonly show complex stratigraphy with underlying and/or interbedded mineral sediments, referred to as stratified mineral horizons. Stratified mineral horizons usually have lower hydraulic conductivity and more electron acceptors, which influences biogeochemical processes. To study the effect of mineral sediments on pedological and biogeochemical processes, I conducted a field study and a microcosm study. The field study was located in a mountain peatland in the foothills of the Canadian Rocky Mountains with three different organic soil types: sedge peat/silty sediments/calcareous sediments (PMC), sedge peat/silty sediments/moss peat (PMP) and sedge peat/moss peat (PP). Soil samples were tested for spatial distribution of total organic C (TOC), total N (TN), pH, volumetric water content (θv), C and N cycling rates, C composition and microbial community structure. A microcosm study was designed to mimic climate warming conditions with four temperature-water table treatments: current temperature/current water table, higher temperature/current water table, current temperature/lower water table, and higher temperature/lower water table. In the microcosm study, PMC and PP soils were incubated for 28 days and tested for GHG emissions and concentrations, biogeochemical process rates, apparent enzyme activation energy (Ea) and bacterial community structure. In the field study, results indicated mineral sediments mainly affect pedological and biogeochemical processes in subsurface peat rather than surface peat. Mineral sediments affected the spatial distributions of total organic C (TOC), total N (TN), pH and volumetric water content (θv) via elevating the pH adjacent to calcareous sediments and slowing water infiltration to lower depths. The pH and θv further affected TOC and TN distribution by regulating organic matter decomposition during the peatland’s geomorphic history. At the same time, mineral sediments also affected C and N cycling processes, though depth had an even greater effect. The effect of mineral sediments on N cycling was mainly due to high pH from calcareous sediments, which promoted net nitrification but lowered net ammonification in the PMC. Moreover, mineral sediment mitigated the lag phase of N cycling in deeper layers. The effect of mineral sediments on C cycling was reflected in two aspects, geomorphic history and hydrological conditions. During the peatland’s geomorphic history, mineral horizons promoted decomposition by increasing pH and providing electron acceptors in overlying peat. Enhanced decomposition in the past resulted in more recalcitrant materials in peat at present. This, combined with physicochemical protection of C by mineral sediments, further restricted C mineralization in the PMP and PMC. Hydrologically, stratified mineral horizons slowed water infiltration and resulted in higher θv above the mineral horizon and lower θv below the mineral horizon. This restricted… Advisors/Committee Members: Bedard-Haughn, Angela, Siciliano, Steven, Helgason, Bobbi, Farrell, Rich, Westbrook, Cherie.

Subjects/Keywords: Peatland; Stratified mineral sediments; Spatial distribution of soil properties; Carbon and nitrogen cycling; Microbial community structures; Greenhouse gases emission

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APA (6th Edition):

Wang, X. 1. (2016). Charaterizing soil properties and biogeochemical processes in a mountain peatland. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7433

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Wang, Xiaoyue 1986-. “Charaterizing soil properties and biogeochemical processes in a mountain peatland.” 2016. Thesis, University of Saskatchewan. Accessed January 19, 2020. http://hdl.handle.net/10388/7433.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Wang, Xiaoyue 1986-. “Charaterizing soil properties and biogeochemical processes in a mountain peatland.” 2016. Web. 19 Jan 2020.

Vancouver:

Wang X1. Charaterizing soil properties and biogeochemical processes in a mountain peatland. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2020 Jan 19]. Available from: http://hdl.handle.net/10388/7433.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang X1. Charaterizing soil properties and biogeochemical processes in a mountain peatland. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/7433

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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