Skip navigation
Please use this identifier to cite or link to this item:
Title: Physical-Chemical Dynamics of Dissolved Gases in Wetland Soils: Implications for the Water Quality and Carbon Sequestration Functions of Wetlands
Authors: Reid, Matthew Charles
Advisors: Jaffe, Peter R
Contributors: Civil and Environmental Engineering Department
Keywords: Dissolved Gases
Water and Sanitation
Water Quality
Water Resources
Wetland Biogeochemistry
Subjects: Environmental engineering
Environmental science
Issue Date: 2014
Publisher: Princeton, NJ : Princeton University
Abstract: Gas transfer phenomena are fundamental to the water quality and biogeochemical functions of wetlands. Characterizing the physical-chemical controls on wetland dissolved gas dynamics, and distinguishing those processes from the confounding influences of biochemical production and/or consumption, has been a challenge for wetland science. In this thesis I describe a set of laboratory, field, and modeling studies intended to resolve the eects of transport and gas exchange on the biogeochemistry of complex soil - plant systems. Results are discussed in the context of the water quality and carbon sequestration services provided by wetland ecosystems. Gas tracers are used in push-pull measurements in well-controlled laboratory experiments and in natural wetland environments to quantify the kinetics of root-mediated gas exchange in situ and to account for the effects of trapped gas bubbles on rate determinations. Root uptake of volatile chemicals from wetland soils is partitioned into different biophysical mechanisms, and an empirical relationship is developed to scale root-mediated gas exchange kinetics between different chemical compounds. The controls on tidal marsh methane dynamics are explored in a year-long field study, and a complementary set of observations reveals how spatially varying gas exchange pathways influence spatiotemporal patterns of subsurface methane pools and contribute to seasonal lags in emissions. In the nal chapter, I shift my focus to a separate topic linking water resources and biogeochemistry, and develop a model for quantifying methane emissions from decomposing organic matter in pit latrines. A global water table model is used to determine aerobic versus anaerobic conditions in pit latrines, and is coupled with spatial sociodemographic data to estimate global emissions and to inform a discussion of mitigation opportunities and costs.
Alternate format: The Mudd Manuscript Library retains one bound copy of each dissertation. Search for these copies in the library's main catalog
Type of Material: Academic dissertations (Ph.D.)
Language: en
Appears in Collections:Civil and Environmental Engineering

Files in This Item:
File Description SizeFormat 
Reid_princeton_0181D_10891.pdf33.05 MBAdobe PDFView/Download

Items in Dataspace are protected by copyright, with all rights reserved, unless otherwise indicated.