Microbial activity in parafluvial stream sediments before and after monsoonal flow, Upper San Pedro River, Southeastern Arizona
| dc.contributor.advisor | Meixner, Tom | en |
| dc.contributor.author | Krezelok, Jamie Marie | |
| dc.creator | Krezelok, Jamie Marie | en |
| dc.date.accessioned | 2018-02-28T19:10:25Z | |
| dc.date.available | 2018-02-28T19:10:25Z | |
| dc.date.issued | 2007 | |
| dc.identifier.uri | http://hdl.handle.net/10150/626913 | |
| dc.description.abstract | This study examines the effects of nutrient inputs on the microbial activity in stream sediments along the San Pedro River during the 2003 monsoon season. Surface water from three flow events, as well as pore water from below a point bar were monitored for dissolved constituents. As a proxy for microbial respiraton rate, gas fluxes were measured. Immediately after the floods, in situ respiration rates increased above and below the water table. Methane, N20 and CO2 flux measurements more than tripled, signifying an increase in anaerobic respiration. During flow events dissolved levels of DOC, DON, nitrite, and nitrate measured in the stream and pore water all increased, while sulfate, chloride and bromide all decreased. Furthermore, Cl:Br and C:N concentration ratios both changed, indicating a new source of water to the system during monsoonal flows. Flow events appear to trigger both aerobic and anaerobic processes in the sediment. | |
| dc.language.iso | en_US | en |
| dc.publisher | The University of Arizona. | en |
| dc.rights | Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. | en |
| dc.title | Microbial activity in parafluvial stream sediments before and after monsoonal flow, Upper San Pedro River, Southeastern Arizona | en_US |
| dc.type | text | en |
| dc.type | Thesis-Reproduction (electronic) | en |
| thesis.degree.grantor | University of Arizona | en |
| thesis.degree.level | masters | en |
| dc.contributor.committeemember | Meixner, Tom | en |
| thesis.degree.discipline | Graduate College | en |
| thesis.degree.discipline | Hydrology and Water Resources | en |
| thesis.degree.name | M.S. | en |
| dc.description.note | Digitized from paper copies provided by the Department of Hydrology & Atmospheric Sciences. | en |
| refterms.dateFOA | 2018-08-13T20:51:37Z | |
| html.description.abstract | This study examines the effects of nutrient inputs on the microbial activity in stream sediments along the San Pedro River during the 2003 monsoon season. Surface water from three flow events, as well as pore water from below a point bar were monitored for dissolved constituents. As a proxy for microbial respiraton rate, gas fluxes were measured. Immediately after the floods, in situ respiration rates increased above and below the water table. Methane, N20 and CO2 flux measurements more than tripled, signifying an increase in anaerobic respiration. During flow events dissolved levels of DOC, DON, nitrite, and nitrate measured in the stream and pore water all increased, while sulfate, chloride and bromide all decreased. Furthermore, Cl:Br and C:N concentration ratios both changed, indicating a new source of water to the system during monsoonal flows. Flow events appear to trigger both aerobic and anaerobic processes in the sediment. |
