Abstract
dc:description.abstractI released chloride and corn pollen into artificial streams to study the effects of discharge, substrate size, leaf packs, and pools on the retention and transport of fine particulate organic matter (FPOM). I found that doubling discharge significantly decreased both hydraulic and FPOM retention (measured as pollen uptake length). However, quadrupling discharge returned both hydraulic and FPOM retention to original or higher values. There was a strong positive relationship between FPOM depositional velocity and discharge (r² = 0.846, p < 0.0001), and between FPOM depositional velocity and turbulence (r² = 0.831, p < 0.0001). Depositional velocity for all experiments was considerably less than predicted by the “fall-velocity model”. Substrate size controlled hydraulic retention through the size of interstitial spaces in the bed and FPOM retention through substrate-created turbulence. Small gravel substrate had the largest transient storage zone relative to stream cross-sectional area. Large gravel substrate had the highest depositional velocity of pollen and the most turbulence. Cobble had the least hydraulic and FPOM retention. Adding leaf packs significantly decreased hydraulic and FPOM retention. However, the number of leaf packs made little difference. Adding pools significantly increased hydraulic retention and FROM depositional velocity.
Degree
thesis:*- Name thesis:degree_name
- Master of Science
- Level thesis:degree_level
- masters
- Discipline thesis:degree_discipline
- Biology
- Department dc:contributor.department
- Biology
- Grantor dc:publisher
- Virginia Tech
- Year dc:date.issued
- 1996
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Ward, Brian Richard
- Chair dc:contributor.committeechair
-
- Webster, Jackson R.
- Committee members dc:contributor.committeemember
-
- Benfield, Fred
- Dolloff, C. Andrew
Subjects
dc:subject × 6Rights
dc:rights- Statement dc:rights
-
- In Copyright
- Licence dc:rights.uri
- Language dc:language.iso
- en
Identifiers
dc:identifier.*- Dc Identifier Other
- etd-08292008-063255
- OAI identifier oai:identifier
- oai:vtechworks.lib.vt.edu:10919/44482