An Interregional Comparison of Channel Structure, Transient Storage and Riparian Canopy With Metabolism in Streams Draining Watersheds in Different Successional Stages.

HR: 1330h
AN: NB33L-03 [Abstracts]
TI: An Interregional Comparison of Channel Structure, Transient Storage and Riparian Canopy With Metabolism in Streams Draining Watersheds in Different Successional Stages.
AU: * Hill, B H
EM: hill.brian@epa.gov
AF: US Environmental Protection Agency, Mid-Continent Ecology Division, Duluth, MN 55804 United States
AU: McCormick, F H
EM: fmccormick@fs.fed.us
AF: US Forest Service, Olympia Forestry Sciences Laboratory, Olympia, WA 98512 United States
AU: Harvey, B C
EM: bch3@jumboldt.edu
AF: US Forest Service, Redwood Sciences Laboratory, Arcata, CA 95521 United States
AU: Johnson, S L
EM: johnsons@fsl.orst.edu
AF: US Forest Service, Pacific Nortwest Research Laboratory, Corvallis, OR 97331 United States
AU: Warren, M L
EM: fswarren@olemiss.edu
AF: US Forest Service, Center for Bottomland Hardwoods Research, Oxford, MS 38655 United States
AB: We related channel structure, transient storage and riparian canopy with net daily metabolism (NDM) in 32 first- through fourth-order streams in the southeastern and northwestern United States. Management histories of the watersheds resulted in a variety of forest successional stages. Channel structure and riparian canopy estimates were collected at 10 points along each 40-100m study reach. Transient storage was calculated as differences in areas under the curves for predicted and actual Cl^{- transport through the study reaches. NDM was estimated from single-station oxygen changes using the surface renewal
model. Channel slope was significantly related to NDM in both the northwestern and southeastern streams, and we classified
streams into high (>3%) and low gradient groups. NDM ranged from -150 mg O₂ m^-2 d^-1 in the early
successional, high gradient streams to -1590 mg O₂ m^-2 d^-1 in the mid-successional, low gradient streams. NDM
in the high gradient streams was significantly correlated with percent of the stream having fast moving water (r=-0.53),
transient storage (r=0.38), riparian canopy (r=-0.36) and percent coarse substrates (r=0.29). NDM in the low gradient streams was significantly correlated with stream velocity (r=-0.39) and percent coarse substrates (r=0.32).} DE: 0400 Biogeosciences
DE: 1871 Surface water quality
DE: 4845 Nutrients and nutrient cycling
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly