Geomorphic changes upstream of beaver dams in Bridge Creek, an incised stream channel in the interior Columbia River basin, eastern Oregon
Biogeography ; Channel geometry ; Dam ; Habitat ; Oregon ; Riparian vegetation ; Rodent ; Semi-arid area ; Stream ; United States of America
The AA. examined the extent of localized aggradation behind beaver dams on an incised stream in the interior Columbia River basin to assess the potential for using beaver, Castor canadensis, dams to restore such channels, and the effect
of the aggradation on riparian habitat. They compared the area surrounding reaches upstream of beaver dams that were within 0.5 m elevation of the stream channel with adjacent reaches where no dams existed. The results suggest that restoration strategies
that encourage the recolonization of streams by beaver can rapidly expand riparian habitat along incised streams.
California ; Channel geometry ; Habitat ; Riparian vegetation ; Stream ; United States of America ; Vegetation ; Wood
The AA. surveyed 20 stream reaches in Northern California with riparian corridors dominated by broadleaved trees and found that a high proportion of wood jams had key pieces that were still living. Living wood was capable of serving as a key piece
for a wood jam at a smaller size than dead wood and had a greater influence on channel morphology. Due to living wood, the range of tree species and sizes that provide stable and functional in-stream large wood may be broader than previously described.
Characterizing the variability of wood in streams : simulation modelling compared with multiple-reach surveys
Ecosystem ; Forest ; Methodology ; Model ; New Zealand ; North Island ; Numerical model ; Riparian vegetation ; Simulation ; Stream
survey data, and the second method uses numerical models based on the Monte Carlo technique. The volume frequency distributions produced by the 2 methods are compared and their value in describing wood abundance in streams is discussed as well
as the implications for management of wood in streams.
Factors influencing retention of coarse particulate organic matter in streams
Channel geometry ; Land use ; Litter ; New Zealand ; North Island ; Riparian vegetation ; Stream ; Vegetation
Input of terrestrial coarse particulate organic matter (CPOM : leaves and small wood,>1 mm) adds food resources and habitat to streams. The AA. investigated retention characteristics under base-flow conditions in 65 stream reaches in pasture, native
The AA. evaluated the contribution of dead wood to the total carbon flux in 2 headwaters forested streams in northern Spain, one running under mature deciduous forest, the other under eucalyptus plantations. Breakdown rates were measured from
branches and compared with the breakdown loss of leaf litter calculated for the same reaches. So, fine dead wood contributes to a significant fraction of the total breakdown of allochtonous organic matter in the studied streams; other sizes of dead wood
Forest age, wood and nutrient dynamics in headwater streams of the Hubbard Brook Experimental Forest, NH
Dam ; Ecosystem ; Forest ; Geochemistry ; Nitrate ; Nutrient ; Phosphate ; Riparian vegetation ; Stream ; United States of America ; Watershed
Forest (HBEF). Nutrient enrichment releases in summer 1998 were used to measure the uptake velocities of phosphate, nitrate and ammonium for 5 streams within HBEF. The AA. attribute the positive relationship between phosphate uptake velocity and forest