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.
Impacts of river restoration on small-wood dynamics in a low-gradient headwater stream
Wood in world rivers. Special issue
Based on tracing dowels to simulate small wood in 3 study reaches before and after restoration, this study provides a detailed representation of the influence of restoration on small-wood transport and the relative importance of different trapping
Characterizing the variability of wood in streams : simulation modelling compared with multiple-reach surveys
Wood in world rivers. Special issue
The AA. present 2 independent but complementary methods to develop frequency-volume distributions for wood in 200 m and 400 m reaches on tributaries of the Waihaha River, New Zealand. The first method uses a sliding window analysis of extensive wood
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.
Contribution of dead wood to the carbon flux in forested streams
Wood in world rivers. Special issue
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
increase the breakdown by an order of magnitude, and thus can result in a large part of the carbon flux being derived from wood.
Forest age, wood and nutrient dynamics in headwater streams of the Hubbard Brook Experimental Forest, NH
Wood in world rivers. Special issue
This study tested how instream uptake of nitrate and phosphate were affected by successional differences in the accumulation of large wood and debris dams in a 66-year chronosequence formed by 5 watersheds within the Hubbard Brook Experimental
age/large wood volume to increased abiotic adsorption of phosphate by the inorganic sediments retained by wood.
Geomorphic and riparian forest influences on characteristics of large wood and large-wood jams in old-growth and second-growth forests in Northern Michigan, USA
Wood in world rivers. Special issue
The AA. studied relationships between geomorphic and riparian factors and large wood (LW) and large-wood jams (LWJ) structure in different geomorphic settings associated with old-growth and second-growth settings in the Porcupine Mountains along
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
-energy slope erosion (hillwash). Natural or anthropogenic factors could have been the triggers of the erosional processes derived. Determinations of charcoal and fossil wood revealed the Holocene occurrence of tree species (spruce, juniper) for areas
Dans les pays pauvres, les résultats de l'application des outils de la gouvernance mondiale (institutions de Bretton Woods et OMC) qui ont donné les modèles inspirés de W.W. Rostow et du consensus de Washington, sont contrastés. Les politiques