The effects of riparian forest disturbance on stream temperature,sedimentation, and morphology |
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Authors: | Jered M Studinski Kyle J Hartman Jonathan M Niles Patrick Keyser |
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Institution: | 1.Department of Forestry and Natural Resources,West Virginia University,Morgantown,USA;2.Department of Biology,Susquehanna University,Selinsgrove,USA;3.Department of Forestry, Wildlife, and Fisheries,University of Tennessee,Knoxville,USA |
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Abstract: | Forested headwater streams rely on their riparian areas for temperature regulation, woody debris inputs, and sediment retention.
These products and services may be altered by disturbances such as timber harvest, windthrow, or development. This study investigated
the effects of riparian forest disturbance by removing trees using 50 and 90% basal area harvests and by directly felling
some trees into eight streams in eastern West Virginia. On summer afternoons, water temperature increased in the 50 and 90%
BAH treatments at average rates of 0.18 and 0.79°C/100 m, respectively. The 90% BAH treatments had the potential to disrupt
fish and invertebrate communities via increased water temperature. New roads and log landings associated with the riparian
logging had no detectable effect on sedimentation or turbidity. Large woody debris (LWD) additions increased habitat complexity
but no net increase in pool area was observed. Greater morphological instability was observed within the LWD addition sections
as pools were both created and destroyed at significantly higher rates. Experimentally manipulating small riparian patches
may be an analog for small-scale natural and anthropogenic disturbances. These common events are assumed to alter streams,
but there are few experimental studies quantifying their effects. |
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