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Why can clear-cutting temporarily affect stream temperature and sediment levels?

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Logging in Borneo — forestry Trucks on a road transporting recently harvested logs near Sabah's border with Kalimantan in Borneo.

Clear-cutting can temporarily degrade stream quality by increasing both water temperature and sediment levels, primarily due to the removal of the protective forest canopy and root systems.1

Impact on Stream Temperature

Forest canopies provide shade that keeps streams cool. When trees are removed, the loss of this cover exposes the water to direct sunlight, which can lead to significant increases in stream temperature.1

Impact on Sediment Levels

The removal of trees and understory plants eliminates the vegetation that normally holds soil in place and filters runoff. This leads to several issues:12
* Increased Erosion: Without roots to stabilize the ground, soil is easily washed away during precipitation, particularly on steep slopes.2
* Logging Infrastructure: The construction of roads for heavy logging equipment often serves as a major source of sediment, as these disturbed areas are prone to erosion.12
* Turbidity: This influx of soil particles, or suspended solids, increases the turbidity of the water, which can negatively affect aquatic ecosystems.1

While these disturbances are often temporary, they highlight the importance of maintaining forest cover to protect watershed health and water quality.1