Regulating riparian forests for aquatic productivity in the Pacific Northwest, USA: addressing a paradox

Springer Science and Business Media LLC - Tập 23 - Trang 1149-1157 - 2015
Michael Newton1, George Ice2
1Department of Forest Engineering, Resources and Management, Oregon State University, Corvallis, USA
2George Ice, Forest Hydrologist, Monroe, USA

Tóm tắt

Forested riparian buffers isolate streams from the influence of harvesting operations that can lead to water temperature increases. Only forest cover between the sun and stream limits stream warming, but that cover also reduces in-stream photosynthesis, aquatic insect production, and fish productivity. Water temperature increases that occur as streams flow through canopy openings decrease rapidly downstream, in as little as 150 m. Limiting management options in riparian forests restricts maintenance and optimization of various buffer contributions to beneficial uses, including forest products, fish, and their food supply. Some riparian disturbance, especially along cold streams, appears to benefit fish productivity. Options for enhancing environmental investments in buffers should include flexibility in application of water quality standards to address the general biological needs of fish and temporary nature of clearing induced warming. Local prescriptions for optimizing riparian buffers and practices that address long-term habitat needs deserve attention. Options and incentives are needed to entice landowners to actively manage for desirable riparian forest conditions.

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