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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | Headwater stream temperature: Interpreting response after logging, with and without riparian buffers, Washington, USA. Article in Forest Ecology and Management, 270, 302-313. |
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Headwater stream temperature: Interpreting response after logging, with and without riparian buffers, Washington, USA. Article in Forest Ecology and Management, 270, 302-313. (Number of pages: 27) (Publication Size: 149KB)
Note: This pdf is a pre-print, not a final draft with figures or tables.
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| Author(s) | Janisch, J.E., S. M. Wondzell, and W. J. Ehinger | ||||
| Description | This article was published in the journal, Forest Ecology and Management, 270, 302-313. The article is co-authored by Washington State Department of Ecology staff and U.S. Forest Service staff. Distribution of the final version of this article is limited due to journal copyright. During approximately the past 50 years, stream temperature response to logging practices has been frequently studied. These studies have suggested that the amount of shade from stream-adjacent forest, as well as other variables such as elevation and aspect, can influence stream temperature when the streamside forest is removed by logging or otherwise disturbed. Results from these studies, however, have been variable, and the magnitude of stream temperature response has not always been predictable by the amount of stream-adjacent forest removed. Recent thought and research on this topic has thus tended to consider why, given similar logging treatments, some streams increase greatly in temperature after logging whereas temperatures of others increase only slightly, and why occasionally temperatures of yet other streams after logging have appeared to decline. Hyporheic flow and streambed sediment texture have been proposed as possible explanations. Recently, we observed that the temperature response of small forested headwater streams to logging were also highly variable. We further observed, however, that the degree of stream temperature response in the streams studied was strongly correlated with two landscape variables: cumulative surface area of small, stream-adjacent wetlands (0.93) and length of flowing surface water above our stream temperature monitoring stations (0.65). Additionally, stream sediment texture appeared important, with streams having coarse substrates being thermally unresponsive and streams having fine substrates being thermally responsive. Conversely, our measure of stream shade was not a strong predictor of stream thermal response. These results suggest that very small headwater streams may be fundamentally different than many larger streams because factors other than shade from the overstory tree canopy can have sufficient influence on stream energy budgets to strongly moderate stream temperatures even following complete removal of the overstory canopy. This raises the possibility that there are several types of very small headwater streams, some being thermally responsive and some not. Such a finding is potentially of importance to several fields of natural resource management. Confirming our observations, however, will take substantial additional work. |
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The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.
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| Contact | EAP Publications Coordinator at 564-669-3028 or EAPpubs@ecy.wa.gov | ||||
| WEB PAGE | Forest Ecology and Management | ||||
| RELATED PUBLICATIONS | Title:
Characteristics of small headwater wetlands in second-growth forests of Washington, USA. Article in the journal, Forest Ecology and Management. |
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