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Forest harvest effects on temperature of small headwater streams with and without riparian buffers Steven M. Wondzell, Jack E. Janisch, William J. Ehinger,

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Presentation on theme: "Forest harvest effects on temperature of small headwater streams with and without riparian buffers Steven M. Wondzell, Jack E. Janisch, William J. Ehinger,"— Presentation transcript:

1 Forest harvest effects on temperature of small headwater streams with and without riparian buffers Steven M. Wondzell, Jack E. Janisch, William J. Ehinger, and Peter A. Bisson With help from: Alex Foster, Shannon Claeson, and Jeff Rickleffs Janisch, J. E., Wondzell, S. M., and Ehinger, W. J Headwater stream temperature: Interpreting response after logging, with and without riparian buffers, Washington, USA. Forest Ecology and Management 270:

2 Capitol Forest Willapa Hills GOOGLEEARTHGOOGLEEARTH

3 Area: ha Winter Q: ; x = 2.1 l/s Summer Q: ; x = 0.3 l/s

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12 Temperature sensors at each wier

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14 So…… for tiny headwater streams? Does forest harvest increase stream temperature? Do riparian buffers limit temperature increases?

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16 T predicted = *T control *sin(2πj/365) *cos(2πj/365) + є r 2 =

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21 Capitol Forest Willapa Hills WILLAPA HILLS ELFL Control Continuous Clearcut LORI Control Continuous Patch Clearcut MCCO Control Continuous Patch SPLT Control Continuous Clearcut CAPITOL FOREST MOSH Control Continuous Patch ROTT Control Continuous Clearcut SESA Control Continuous Clearcut TAGS Control Continuous Patch Clearcut

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23 Descriptive variables Elevation Area Aspect Gradient Depth Canopy+Topographic density Wetted channel Wetland area Streambed texture No direct measurement of Shade

24 Descriptive variables Elevation Area Aspect Gradient Depth Canopy+Topographic density Wetted channel Wetland area Streambed texture ?

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26 Some treated streams were significantly warmer, but… On average, temperature increases were small Trend did not match expectations for treatments, Responses within treatments were highly variable Temperature responses were correlated with streambed texture, wetlands, and length of stream Surface area exposure Amount of hyporheic exchange Results Summary:

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28 So…… for tiny headwater streams? Does forest harvest increase stream temperature? Do riparian buffers limit temperature increases?

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30 WS FLOOD


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