USDA Forest Service
 

Pacific Northwest Research Station

 
 
 
Pacific Northwest Research Station
333 SW First Avenue
Portland, OR 97204

(503) 808-2100

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Land and Ecosystem Management

 

Density Management and Riparian Buffer Study: Microclimate and Microsite Component

Initial Installation Years: 1996-2001

Primary Objectives: Describe the spatial and temporal variability in microclimate, light, understory vegetation, and forest floor conditions in riparian and adjacent upland forests. Evaluate the influences of alternative overstory thinning regimes and riparian buffer widths on microclimate and microsite. Determine potential linkages between microclimate and microsite attributes with diversity and abundance of aquatic dependent vertebrates.

Pretreatment Conditions: 50- to 90-year-old stands.

Locations: Bottom Line (43.7722°N, 123.2364°W), Callahan Creek (43.8347°N, 123.5906°W), Delph Creek (45.2656°N, 122.1592°W), Green Peak (44.3667°N, 123.4583°W), Keel Mountain (44.5281°N, 122.6319°W), North Soup (43.5658°N, 123.7772°W), OM Hubbard (43.2916°N, 123.5833°W), and Ten High (44.2806°N, 123.5183°W).

Initial Treatments: Four buffer width treatments and one unthinned control each replicated zero-one times at eight locations.

No Overstory Removal (Control)
Unthinned. Provide baseline characteristics. Provide maximum buffer capacity for bank stability, coarse wood recruitment, and microclimate moderation; no environmental challenge. Not thinned. Riparian areas not planted. No woody debris or other initial treatments.

Light Overstory Removal
Two Site-Potential Tree Heights Buffer. Provide high buffer capacity for bank stability, coarse wood recruitment, and microclimate moderation; low environmental challenge. Overstory thinned or clearcut upslope of unthinned buffer width of ~480 ft, measured as slope distance from stream. Riparian areas not planted. No woody debris or other initial treatments.

Moderate Overstory Removal
One Site-Potential Tree Height Buffer. Provide high buffer capacity for bank stability, coarse wood recruitment, and microclimate moderation; moderate environmental challenge. Overstory thinned or clearcut upslope of unthinned buffer width of ~240 ft, measured as slope distance from stream. Riparian areas not planted. No woody debris or other initial treatments.

Heavy Overstory Removal
Variable Break Buffer. Provide moderate buffer capacity for bank stability, coarse wood recruitment, and microclimate moderation; high environmental challenge. Overstory thinned or clearcut upslope of unthinned buffer of variable width, determined by on-site streamside ecological breaks in vegetation and slope character. Minimum buffer width of 50 ft, measured as slope distance from stream. Riparian areas not planted. No woody debris or other initial treatments.
Streamside Retention Buffer. Provide moderate buffer capacity for bank stability, coarse wood recruitment, and microclimate moderation; high environmental challenge. Overstory thinned or clearcut upslope of unthinned buffer of variable width, determined by trees that directly confer both streambank stability by their rooting position next to streams and overhead shading by their crowns extending over the channel. Buffer width generally defined by trees within 20 ft of the channel. Riparian areas not planted. No woody debris or other initial treatments.

Response Variables: Over-, mid-, and understory vegetation; canopy cover; diffuse and direct light; air temperature; soil temperature; relative humidity; snags; down wood; forest floor; amphibians.

Contacts:
Paul Anderson, Principal Investigator, USDA Forest Service, Pacific Northwest Research Station, Corvallis, Oregon
Tel: 541.758.7786 Email: pdanderson@fs.fed.us
John Cissel, Science Liaison, USDI Bureau of Land Management, Eugene, Oregon
Tel: 541.683.6410 Email: john_cissel@blm.gov

 

 

 

 

 

 


pnw > about us > programs & teams > LWM > Landscape and Ecosystem Management

 

US Forest Service - Pacific Northwest Research Station
Last Modified: Monday,16December2013 at14:18:38CST


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