• Logging with ground-based equipment 

 would have low to moderate impact on 

 soil productivity from compacting and 

 displacing soils. Approximately 220 acres 

 (20%) within the treated area would 

 receive moderate to high compaction 

 resulting from ground-based skidding 

 operations, landings, and temporary skid 

 trails. 



• Hazard reduction with excavators would 

 have a moderate impact through 

 displacement on 15% of the area 

 (approximately 147 acres). 



The assumptions listed above, used to calcu- 

 late impacts to soil productivity, are based on 



the Kootenai National Forest's soil scientists' 

 personal experiences and relevant research 

 articles (Dryness, 1965; Froehlich, 1973; 

 Hatchell et al., 1970; Klock, 1975; Nielsen- 

 Gerhard t, 1986; Steinbrenner and Gessel, 

 1955). A comparison of potential direct effects 

 from management activities is displayed in 

 Table IV-6. 



Due to Unit 10 being located in a wet, low- 

 lying area, winter logging is recommended, 

 order to reduce soil disturbance, activities 

 would occur when soils within the unit are 

 frozen or covered with a deep snowpack 

 (more than 12 inches). 



In 



TABLE IV-6 - DIRECT EFFECTS ON SOIL PRODUCTIVITY BY ALTERNATIVE 



TYPE OF 

 EFFECT* 



L ROADS 



a) Acres lost to production by road construction 



0.0 



24.9 



23.5 



n. TRACTOR HARVESTING 



a) Acres affected by ground-based machinery 

 (summer only). Regeneration units. 



Total Acreage Managed by Tractor 



1. Multiply by .175 =(acres with low impact) 



2. Multiply by .10 ={acres with moderate 

 impact) 



3. Multiply by .075 =(acres with high impact) 



610 



61.0 



610 



61.0 



b) Acres affected by ground-based machinery. 

 Intermediate/thinrung units. 



1. Multiply by .035 = (acres with low impact) 



2. Multiply by .020 = (acres with moderate 

 impact) 



3. Multiply by .015 = (acres with high impact) 



0.0 



496 



9.92 



496 



9.92 



c) Acres affected by over-snow operations (winter 

 tractor - all activities) 



1. Multiply by .10 = (acres with moderate 

 impact) 



0.0 



24 



2.4 



24 



2.4 



III. HAZARD REDUCTION/SITE PREPARATION 



a) Total acreage affected by ground-based equipment 

 (dozer/excavator) 



b) Acres moderately affected by excavator /dozer 



(multiply by .15) 



0.0 



981 

 147.2 



981 



147.2 



IV. TOTALS 



a) Acres with greatly reduced site quality (sum of la, 

 Iia3, IIb3) 



b) Acres with some reduction in site quality (sum of 

 IIa2, IIb2, IIcl, Illb) 



0.0 



24.9 

 220.6 



23.5 

 220.6 



* Includes compaction and displacement 



IV-22r 



Stillwater State Forest • Beaver Lake Timber Sale Project 



