which encourage int-.ensive management, bat r.ome of the practices 

 involved may not be consistant with management objectives. There are 

 basically two scenarios for prescriptions for SMZs. They are: 



1) Even-aged management 



Small clearcuts (generally less than 10 acres) are 

 considered an appropriate method to manage SMZs if certain 

 conditions are met. The total length of stream e:<posed to 

 increased solar radiation must be kept at a level below which 

 adverse temperature increases will occur. Equipment operation 

 "and directional falling restrictions must be applied. 

 Slash disposal may require some hand work. 



a) Where risk of wind-throw is moderate to high, removal 

 of all full crowned, old growth trees may be 

 necessary. Numerous tipped over trees in the SM2 may 

 result in an increase in sediment and debris. 



b) Under an even-aged prescription, units in the SMZ 

 should: 



- have continuous openings along streams not 

 exceeding 600 ft. in length; 



- have cover areas between openings at least 400 ft. 

 wide ; 



- have openings at any point in time not to exceed 

 20% of each stream length; 



- not have openings resulting from timber harvest 

 opposite each other on both sides of a stream. 



2) Uneven-aged management 



Uneven-management within an SMZ is usually accomplished 

 through single tree selection with directional falling and 

 equipment operating restrictions. The stands created or main- 

 tained include three or more distinctly different age classes. 

 This prescription for SMZs may be appropriate where: 



a) Stream channel banks eure unstable and clearcuts would 

 cause an erosion hazard. 



b) Maintenance of conifer shade cover is essential. 



c) Regeneration of serai species is not intended. 



d) Low blowdown potential of the tree species in the 



unit. 



e) Good access exists for regular entries. 



f) Slash treatment is not a problem. Tree length 

 skidding may be necessary. Harvest species and tree 

 lieights will help determine feasibility. 



