CONTENTS 



Page 



INTRODUCTION 1 



UPPER WEST BRANCH STUDY 2 



Establishment 2 



30-Year Results 3 



UPPER SANDS CREEK STUDY 6 



Establishment 6 



Results 6 



LOWER SANDS CREEK STUDY 8 



Establishment 8 



Results , , 8 



DISCUSSION 12 



LITERATURE CITED 14 



ABSTRACT 



Effects of release by removal of a residual overstory and by 

 cleaning treatments were measured over a 30-year period in young 

 mixed-conifer stands on moist sites in northern Idaho. Increasing 

 time of overwood retention caused rapid loss of the more intolerant 

 species and corresponding reduction in subsequent alternatives for 

 crop-tree selections. Cleaning effectively promoted the growth of 

 leave trees (principally western white pine), but the amount and 

 duration of benefit was decreased by an aggressive reappearance of 

 tolerant and intolerant species, especially in heavily cleaned plots. 



