RESULTS 



Results of thinnings in the moderately overstocked West Fork stand and the heavily over- 

 stocked Pattee Canyon stand are presented in tables 1 and 2. These two studies provide 10-year 

 results of "crop-tree" thinning (West Fork) and 27-year results of uniform thinning (Pattee 

 Canyon). Plot means on West Fork do not readily show relative growth responses because of 

 initial inequalities in average d.b.h. However, individual tree analysis shows significant dif- 

 ferences that are masked in the stand means. Growth response to thinning is obvious in the 

 Pattee Canyon plots and is proportionate to the degree of stocking (table 2). 



Table 1. 



-- Total per-acre stocking in West Fork before thinning in 1949 and crop-tree stocking 

 per acre after thinnings in 1949 and 1959 



Treatment 

 and 

 plot number 



Before thinning 

 (all trees) 



After thinning 

 (crop trees only) 







. Mean : _ : Basal 



• , , Trees 



. d.b.h. : : area 



Mean d.b.h. :Mean total height: Trees : 



Basal area 



Volume ^ 



1949 : 1959 : 1949 : 1959 : 1949 : 1959 : 



1949 : 1959 



1949 : 1959 



Inches Number Sq. ft. 



■ Inches - - 



Feet - 



-Number ■ 



- Sq. ft.- 



-Cu. ft. 



D+4 



(1) 



3.4 



1 



586 



103 



5.3 



7.0 



44 



55 



198 



188 



34 



50 



610 



1.077 



D+4 



(2) 



3.8 



1 



386 



111 



5.6 



6.7 



50 



60 



188 



176 



33 



43 



664 



963 



Crown 



(3) 



3.9 



1 



410 



118 



5.8 



6.8 



48 



59 



168 



168 



32 



42 



656 



945 



Crown 



(4) 



3.2 



1 



886 



106 



5.7 



7.0 



47 



56 



174 



172 



34 



46 



665 



1,026 



Unthinned 



(5) 



3.9 



1 



668 



135 



6.0 



7.1 



52 



62 



164 



164 



36 



45 



753 



1,069 



Cubic-foot volume on crop trees 2.4 inches d.b.h. and larger, peeled volume, including stump, stem, and top. 



Table 2. 



- Total per-acre stocking in Pattee Canyon before thinning in 1932 and after thinning 



in 1932 and 1960 



Treatment 

 and 

 plot number 



Before thinning 

 (all trees) 



Mean : ^ : Basal • , , 



, , Trees Volume " 



d.b.h. : : area : 



After thinning 

 (all trees) 



Mean d.b.h. :Mean total height : 



Trees 



Basal area 



1932 : I960: 1949= : 1960 



1932 



1960 



1932 : 1? 



Volume 



1932 



1960 



Inches Number Sq.ft. Cu.ft. 



- Inches - - - - Feet 



Number- - 



Sq. ft. 



Cu. ft. 



Thinned (1) 



(=) 



2,468 



(3) 



878 



3.3 



5.1 



42 



50 



876 



824 



57 



132 



660 



2,666 



Unthinned (2) 



2.1 



3,020 



95 



971 



2.1 



3.8 



37 



42 



3,020 



1,660 



95 



153 



971 



2,596 



Unthinned (3) 



i.4 



7,500 



102 



742 



1.4 



2.6 



31 



37 



7,500 



3,050 



102 



140 



742 



1,894 



Includes all trees 0.6 inch d.b.h. and over, peeled volume, including stump, stem, and top. 

 The unthinned plots were not measured until 1949. 

 Data not available. 



3 



