30 



CIRCULAR 791, U. S. DEPARTMENT OF AGRICULTURE 



Table ^.—Yields per acre for fully stocked stands of black spruce in 

 northeastern Minnesota {12) 



Good Site 



Age of 

 main 

 stand 



Dominant trees 



Trees 

 over 0.5 



inch 

 d. b. h. 



Basal 

 area of 



trees 

 over 0.5 



inch 

 d. b. h. 



Volume, 1 

 trees over — 



Mean annual 



growth, 

 trees over — 



(years) 



Average 

 height 



A verage 

 d. b. h. 



3.5 



inches 

 d. b. h. 



5.5 



inches 

 d.b.h. 2 



3.5 



inches 

 d. b. h. 



5.5 



inches 

 d. b. h.2 



20 



Feet 

 17 

 26 

 33 

 39 

 44 

 49 

 52 

 58 

 62 

 65 

 67 

 69 



Inches 

 2.2 

 3. 4 

 4.2 

 4.9 

 5. 5 

 6.0 

 6.3 

 6.9 

 7.3 

 7.6 

 7.8 

 8.0 



Number 



5,741 



3,478 



2,529 



1,957 



1,520 



1,277 



1, 157 



959 



849 



775 



748 



688 



Square 

 feet 

 84 

 129 

 149 

 159 

 162 

 153 

 164 

 166 

 168 

 169 

 170 

 170 



Cords 



Cords 



Cords 



Cords 



30 



40 



50 



60 



8 

 17 

 26 

 32 

 37 

 41 

 47 

 52 

 54 

 56 

 57 







4 

 12 

 20 

 28 

 34 

 42 

 48 

 51 

 53 

 54 



0.27 

 .42 

 , .52 

 .53 

 .53 

 . 51 

 .47 

 .43 

 .39 

 .35 

 .32 



""6.16 



.24 



33 



70 ■ 



80 



100 



120 



140 



160 



180 



. 40 

 . 42 

 .42 

 .40 

 .36 

 .33 

 .30 









Medium Site 











20 



14 

 22 



28 



1.4 



2.4 

 3.2 















30 _ _- 



5,310 

 3,675 



91 

 123 



1 



6 





0.03 

 . 15 





40 





50 



33 

 37 



41 

 44 



3. 9 



4. 5 

 4.9 



5.2 



2,916 

 2, 350 

 1,957 

 1, 714 



142 

 155 

 159 

 161 



14 

 22 



27 

 31 



2 



7 



12 

 17 



.28 

 .37 

 .39 

 .39 



0. 04 



60 



. 12 



70 



. 17 



80 



.21 



100 



48 



5.7 



1,422 



162 



36 



25 



.36 



. 25 



120 



52 



6.0 



1,277 



163 



40 



30 



.33 



.25 



140 



54 



6.3 



1, 157 



164 



43 



35 



.31 



.25 



160 



56 



6. 5 



1,086 



166 



45 



38 



.28 



.24 



180 



57 



6.7 



1,022 



167 



47 



41 



.26 



.23 



Poor Site 



20 _ 



11 

 17 

 22 

 26 

 29 

 32 

 34 

 38 

 41 

 43 

 44 

 45 



0. 8 

 1.6 

 2.3 

 2.9 

 3.3 

 3.7 

 4. 1 

 4.5 

 4.8 

 5.0 

 5.2 

 5.3 















30 















40 



5,502 

 4,338 

 3,575 

 3,077 

 2,691 

 2,275 

 1,985 

 1,837 

 1,714 

 1,626 



86 

 110 

 123 

 136 

 146 

 155 

 158 

 160 

 161 

 161 











50 



60 



70 



80 



100 



120 



140 



160 



180 



3 

 6 

 12 

 16 

 24 

 27 

 30 

 31 

 32 



1 

 4 

 8 

 11 

 15 

 17 

 18 



0. 06 

 . 10 

 . 17 

 .20 

 .24 

 .22 

 . 21 

 . 19 

 . 18 



0.01 

 .05 

 .08 

 .09 

 . 11 

 . 11 

 . 10 



1 Unpeeled merchantable volume in standard cords from a 1-foot stump to a 

 3-inch top d. i. b. 



2 Volumes of trees over 5.5 inches d. b. h. compiled at Lake States Forest Expt. 

 Sta. by means of stand structure data shown in table 12, Appendix. 



