8 



BULLETIH 1m, U. S. DEPAETMEIirT OF AGRICULTURE. 



pared, it is found that the bottom sites show a greater tendency to- 

 ward favoring fungous development. The average percentage of 

 infected trees for the bottom sites by this method is 52, and for the 

 slope sites 47. On the bottom sites the rot percentage is 7.8, and on 

 the slope sites 6.1. These figures indicate that although a slightly 

 larger percentage of trees was infected (55.3) and although the trees 

 were considerably older on an average on the slope sites, the bottom 

 sites carry the larger rot percentage. Considering the various areas 

 upon which data were taken as a unit, the total volume of rot was 

 found to be 13,359 cubic feet and the total volume of the stand 

 193,432 cubic feet. This gives a rot percentage of 6.9, or 7.0 figured 

 on a basis of 1,282 sound and infected trees, ranging from the 40 

 years' growth to the veterans of 450 and more years. 



Table I. — Relation of rots to age classes in ivestern white pine on sites of the 



bottom and slope types. 



[Abbreviations: T. R.= trunk-rot: B. R.=butt-rot.] 





Age compu- 

 tations (years). 



Average volume (cubic feet). 



Number of trees 

 (basis). 





6 



50 



i 



1 



1 



1 



1 



'6 



3 



S 



"3 

 to 

 bo 



OS 



1 



1 



Rot per infected tree. 



'6 



o 

 m 



Infected. 



Age classes. 







+ 

 &5 



Annual increase 



between age 



classes. 







PQ 

 + 



t5 







« 



B 





+ 



1 



Bottom sites: 



41 to 60 years 



61 to 80 years 



81 to 100 years 



101 to 120 years... 

 121 to 160 years... 

 161 to 200 years... 

 201+ years 



52 

 73 

 88 

 113 

 131 

 180 

 289 



"2i 



15 

 25 

 18 

 49 

 109 







.16 



.72 



1.67 



3.12 



15.67 



18.3 



0.99 

 30.7 

 82.7 

 150.9 

 196.2 

 203.0 

 450. 5 







.8 



1.7 



4.2 



9.5 



19.0 



83.6 











1.2 



2.4 



2.5 



281.3 



135.9 







.8 



1.6 



4.0 



9.2 



33.6 



85.0 





 .04 

 .06 

 .10 

 .29 

 .19 

 .59 





 



.08 

 .05 

 .007 



5.7 









 .04 

 .055 

 .09 

 .29 

 .50 

 .47 



37 

 58 

 73 

 40 

 43 

 4 

 1 





 4 



38 

 63 



83 

 68 

 37 





 

 5 

 8 

 3 

 4 

 1 





 4 

 43 

 71 

 86 

 72 

 38 





 6 

 37 

 64 

 67 

 94 

 97 



Total 



125 





7.8 





18.1 



61.6 



21.6 









256 



293 





 3 

 11 

 30 

 156 

 61 

 55 



21 





 1 

 13 

 11 

 18 

 21 

 14 



314 





 4 

 24 

 41 

 174 

 82 

 69 



55 













Slope sites: 



41 to 60 years 



61 to 80 years '. 



81 to 100 years 



101 to 120 years... 

 121 to 160 years... 

 161 to 200 years... 

 201+ years 



48 

 65 

 91 

 110 

 137 

 164 

 343 





 17 

 26 

 19 

 27 

 27 

 179 







.06 



.37 



.45 



2.34 



2.36 



14.67 



2.7 

 4.6 

 11.2 

 57.9 

 178.9 

 237.3 

 485.2 





 .03 

 .19 

 .8 

 5.7 

 7.3 

 76.3 





 .14 

 .16 

 .295 



6.0 



5.1 

 56.0 





 .055 

 .17 

 .6 



5.7 



6.7 

 72.2 







.0015 

 .006 

 .03 

 .18 

 .06 

 .38 







.008 

 .001 

 .007 

 .21 



".'28' 







.003 



.0045 



.025 



.19 



.04 



.36 



50 

 56 

 74 

 59 

 61 

 17 

 1 







7 

 24 

 41 

 74 

 83 

 98 



Total 



139 





6.1 





17.6 



12.9 



16.7 









318 



316 



78 



394 



55 3 













SITE. 



The western white pine is found in situations which supply suffi- 

 cient moisture and shade to fill the requirements of the tree. Mois- 

 ture plays an important part in its establishment and development, 

 and this is emphasized by the fact that the western white pine attains 

 its best growth in the regions where rainfall is plentiful. 



