164 FOREST RF,GUI,.\'rrOX 



In these properties of the Southern Pinery, clanger from insects 

 must be considered and may require immediate attention in regulat- 

 ing not merely the cut in \'olume but also in location, i. e., attend to 

 a proper distribution of the Age Classes, or stands of different age, 

 and with this of Cutting Series. For it is just in these forests of 

 rapid growth where changes in conditions come fast and often, and 

 where every stand must be in position for independent treatment. 



4. Regulation in Lodge Pole Pine. 



Typical case : property of 500,000 acres ; Rocky Mountain coun- 

 try, largely' plateau and large slopes, fairly accessible. Forest 

 practically y^ine Lodge Pole ; at higher altitudes a timiber-line 

 country with Engelman Spruce, often mixed with Lodge Pole, pri- 

 marily protective forest. Considerable areas of bare, grazing lands. 

 Market is good for railway ties, poor for lumber. The following 

 conditions hold : 



a. Total .'Vrea : 500,000 acres. 



b. Area in woods about 400,000 acres ; rest in prairie and waste. 



c. Conditions of wood lands as per detail cruise bv forty acre 

 lots: 



1. Cut-over lands, and burns practically bare now, 41,000 acres 

 with reproduction expected in next twenty years. 



2. "Jack P'ine", stuff below 4" d. b. h. and 25 ft. in height 

 142,000 acres. 



3. Poles, average 5" d. b. h. (4-6") — 6,000 acres. 



4. Stands of Larger Poles 6-10", 80-120 years old — none. 



5. Merchantable Timber 120-250 years old — 194,000 acres. 



d. Rotation is set at 200 years, (approximate average age of 

 mature timber), and assumes that technical rotation continues to be 

 based on size required for ties. On this basis the above conditions 

 may be stated thus : 



I'KR CK.XT SIIOUr.D liH IF 

 OF .\Rli.V. RF,GUr..\TKn. 



Bare areas to reproduce in next 20 years 10% 9% 



Age Classes I and TI. 1-40 years old stuff 35% 18% 



Age Classes III and IV, 40-80 year old stuff. . . 6% 18% 



Age Classes V and A'l, 80-120 year old stuff. . 0% 18% 



.\ge Classes "NTT and X, 120-200 years or older. 48% 36% 



