I 



Hann , David W. 



1980. Development and evaluation of an even- and uneven- 

 aged ponderosa pine/Arizona fescue stand simulator. USDA 

 For. Serv. Res. Pap. INT-267, 95 p. Intermt. For. and 

 Range Exp. Stn. , Ogden, Utah 84401. 



This paper describes the construction and validation of a 

 simulator for predicting even-aged and uneven-aged stand devel- 

 opment for the ponderosa pine/Arizona fescue habitat type of 

 the Southwest. The resulting simulator characterizes the stand 

 by the number of trees in 1-inch diameter classes for two 

 vigor components of the stand. Stand dynamics are represented 

 by models for predicting upgrowth, mortality, vigor class 

 conversion, and ingrowth. 



KEYWORDS: Pinus ponderosa, growth, mortality, ingrowth, 



conversion, forest management, linear regression, 

 nonlinear regression, validation. 



Hann, David W. 



1980. Development and evaluation of an even- and uneven- 

 aged ponderosa pine/Arizona fescue stand simulator. USDA 

 For. Serv. Res. Pap. INT-267, 95 p. Intermt. For. and 

 Range Exp. Stn., Ogden, Utah 84401. 



This paper describes the construction and validation of a 

 simulator for predicting even-aged and uneven-aged stand devel- 

 opment for the ponderosa pine/Arizona fescue habitat type of 

 the Southwest. The resulting simulator characterizes the stand 

 by the number of trees in 1-inch diameter classes for two 

 vigor components of the stand. Stand dynamics are represented 

 by models for predicting upgrowth, mortality, vigor class 

 conversion, and ingrowth. 



KEYWORDS: Pinus ponderosa, growth, mortality, ingrowth, 



conversion, forest management, linear regression, 

 nonlinear regression, validation. 



