Clary, Warren P., and Chester E. Jensen. 

 1981. Mathematical hypothesis for the herbage production potential on pinyon- 

 juniper areas. USDA For. Serv. Res. Pap. INT-279, 8p. Intermt. For. and Range 

 Exp. Stn., Ogden, Utah 84401. 



Herbage production potential of clearcut pinyon-juniper areas can be of critical 

 interest to land managers. Published information is the basis for the theorized form 

 of the relation between such potential and annual precipitation, original tree cover, 

 soil nitrification level, and presence or absence of limestone soil. The fundamental 

 expected effects appear to exist in a small data set from north-central Arizona. 

 Estimates of specific forms and scales of the effects are made from data trends, within 

 the constraints of expectation. Validation orat least rescaling (refitting) of the resulting 

 interactive mathematical model to data from areas of application is recommended as 

 a precondition for interim field use. A Fortran IV computer program for table output 

 from the model is included. 



KEYWORDS: hypothesis, mathematical model, herbage production, pinyon-juniper, 

 precipitation, cover, nitrate, soil type 



•{t U.S. government printing OFFICE: 1981 — 777-028/1 10 Region No. 8 



