THE AUTHORS 



RESEARCH SUMMARY 



WARREN P. CLARY, formerly principal range scientist, 

 is Project Leader in charge of Ecology and Manage- 

 ment of Shrub-Herb Rangelands of the Great Basin for 

 the Intermountain Forest and Range Experiment 

 Station. Dr Clary previously served as Project Leader 

 in charge of range studies for the Southern Forest 

 Experiment Station. He holds a Master's degree in 

 Range Management and a Ph.D. in Plant Ecology from 

 Colorado State University. 



CHESTER E. JENSEN, retired, served as principal 

 statistician for the Intermountain Forest and Range 

 Experiment Station from 1967-1980. He held the same 

 position at the Northeastern and Central States 

 Forest Experiment Stations prior to coming to the 

 Intermountain Station. Mr. Jensen, Vi^ho holds a Master 

 of Forestry degree from Michigan State University, 

 received graduate training in statistics at \owa State 

 University. 



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 betv^/een such potential and annual precipi- 

 tation, 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 or at least 

 rescaling (refitting) of the resulting interactive mathemat- 

 ical model to data from areas of application is recom- 

 mended as a precondition for interim field use. A Fortran 

 IV computer program for table output from the model is 

 included. 



CONTENTS 



Page 



INTRODUCTION 1 



HYPOTHESIS-COMPONENT SOURCES 1 



DISCUSSION OF HYPOTHESIS COMPONENTS 1 



HYPOTHESIS DEVELOPMENT AND 

 ASSOCIATED HERBAGE PRODUCTION 



POTENTIALS ,...4 



PUBLICATIONS CITED 8 



