THE AUTHORS 



RICHARD 0. MEEUWIG, is a Research Forester and Leader of Intermountain Sta- 

 tion's Pinyon-Juniper Ecology and Management research work unit at the 

 Renewable Resources Center, University of Nevada Reno. He has B.S. 

 and M.S. degrees in forestry from the University of California Berkeley 

 and a Ph.D. in soil physics from Utah State University. 



JERRY D. BUDY, is Assistant Professor of Forestry in the Division of Renew- 

 able Natural Resources, Max C. Fleischmann College of Agriculture, 

 University of Nevada Reno. He has a B.S. from the University of Wis- 

 consin and is completing requirements for a Ph.D. in forest hydrology 

 at the University of Nevada Reno. 



RESEARCH SUMMARY 



Stem analyses of singleaf pinyon {pinus monophylla) indicate that 

 height growth rates of dominants and codominants are little affected by 

 age or competition. Each tree grows in height at an essentially constant 

 rate throughout most of its life, but height growth rates vary considerable 

 among dominant trees on the same site. This variation is probably because 

 of genetic differences. Diameter growth rate appears to be unaffected by 

 age but is sensitive to competition. Stand basal area increases at an ex- 

 ponential rate until the understory shrubs are suppressed; then the rate of 

 stand basal area increase becomes relatively constant. Stand biomass 

 accumulation rates follow a similar pattern, tending to become constant after 

 the understory shrubs have been suppressed. 



