THE AUTHORS 



RICHARD L. EVERETT is Range Scientist and Project 

 Leader of the Intermountain Station's Pinyon-Juniper 

 Ecology and Management Research Work Unit at the 

 Renewable Resources Center, University of Nevada, 

 Reno. He has a B.S. degree in biology and an M.S. in 

 range from the University of Nevada, Reno, and a 

 Ph.D. degree in range ecology from Oregon State 

 University, Corvallis. 



STEVEN H. SHARROW is Associate Professor of 

 Range, Rangeland Resources Department, Oregon 

 State University, Corvallis. He has a B.S. degree in 

 range from the University of California, Davis, and 

 M.S. and Ph.D. degrees in range from Texas Tech 

 University, Lubbock. 



RESEARCH SUMMARY 



Cover, yield, and nutrient concentrations of grasses 

 were sampled on tree-harvested and nonharvested 

 plots on north, west, and south aspects of a singleleaf 

 pinyon {Pinus rnonop/7y//a)-Utah juniper {Juniperus 

 osteosperma) stand. Grass cover increased rapidly the 

 first 2 years following tree harvest, but the rate of in- 

 crease declined over the next 2 years. Grass yield 

 varied among aspects and soil microsites on tree- 

 harvested plots but not on the nonharvested plots 

 where tree competition masked aspect and microsite 

 effects. All grass species had greater yield and greater 

 percentage nitrogen and phosphorus on harvested 

 than on nonharvested plots. Low digestibility of some 

 species may reduce potential livestock gains. On tree- 

 harvested plots, the tree-associated microsites (duff 

 and transition) had higher grass yield per unit area 

 than the interspace microsites between trees. Tree 

 harvesting decreased the area required per animal unit 

 month from 27 to 7 acres (11 to 3 ha) (north) and 42 to 

 5 acres (17 to 2 ha) (west), but had no effect on the 

 south aspect (40 acres, or 16 ha). Protein levels were 

 adequate for livestock on tree-harvested plots (north 

 and west) but below levels recommended for deer. 



