CONTENTS 



Page 



Introduction 01 



Methods 03 



Field Methods 03 



Data Analysis 04 



Other Considerations 07 



The Classification: Vegetation Key 08 



Type Descriptions 13 



Populus tremuloides/Acer 



grandidentatum/Pteridium aquilinum c.t 13 



Populus tremuloides/Prunus virginiana/Senecio 



serra c.t 14 



Populus tremuloides/Prunus virginiana/Carex 



geyeri c.t 15 



Populus tremuloides/Sambucus racemosa c.t 15 



Populus tremuloides/Symphoricarpos oreophilus/ 



Senecio serra c.t 16 



Populus tremuloides/Symphoricarpos oreophilus/ 



Carex geyeri c.t 17 



Populus tremuloides/Symphoricarpos oreophilus/ 



Festuca thurberi c.t 18 



Populus tremuloides/Juniperus communis/Carex 



geyeri c.t 18 



Populus tremuloides/Juniperus 



communis/Sitanion hystrix c.t 20 



Populus tremuloides/Symphoricarpos oreophilus/ 



Bromus carinatus c.t 20 



Populus tremuloides/Symphoricarpos oreophilus/ 



Poa pratensis c.t 21 



Populus tremuloides/Juniperus 



communis/Astragalus miser c.t 21 



Populus tremuloides/Veratrum californicum c.t. ... 22 



Populus tremuloides/Heracleum lanatum c.t 22 



Populus tremuloides/Pteridium aquilinum c.t 23 



Populus tremuloides/Senecio serra c.t 24 



Populus tremuloides/Carex geyeri c.t 26 



Populus tremuloides/Festuca thurberi c.t 27 



Populus tremuloides/Sitanion hystrix c.t 28 



Populus tremuloides/Bromus carinatus c.t 28 



Populus tremuloides/Poa pratensis c.t 29 



Populus tremuloides-Abies lasiocarpa/Vaccinium 



caespitosum c.t 30 



Populus tremuloides-Abies 



lasiocarpa/Amelanchier ainifolia c.t 31 



Populus tremuloides-Abies lasiocarpa/ 



Symphoricarpos oreophilus/Senecio serra c.t 31 



Populus tremuloides-Abies lasiocarpa/ 



Symphoricarpos oreophilus/Carex geyeri c.t 32 



Populus tremuloides-Abies lasiocarpa/Juniperus 



communis c.t 33 



Populus tremuloides-Abies lasiocarpa/Senecio 



serra c.t 33 



Page 



Populus tremuloides-Abies lasiocarpa/Carex 



geyeri c.t 35 



Populus tremuloides-Abies concolor/ 



Symphoricarpos oreophilus c.t 36 



Populus tremuloides-Abies concolor/Juniperus 



communis c.t 36 



Populus tremuloides-Pseudotsuga 



menziesii/Amelanchier ainifolia c.t 37 



Populus tremuloides-Pseudotsuga menziesii/ 



Juniperus communis c.t 37 



Populus tremuloides-Pinus ponderosa/Quercus 



gam belli c.t 38 



Populus tremuloides-Pinus ponderosa/Juniperus 



communis c.t 38 



Populus tremuloides-Pinus contorta/Vaccinium 



scoparium c.t 39 



Populus tremuloides-Pinus contorta/Juniperus 



communis c.t 40 



References 41 



Appendix A: Constancy and Average Canopy Cover 



of Important Species by Aspen Community 



Types in 



Utah 42 



Appendix B1: Means, Standard Errors (SE), and 

 Ranges of Basal Area, Stand Age, Stand Height, 

 and Site Index for Populus tremuloides by 

 Community Types in Utah, in Metric Units 54 



Appendix 82: Means, Standard Errors (SE), and 

 Ranges of Basal Area, Stand Size, Stand Height, 

 and Site Index for Populus tremuloides by 

 Community Types in Utah, in English Units 56 



Appendix C: Means, Standard Errors (SE), and 

 Ranges of Tree Basal Area, and Percent of this 

 Basal Area Consisting of Conifers, by 

 Community Type in Utah 59 



Appendix D1: Means, Standard Errors (SE), and 

 Ranges of Annual Undergrowth Production by 

 Vegetation Classes Expressed in Dry Weight 

 Kilograms per Hectare 62 



Appendix D2: Means, Standard Errors (SE), and 

 Ranges of Annual Undergrowth Production by 

 Vegetation Classes Expressed in Dry Weight 

 Pounds per Acre 64 



Appendix E: Proportion of Yearly Undergrowth 

 Production in Different Vegetation Categories by 

 Aspen Community Types, and the Suitability of 

 this Undergrowth as Livestock Forage 67 



Appendix F: Proportion of Aspen Stands Sampled 

 in Each of Utah's National Forests that Were 

 Classified in Different Aspen Community Types . 68 



Appendix G: Utah Aspen Community Type Field 



Form 69 



