﻿THE 
  AUTHOR 
  

  

  DAVID 
  C. 
  CHOJNACKY 
  is 
  a 
  research 
  forester. 
  Forest 
  

   Survey, 
  Intermountain 
  Forest 
  and 
  Range 
  Experiment 
  

   Station. 
  He 
  holds 
  a 
  B.S. 
  degree 
  in 
  mathematics 
  from 
  

   the 
  University 
  of 
  Idaho, 
  Moscow, 
  and 
  an 
  M.S. 
  degree 
  

   in 
  watershed 
  management 
  from 
  the 
  University 
  of 
  Ari- 
  

   zona, 
  Tucson, 
  and 
  a 
  Ph.D. 
  degree 
  in 
  forest 
  biometry 
  

   from 
  Colorado 
  State 
  University, 
  Fort 
  Collins. 
  He 
  has 
  

   been 
  with 
  the 
  Forest 
  Service 
  since 
  1979. 
  Before 
  com- 
  

   ing 
  to 
  Ogden, 
  he 
  worked 
  for 
  the 
  Forest 
  Research 
  

   Laboratory 
  at 
  Oregon 
  State 
  University, 
  Corvallis. 
  

  

  ACKNOWLEDGMENTS 
  

  

  Many 
  individuals 
  contributed 
  to 
  this 
  interagency 
  

   effort 
  in 
  the 
  organizational, 
  field, 
  and 
  data 
  entry 
  

   phases. 
  Participants 
  were 
  from 
  the 
  U.S. 
  Department 
  of 
  

   Agriculture, 
  Forest 
  Service; 
  U.S. 
  Department 
  of 
  the 
  In- 
  

   terior, 
  Bureau 
  of 
  Land 
  Management 
  and 
  Bureau 
  of 
  In- 
  

   dian 
  Affairs; 
  Colorado 
  State 
  Forest 
  Service; 
  and 
  Ne- 
  

   vada 
  Division 
  of 
  Forestry. 
  Unfortunately. 
  I 
  was 
  not 
  able 
  

   to 
  meet 
  many 
  of 
  those 
  who 
  had 
  key 
  roles 
  in 
  this 
  

   study— 
  I 
  only 
  saw 
  the 
  data. 
  However, 
  I 
  would 
  like 
  to 
  

   mention 
  the 
  Nevada 
  BLM 
  district 
  foresters 
  who 
  helped 
  

   me 
  get 
  a 
  field 
  perspective 
  on 
  pinyon-juniper 
  wood- 
  

   lands: 
  Jack 
  Matuska 
  (Battle 
  Mountain), 
  Mike 
  McGinty 
  

   (Carson 
  City), 
  John 
  McGlothlin 
  (formerly 
  Ely, 
  presently 
  

   Burns, 
  OR, 
  BLM), 
  Harry 
  Rhea 
  (Ely), 
  and 
  Skip 
  Ritter 
  

   (Elko). 
  

  

  RESEARCH 
  SUMMARY 
  

  

  Gross 
  cubic 
  foot 
  volume 
  equations 
  are 
  now 
  avail- 
  

   able 
  for 
  pinyon-juniper 
  and 
  several 
  other 
  woodland 
  

   species 
  in 
  Nevada, 
  Idaho. 
  Utah, 
  Colorado, 
  Wyoming, 
  

   and 
  South 
  Dakota. 
  The 
  volume 
  equations 
  are 
  based 
  on 
  

   data 
  collected 
  as 
  a 
  subsample 
  of 
  woodland 
  invento- 
  

   ries 
  conducted 
  by 
  Federal 
  and 
  State 
  land 
  management 
  

   agencies. 
  In 
  these 
  inventories, 
  volumes 
  of 
  4,705 
  trees 
  

   were 
  estimated 
  by 
  a 
  visual 
  sampling 
  method. 
  

  

  Use 
  of 
  the 
  equations 
  requires 
  measurement 
  of 
  a 
  

   tree's 
  diameter 
  at 
  the 
  root 
  collar 
  (DRC), 
  total 
  height, 
  

   and 
  number 
  of 
  basal 
  stems. 
  Thirteen 
  equations, 
  

   applicable 
  to 
  different 
  parts 
  of 
  a 
  species' 
  range, 
  are 
  

   presented 
  for 
  Utah 
  juniper, 
  western 
  juniper. 
  Rocky 
  

   Mountain 
  juniper, 
  oneseed 
  juniper, 
  singleleaf 
  pinyon, 
  

   pinyon, 
  Gambel 
  oak, 
  bur 
  oak, 
  mountain-mahogany, 
  and 
  

   a 
  group 
  of 
  woodland 
  hardwoods. 
  

  

  A 
  test 
  of 
  several 
  equations 
  against 
  some 
  local 
  vol- 
  

   ume 
  data 
  revealed 
  prediction 
  errors 
  up 
  to 
  20 
  percent 
  

   or 
  more 
  in 
  half 
  the 
  cases. 
  However, 
  the 
  equations 
  

   should 
  be 
  adequate 
  for 
  use 
  in 
  large 
  State-wide 
  wood- 
  

   land 
  inventories. 
  

  

  CONTENTS 
  

  

  Introduction 
  1 
  

  

  Review 
  of 
  Past 
  Work 
  1 
  

  

  Data 
  Collection 
  2 
  

  

  Data 
  Analysis 
  2 
  

  

  Important 
  Predictor 
  Variables 
  2 
  

  

  Equation 
  Form 
  3 
  

  

  Number 
  of 
  Equations 
  5 
  

  

  Reliability 
  of 
  Equations 
  6 
  

  

  Discussion 
  9 
  

  

  References 
  10 
  

  

  Appendix 
  A 
  11 
  

  

  Glossary 
  of 
  Terms 
  11 
  

  

  Species 
  List 
  11 
  

  

  Figures 
  8-11 
  12 
  

  

  Table 
  5 
  16 
  

  

  Appendix 
  B 
  18 
  

  

  Tables 
  6-18 
  18 
  

  

  Cover 
  Photo: 
  Over 
  looking 
  the 
  nnain 
  fork 
  of 
  Elk 
  Creek 
  near 
  New 
  Castle, 
  CO. 
  

  

  