Table 6 — Prediction equations for estimating ovendry weight of the aboveground biomass of Utah juniper trees greater than 10 

 cm at the root collar (basis: 33 trees) 



Tree Standard error Percent mean Percent 



component 



Equation 1 





R 2 



of estimate 



error 



bias 



Total LnW= 



0.296 + 0.845 (LnDBH) + 1.444 (LnC) 





0.963 



0.210 



20.0 



-0.6 



>2.5 cm 



-1.232 + 1.113 (LnDBH) + 1.466 (LnC) 





.966 



.232 



23.8 



-0.5 



>7.6 cm 



-1 .423 + 1 .241 (LnDBH) + 0.347 (LnDBH.LnC) - 0.274 (LnS) 



.968 



.243 



24.4 



-0.2 



<7.6 cm = 



-0.951 + 1.118 (LnDBH) + 2.703 (LnC) - 



0.394 (LnDBH'LnC) 



.950 



.232 



22.3 



-1.6 



2.5 to 7.6 cm 



-3.467 + 1 .293 (LnDBH) + 3.693 (LnC) - 



0.552 (LnDBH'LnC) 



.937 



.314 



34.7 



-1.8 



0.64 to 2.5 cm 



-3.182 + 1.185 (LnDBH) +3.072 (LnC) - 



0.451 (LnDBH'LnC) 



.908 



.348 



42.5 



-4.2 



< 0.64 cm 



-3.388 + 1 .251 (LnDBH) + 3.071 (LnC) - 



0.553 (LnDBH'LnC) 



.921 



.271 



26.0 



-3.4 



Foliage 



0.047 + 0.616 (LnDBH) + 1.219 (LnC) 





.915 



.261 



26.9 



1.0 



'Where 



W= weight, kilograms 

 DBH= diameter at breast height, centimeters 

 C= average crown diameter, meters 

 S= number of stems at d.b.h. 

 Ln- natural logarithm, base e. 



Table 7— Predicted ovendry weights (kg) for the greater than 3 inch (7.6 cm) biomass of singleaf pinyon 



Tree height (m) 



D.s.h. 1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



D.s.h. 































Inches 



cm -- 













----kg- 

















10 



1 



2 



I 























4 



15 



3 



5 



8 



I 12 



16 



















6 



20 



5 



10 



16 



23 



I 31 



40 

















8 



25 



8 



16 



25 



37 



50 



64 



80 















10 



30 



12 



23 



38 



54 



74 



95 



119 



144 













12 



35 



17 



32 



52 



76 



103 



133 



166 



| 202 



240 











14 



40 





43 



70 



101 



137 



177 



221 



269 



320 



375 









16 



45 





56 



90 



130 



177 



228 



285 



347 



413 



484 









18 



50 





70 



113 



164 



222 



287 



358 



435 



519 



608 









20 



55 





86 



139 



201 



272 



352 



440 



535 



637 



747 



863 



986 



1115 



22 



60 







168 



243 



329 



425 



530 



645 



769 



901 



1041 



1189 



1345 



1 24 



65 







199 



289 



391 



505 



631 



767 



914 



1071 



1238 



1414 



1599 



26 



70 









339 



459 



593 



740 



900 



1072 



1257 



1452 



1659 



1877 



28 



75 









393 



532 



688 



859 



1045 



1245 



1458 



1686 



1926 



2178 



30 



80 











612 



791 



987 



1200 



1431 



1677 



1938 



2213 



2504 



32 



85 











697 



901 



1125 



1369 



1631 



1911 



2208 



2523 



2853 



34 



90 













1020 



1273 



1548 



1845 



2162 



2499 



2854 



3229 



36 



95 













1145 



1431 



1740 



2074 



2430 



2808 



3208 



3629 



38 



100 













1280 



1598 



1944 



2316 



2714 



3137 



3583 



4053 



40 



105 













1422 



1776 



2160 | 



2514 



3016 



3485 



3981 



4504 



42 



110 













1572 



1963 



2388 



2846 



3334 



3854 



4403 



4980 



44 



3 7 10 13 16 20 23 26 30 33 36 39 43 46 



Tree height (ft) 



LnW = -6.024 + 2.159 (LnDSH) + 1.663 (LnH) 

 Standard error (SE) =0.184 

 Mean error (E) = 18.6 percent 



Average bias (B) = 2.4 percent 



R 2 = 0.998 



7 



