Within the range of the data on which these equations were based, P will range in 

 value between zero and unity, so dividing SI, as computed above, by P gives the proper 

 adjustment to compensate for the reduction in stand height. 



These equations were not based on data including ages over 200 years. Therefore we 

 recommend that ages older than 200 be reduced to 200 years. 



SDB^OUTINF L PSITF( A ,H,CCF» S) 

 niMFNSinN R(9) 



DATA P /IR, 31 0745 ,0, 21 ? 7D-0 2 , Oo 8 1> 70 4? 50-05 1 e> 4. 32 1 3 ^ , ^ 5 ? R , 37 11 , 

 1-^4P4R, 28 Q, 0, 81 R 367020-0 3 1 1.02 9 54f. ,0e 62 972 51 / 

 IF( A )?,2,1 



1 IP(H)2,2,3 



2 WRITF(6,2C1) 

 S=0,0 

 DFTlJPN 



3 CCFT=CCF-125oO 



FA = B( 1 )*( ALOr,( A ) -4„ 6051 70? ) -B ( 2 ) *( A *A- 1 000? „ I +B ( 3 ) * ( A ♦«3- 1 0, 0* * 6 ) 

 Ga=-R(4»*(loC/A-.01)+B(5)*(lo/(A*A)-,0001)-P(6»*(A«*(-?, 5) -o 00001) 

 pn = pA + H*( GA + 1. > 

 IF(CCFT)4,4,5 



4 CCFT=0,0 



5 FK=B(7)*CCFT 

 Pl=EK«fGA+1.0)-lo^ 

 SI =-pr/Pl 



S = P( R) +B(9 >*S! 

 RETURN 



?n\ PDRMAT {62HC!=ITHER AGE OR HEIGHT OF A I nOGEPOLE PINF IS NEGATIVE OR 

 1 ZERO. ) 

 END 



Figure 5. — The site index estimating subroutine for lodgepole pine. 



9 



