Grassland below-ground net primary productivity (BNPP) for USA IBP sites as reported 

[units are g/m2/year]

Sitecode; Sitename       ; Location                  ; Lat.  ; Long.  ; Years;  Avg Reptd;    
                                                                  
BRD; (Bridger)           ; Bozeman, Montana          ; 45.78 ; -110.78;     1;     471;   
CPR; (CPER/SGS)          ; Nunn, Colorado            ; 40.82 ; -104.77;     3;     568;   
CTT; (Cottonwood)        ; Cottonwood, S. Dakota     ; 43.95 ; -101.87;     3;     547;   
DCK; (Dickinson)         ; Dickinson, N. Dakota      ; 46.90 ; -102.82;     1;     932;   
HYS; (Hays)              ; Hays, Kansas              ; 38.87 ; -99.38 ;     1;    1062;   
JRN; (Jornada IBP site)  ; Las Cruces, New Mexico    ; 32.60 ; -106.85;     3;     147;   
OSG; (Osage)             ; Pawhuska/ Tulsa, Oklahoma ; 36.95 ; -96.55 ;     3;     542;   
PNT; (Pantex)            ; Amarillo, Texas           ; 35.30 ; -101.53;     3;     633;   


Avg Reptd  - Average BNPP for ungrazed plots reported by Sims and Singh (1978) J. Ecol. 66, 573-597  
             (sum of significant increases in root biomass by depth, plus [where available]
              sum of statistically significant positive increases in crown biomass)

Years = number of years of data available in ORNL DAAC database

N.B. Crown production and root production were reported separately for CTT, CPR, OSG, and PNT