Christopher Daly, Dominique Bachelet, James M. Lenihan,
Ronald P. Neilson, William Parton, and Dennis Ojima. 2000. Dynamic simulation
of tree-grass interactions for global change studies. Ecological Applications
10: 449-469.
Appendix B
Lifeform-varying biogeochemistry module parameters
Table B-1. Tree parameters from standard CENTURY (Bill Pulliam, pers. comm.). D = deciduous, N = needleleaf, E = evergreen, B = broadleaf.
Table B-2. Grass parameters from standard CENTURY (Bill Pulliam, pers. comm.).
Table B-1. Tree parameters from standard CENTURY (Bill Pulliam, pers. comm.). D = deciduous, N = needleleaf, E = evergreen, B = broadleaf.
| Parameter | Description | DN | EN | DB | EB |
| Production | |||||
| prdx(3) | Maximum forest production (gC/m2) | 10000 | 10000 | 10000 | 10000 |
| Poisson Density Function (PDF) for Temperature Effects on Growth | |||||
| ppdf(1) | Optimum PDF temperature for production (C) | 15 | 15 | 25 | 30 |
| ppdf(2) | Maximum PDF temperature for production (C) | 30 | 30 | 35 | 45 |
| ppdf(3) | Left PDF temperature curve shape | 1 | 1 | 1 | 1 |
| ppdf(4) | Right PDF temperature curve shape | 5 | 5 | 3.5 | 2.5 |
| C/N Ratios | |||||
| cerfor(1,1,1) | Minimum C/N ratio for leaves | 100 | 100 | 20 | 20 |
| cerfor(1,2,1) | Minimum C/N ratio for fine roots | 50 | 50 | 35 | 35 |
| cerfor(1,3,1) | Minimum C/N ratio for fine branches | 310 | 310 | 80 | 120 |
| cerfor(1,4,1) | Minimum C/N ratio for large wood | 900 | 900 | 140 | 150 |
| cerfor(1,5,1) | Minimum C/N ratio for coarse roots | 600 | 600 | 83 | 150 |
| cerfor(1,1,1) | Maximum C/N ratio for leaves | 100 | 100 | 40 | 40 |
| cerfor(1,2,1) | Maximum C/N ratio for fine roots | 81 | 81 | 50 | 60 |
| cerfor(1,3,1) | Maximum C/N ratio for fine branches | 310 | 310 | 99 | 180 |
| cerfor(1,4,1) | Maximum C/N ratio for large wood | 800 | 800 | 140 | 300 |
| cerfor(1,5,1) | Maximum C/N ratio for coarse roots | 80 | 80 | 500 | 300 |
| cerfor(1,1,1) | Initial C/N ratio for leaves | 90 | 90 | 40 | 40 |
| cerfor(1,2,1) | Initial C/N ratio for fine roots | 80 | 80 | 50 | 76 |
| cerfor(1,3,1) | Initial C/N ratio for fine branches | 300 | 300 | 80 | 84 |
| cerfor(1,4,1) | Initial C/N ratio for large wood | 900 | 900 | 140 | 155 |
| cerfor(1,5,1) | Initial C/N ratio for coarse roots | 550 | 550 | 80 | 155 |
| Carbon Allocations | |||||
| fcfrac(1,2) | C allocation fraction to leaves | 0.4 | 0.4 | 0.3 | 0.3 |
| fcfrac(2,2) | C allocation fraction to fine roots | 0.3 | 0.3 | 0.4 | 0.3 |
| fcfrac(3,2) | C allocation fraction to fine branches | 0.1 | 0.1 | 0.1 | 0.1 |
| fcfrac(4,2) | C allocation fraction to large wood | 0.2 | 0.2 | 0.2 | 0.2 |
| fcfrac(5,2) | C allocation fraction to coarse roots | 0 | 0 | 0 | 0.1 |
| Biomass Death Rates | |||||
| leafdr(1-11) | Jan-Nov monthly death rate fraction for leaves | 0 | 0 | 0 | 0.1 |
| leafdr(12) | Dec monthly death rate fraction for leaves | 0 | 0.1 | 0 | 0.1 |
| wooddr(1) | Fraction of forest which is deciduous | 1 | 0 | 1 | 0 |
| wooddr(2) | Monthly death rate fraction for fine roots | 0.1 | 0.1 | 0 | 0 |
| wooddr(3) | Monthly death rate fraction for fine branches | 0 | 0 | 0 | 0 |
| wooddr(4) | Monthly death rate fraction for large wood | 0 | 0 | 0 | 0 |
| wooddr(5) | Monthly death rate fraction for coarse roots | 0 | 0 | 0 | 0 |
| Leaf Area | |||||
| klai | Factor relating lai to large wood biomass | 2000 | 2000 | 1000 | 1000 |
| maxlai | Theoretical maximum LAI in mature forest | 10 | 10 | 10 | 10 |
| Site Potential | |||||
| sitpot | N fraction apportioned to grasses in savanna | 4800 | 4800 | 2400 | 2400 |
Table B-2. Grass parameters from standard CENTURY (Bill Pulliam, pers. comm.).
| Parameter | Description | C3 | C4 |
| Production | |||
| prdx(3) | Potential aboveground production (gC/m2) | 300 | 400 |
| Poisson Density Function (PDF) for Temperature Effects on Growth | |||
| ppdf(1) | Optimum PDF temperature for production (C) | 18 | 30 |
| ppdf(2) | Maximum PDF temperature for production (C) | 32 | 45 |
| ppdf(3) | Left PDF temperature curve shape | 1.2 | 1.0 |
| ppdf(4) | Right PDF temperature curve shape | 3 | 3 |
| C/N Ratios | |||
| pramn(1,1) | Minimum C/N ratio with zero biomass | 20 | 20 |
| pramn(1,2) | Minimum C/N ratio with maximum biomass | 30 | 30 |
| pramx(1,1) | Maximum C/N ratio with zero biomass | 30 | 30 |
| pramx(1,2) | Maximum C/N ratio with maximum biomass | 40 | 80 |
| prbmn(1,1) | Intercept for C/N ratio vs precip function | 40 | 60 |
| prbmx(1,1) | Slope for C/N ratio vs precip function | 50 | 80 |