**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/m^{2}) |
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 |