Ecological Archives A-010-002-A2

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


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