Modelingforest Harvest Effects on Carbon Stores

ModelingForest Harvest Effects on Carbon Stores

FOR ONLINE PUBLICATION ONLY

Appendix 1. Parameter Values used in the STANDCARB 2.0 Model for the Simulation Experiments

Parameter (units)Species

Tree establishmentDouglas-firbothwestern hemlock

LightMax (fraction of full sunlight)1.000.90

LightMin (fraction of full sunlight)0.100.02

Degree DayMax (degrees C)30953095

Degree DayMin (degrees C)625625

Tree Soil WaterMax (MPascals)-0.2-0.1

Tree Soil WaterMin (MPascals)-2.0-1.7

Growth

Light Comp Point (%)52

Light Ext Coeff (ha Mg-1) 0.150.15

Foliage Increase RateMax (dimensionless)1.00.6

Fine Root:Foliage Ratio (dimensionless)0.330.33

Branch:Bole Ratio (dimensionless)0.250.5

Coarse Root:Bole Ratio (dimensionless)0.620.52

Sapwood Alive (% sapwood volume)14.05.7

Live Q10 (dimensionless)2.02.0

Woody Resp Rate (year -1)0.017

Rate Heartwood Form (year -1)0.050.03

HeightMax (m)9085

Canopy Interception Const (mass-1)0.006

Heart-rot lag (years)120100

Heart-rot formation rate (year-1)0.00350.02

Mortality

Tree MortalityMax (year-1). 0.0150.015

Branch PruneMax (year-1)0.020.02

Coarse Root PruneMax (year-1)0.0050.005

Tree AgeMax (years). 800700

FoliageTurnover Rate (year-1)0.20.2

Fine RootTurnover Rate (year-1)0.50.5

Time to Full Crown Diameter (years)150

Parameter (units)Species

DecompositionDouglas-firbothwestern hemlock

Foliage Decay Rate10 (year-1) 10.20.15

Fine Root Decay Rate10 (year-1)0.150.15

Branch Decay Rate10 (year-1 )0.070.10

Coarse Root Decay Rate10 (year-1 )0.070.12

Sapwood Decay Rate10 (year-1)0.100.10

Heartwood Decay Rate10 (year -1)0.080.10

Lag in Stable Foliage formation (years)5

Lag in Stable Wood formation (years)20

Lag in Stable Soil formation (years)5-102

Stable Foliage Decay Rate10 (year-1)10.20

Stable Wood Decay Rate10 (year-1)10.05

Stable Soil Decay Rate10 (year-1)10.02

Decay Q10 (dimensionless) 2

Decay Temp Opt (C) 45

MoistMin (% mass or volume) 30

MoistMax (% mass or volume) 95-5503

Drying Constant (cm2 degrees-1 cal-1) 0.0007-0.00154

Moist StoreMax (%mass) 200-6005

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1-decay rates are for 10 C with no moisture limitations

2-The lower value is for dead fine roots and higher value for dead coarse roots

3- parameter values depends on detritus pool, with woody detritus having a lower maximum moisture limit than dead foliage or fine roots.

4-parameter values depends on detritus pool, with coarse woody detritus having lower drying rate constant than dead branches or dead foliage.

5-parameter value depends on detritus or stable pool, with woody materials having lower values than dead foliage and dead fine roots. An exception is that stable wood has the highest value.

Species-specific parameter values indicated under species name; general ones indicated under both.

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