Ecological Archives A024-082-A4

Fugui Wang, David J. Mladenoff, Jodi A. Forrester, Juan A. Blanco, Robert M. Scheller, Scott D. Peckham, Cindy Keough, Melissa S. Lucash, Stith T. Gower. 2014. Multimodel simulations of forest harvesting effects on long-term productivity and CN cycling in aspen forests. Ecological Applications 24:1374–1389. http://dx.doi.org/10.1890/12-0888.1

Appendix D. PnET-CN parameters.

Parameter

Value

Source

Site variables

 

 

water holding capacity, plant available water, cm

10.71

SSURGO

canopy light attenuation constant (no units)

0.56

(Chen et al. 1997; White et al. 2000)

specific leaf weight at top of canopy, g m-2

80.26

(Jurik 1986)

growing degree days at which foliar production begins

196

PRISM

growing degree days at which foliar production ends

400

 

growing degree days at which wood production begins

196

 

growing degree days at which wood production ends

2460

 

 

 

 

Photosynthesis Variables

 

 

intercept /relationship-foliar N-max photosynthesis rate,

 -46

slope \ umoles CO2  m-2 leaf.sec-1

 71.9

 

half saturation light level, umoles m-2sec

250

(Hogg et al. 2000)

minimum temp. for photosynthesis, ºC

4

(Jones et al. 1985)

Q10 value for foliar respiration

2.1

(Griffis et al. 2004)

 

 

 

Water Balance Variables

 

 

/ coefficients for power function converting VPD to

0.02

(Hogg et al. 2000)

\fraction loss of photosynthesis

4.3

(Hogg et al. 2000)

fraction of precipitation intercepted and evaporated

0.123

(DeByle 1985)

constant in equation for WUE as a function of VPD

10.9

 

fraction of water inputs lost directly to drainage

 0.1

 

soil water release parameter

0.04

 

 

 

 

Carbon Allocation Variables

 

 

carbon as fraction of foliage mass

0.5

 

intercept / of relationship between

0

(Aber et al. 1985)

slope, foliar and root allocation

-2.0

 

growth respiration, fraction of allocation

0.21

(Griffis et al. 2004)

ratio of line root maintenance resp. to biomass production

0.536

(Desrochers et al. 2002)

wood maid resp. as a fraction of gross photosynthesis

0.056

(Griffis et al. 2004)

Fraction of PlantC held in reserve after allocation to BudC

 0.75

 

minimum ratio of C allocation to wood and foliage

  1.5

 

 

 

 

Biomass Turnover and N Concentration Variables

 

 

fractional loss of mass as CO, in wood decomposition

 0.8

 

max. N constant in PlantN pool, g m-2

  20

 

decomposition constant for SOM pool, yr-1

 0.075

 

min.N concentration in root litter

0.016

(Hessl et al. 2004)

min N Concentration in foliar litter

0.0075

(Stump and Binkley 1993)

min. N concentration in wood litter

0.00144

(Hessl et al. 2004)

Literature Cited

Aber, J. D., J. M. Melillo, K. J. Nadelhoffer, C. A. Mcclaugherty, and J. Pastor. 1985. Fine root turnover in forest ecosystems in relation to quantity and form of nitrogen availability - a comparison of 2 methods. Oecologia 66:317–321.

Chen, J. M., P. D. Blanken, T. A. Blank, M. Guilbeault, and S. Chen. 1997. Radiation regime and canopy architecture in a boreal aspen forest. Agricultural and Forest Meteorology 86:107–125.

DeByle, N. V. 1985. Water and watershed. Pages 153–160 in N. V. DeByle and R. P. Winokur, editors. Aspen: ecology and management in the western United States. USDA Forest Service Rocky Mountain Forest and Range Experiment Station, Flagstaff, Arizona.

Desrochers, A., S. M. Landhausser, and V. J. Lieffers. 2002. Coarse and fine root respiration in aspen (Populus tremuloides). Tree Physiology 22:725–732.

Griffis, T. J., T. A. Black, D. Gaumont-Guay, G. B. Drewitt, Z. Nesic, A. G. Barr, K. Morgenstern, and N. Kljun. 2004. Seasonal variation and partitioning of ecosystem respiration in a southern boreal aspen forest. Agricultural and Forest Meteorology 125:207–223.

Hessl, A. E., C. Milesi, M. A. White, D. L. Peterson, and R. E. Keane. 2004. Ecophysiological parameters for Pacific northwest trees.in P. N. R. S. USDA Forest Service, editor.

Hogg, E. H., B. Saugier, J. Y. Pontailler, T. A. Black, W. Chen, P. A. Hurdle, and A. Wu. 2000. Responses of trembling aspen and hazelnut to vapor pressure deficit in a boreal deciduous forest. Tree Physiology 20:725–734.

Jones, J. R., M. R. Kaufmann, and E. A. Richardson. 1985. Effects of water and temperature. Pages 71–76 in N. V. DeByle and R. P. Winokur, editors. Aspen: ecology and management in the western United States. USDA Forest Service Rocky Mountain Forest and Range Experiment Station.

Jurik, T. W. 1986. Temporal and spatial patterns of specific leaf weight in successional northern hardwood tree species. American Journal of Botany 73:1083–1092.

Stump, L. M., and D. Binkley. 1993. Relationships between litter quality and nitrogen availability in Rocky-Mountain forests. Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere 23:492–502.

White, M. A., P. E. Thornton, S. W. Running, and R. R. Nemani. 2000. Parameterization and sensitivity analysis of the BIOME-BGC terrestrial ecosystem model: net primary production controls. Earth Interactions 4:1–85.


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