Biomass functions
About biomass calculations in Heureka
In Heureka the amount of biomass is caclulated with different functions depending on tree species, tree age and tree fraction (what part of the tree).
Functions used
Established stands, above ground
For established stands (i.e. mean heigth ≥ 7m) you can choose either Petersson 1999 [1] or Marklund [2]. This is done on control table Production Model.
Young stands, above ground
For young stands, above ground tree biomass is calculated with Claesson et al 2001 [3]
Stumps and roots ≥ 2 mm
Biomass in stumps and and roots are calculated with Petersson & Ståhl (2006)[4]. These functions include roots with a diameter ≥ 2 mm. Today there are no biomass for stumps and roots in young stands, but starting from Heureka version 2.4 Petersson & Ståhl (2006) are used also in young stands.
Functions used when selected Marklund for above-ground biomass in established stands
Correction for other species than pine, spruce or birch
The functions desribed above are available for pine, spruce and birch. For other broad-leaves than birch, the birch functions are used but then calibrated using conversion factors between the subject tree species "normal" wood density and the wood density for birch according to http://sv.wikipedia.org/wiki/Trädslag. For larch and lodgepole pine, the functions for pine are used, and then adjusted with the corresponding conversion factors.
References
- ↑ Petersson, Hans (1999). Biomassafunktioner för trädfaktorer av tall, gran och björk i Sverige. Umeå: Fakulteten för skogsvetenskap > Institutionen för skoglig resurshushållning, Sveriges lantbruksuniversitet. Arbetsrapport / Sveriges lantbruksuniversitet, Institutionen för skoglig resurshushållning och geomatik ; 59
- ↑ Marklund, Lars Gunnar (1988). Biomass functions pine, spruce and birch in Sweden. Report 45. Department of Forest Survey. Swedish University of Agricultural Sciences. ISBN 91-576-3524-2
- ↑ Claesson, S., Sahlén, K. & Lundmark, T. 2001. Functions for biomass estimation of young Pinus sylvestris , Picea abies and Betula spp. from stands in northern Sweden with high stand densities. Scandinavian Journal of Forest Research 16: 138-146.
- ↑ Petersson, H. & Ståhl, G. 2006. Functions for below-ground biomass of Pinus sylvestris, Picea abies, Betula pendula and Betula pubescens in Sweden. Scandinavian Journal of Forest Research 21(Suppl 7): 84-93.