Biomass, stem basic density and expansion factor functions for five exotic conifers grown in Denmark
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Biomass, stem basic density and expansion factor functions for five exotic conifers grown in Denmark. / Nord-Larsen, Thomas; Nielsen, Anders Tærø.
In: Scandinavian Journal of Forest Research, Vol. 30, No. 2, 2015, p. 135-153.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Biomass, stem basic density and expansion factor functions for five exotic conifers grown in Denmark
AU - Nord-Larsen, Thomas
AU - Nielsen, Anders Tærø
PY - 2015
Y1 - 2015
N2 - Adequate allometric equations are needed for estimating carbon pools of fast growing tree species in relation to international reporting of CO2 emissions and for assessing their possible contribution to increasing forest biomass resources. We developed models for predicting biomass, stem basic density and expansion factors of stem to above-ground biomass for five fast growing conifers. Data included destructive measurements of 236 trees from 14 sites, covering a wide range of growth conditions. To ensure model efficiency, models for predicting stem, crown and total above-ground biomass for the five species were estimated simultaneously using a linear, mixed effects model that allowed contemporaneous correlations between the different tree components. Models differed among species and included dbh and tree height. The models explained more than 98% of the variation in above-ground biomass and reflected differences in the allometry between tree species. Stem density differed among species but generally declined with increasing site index and dbh. The overall model for predicting stem basic density included dbh, H100 and site index and explained 66% of the total variation. Expansion factors decreased from 1.8–2.0 in small trees (dbh < 10 cm) to 1.1–1.2 for large trees (dbh > 25 cm), but differed among species. The overall model explained 86% of the variation and included quadratic mean diameter and dbh.
AB - Adequate allometric equations are needed for estimating carbon pools of fast growing tree species in relation to international reporting of CO2 emissions and for assessing their possible contribution to increasing forest biomass resources. We developed models for predicting biomass, stem basic density and expansion factors of stem to above-ground biomass for five fast growing conifers. Data included destructive measurements of 236 trees from 14 sites, covering a wide range of growth conditions. To ensure model efficiency, models for predicting stem, crown and total above-ground biomass for the five species were estimated simultaneously using a linear, mixed effects model that allowed contemporaneous correlations between the different tree components. Models differed among species and included dbh and tree height. The models explained more than 98% of the variation in above-ground biomass and reflected differences in the allometry between tree species. Stem density differed among species but generally declined with increasing site index and dbh. The overall model for predicting stem basic density included dbh, H100 and site index and explained 66% of the total variation. Expansion factors decreased from 1.8–2.0 in small trees (dbh < 10 cm) to 1.1–1.2 for large trees (dbh > 25 cm), but differed among species. The overall model explained 86% of the variation and included quadratic mean diameter and dbh.
KW - allometric model
KW - carbon
KW - mixed effect
KW - simultaneous estimation
U2 - 10.1080/02827581.2014.986519
DO - 10.1080/02827581.2014.986519
M3 - Journal article
AN - SCOPUS:84924613675
VL - 30
SP - 135
EP - 153
JO - Scandinavian Journal of Forest Research
JF - Scandinavian Journal of Forest Research
SN - 0282-7581
IS - 2
ER -
ID: 136769693