Energy analysis of poplar production for bioenergy in Sweden
Artikel i vetenskaplig tidskrift, 2018

Poplar (Populus spp.) species are currently not widely grown in Sweden but offer interesting options for future large-scale biomass production for bioenergy. This study assesses the average annual net energy yield and the ratio between the gross energy yield and the total primary energy input for well-managed current commercial poplar production systems in Sweden, with and without fertilization with mineral nitrogen (N). The two systems perform similarly, mainly because the yield response to fertilization is estimated to be small. The average annual net energy yields with and without fertilization are estimated at 190 and 179 GJ ha−1 yr−1, respectively. The corresponding energy ratios are 32 and 34, i.e., the total primary energy inputs correspond to only ca. 3% of the gross energy yield, in both cases. Therefore, improving the net energy yield by increasing the harvest level may be considered the most important objective from an energy performance point of view. To do this, more research is needed in order to develop poplar clones that are better adapted to the Swedish climate and identify in which situations poplar responds well to fertilization. At the same time, by reducing the energy inputs associated with the most fuel-intensive activities (wood-chip transportation, chipping, harvesting, forwarding, and stump lifting), greenhouse gas emissions can be reduced. The results should be interpreted with caution since several parameters, especially the yield response to fertilization and fuel consumption rates, are associated with considerable uncertainties.

Poplar

Energy ratio

Populus spp.

Bioenergy

Energy balance

Energy efficiency

Författare

Maria Nordborg

Chalmers, Rymd-, geo- och miljövetenskap, Fysisk resursteori

Göran Berndes

Chalmers, Rymd-, geo- och miljövetenskap, Fysisk resursteori

Ioannis Dimitriou

Sveriges lantbruksuniversitet (SLU)

Annika Henriksson

Henriksson Salix AB

Blas Mola-Yudego

Itä-Suomen Yliopisto

Sveriges lantbruksuniversitet (SLU)

Håkan Rosenqvist

Sveriges lantbruksuniversitet (SLU)

Biomass and Bioenergy

0961-9534 (ISSN)

Vol. 112 110-120

Drivkrafter

Hållbar utveckling

Ämneskategorier

Förnyelsebar bioenergi

Styrkeområden

Energi

DOI

10.1016/j.biombioe.2018.01.021

Mer information

Senast uppdaterat

2018-04-12