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Klimatgasutsläpp från matpotatis

osäkerheter och variationer

Röös, Elin (2009). Klimatgasutsläpp från matpotatis. Uppsala: (NL, NJ) > Dept. of Energy and Technology, Sveriges lantbruksuniversitet. Rapport / Institutionen för energi och teknik, SLU ; 017

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Authors/Creators:Röös, Elin
Title:Klimatgasutsläpp från matpotatis
Subtitle:osäkerheter och variationer
Alternative abstract:

Carbon footprint (CF) has become a hot topic as public awareness of climate change is placing demands on manufacturers to declare the climate impact of their products. Calculating the CF of food products is complex and associated with unavoidable uncertainty due to the inherent variability of natural processes. This study quantifies the uncertainty of a common food product and discusses the results in relation to different types of CF systems for food product labelling.

A detailed life cycle inventory (LCI) with global warming potential (GWP) as the only impact category was performed on King Edward table potatoes grown in the Östergötland region of Sweden. Parameters were described using one probability distribution for spatial and temporal variation and one separate distribution describing measuring/data uncertainty, allowing the effect of parameter resolution on CF uncertainty to be studied. Monte Carlo simulation was used to quantify the overall uncertainty. The influence of individual parameters on the CF was analysed and differences in CF for food products from different production systems, with and without climate impact reduction rules, were simulated.

The potato CF fell in the range 0.10-0.16 kg CO2e per kg potatoes, with 95% certainty for an arbitrary year and field. Emissions of N2O from soil dominated both the emissions and the uncertainty of the CF. Locking the temporal variation to a specific year lowered the uncertainty range by 19%. Parameter collection on a spatial scale of one field did not reduce the uncertainty. The most sensitive parameters were the yield, the soil humus content and the emission factor used for N2O emissions from soil. Potatoes grown according to climate rules lowered the CF by 9% with a probability of 53% for an arbitrary year and field.

The importance of yield, which proved to be the most influential parameter, is a common characteristic of agricultural products in general, since the accumulated emissions from a cultivated area are divided across the yield from that area. Maximising the yield reduces the CF but could have negative impacts on other environmental aspects. The purpose of the CF labelling scheme, together with uncertainty analysis, needs to be considered when determining how the CF should be calculated, as an average or for a specific year, farm, field, region, etc.

The CF of potato calculated for an arbitrary year and field varied between approximately -17% and +30% of the average value with 95% certainty, showing that uncertainty analysis in the design, calculation and evaluation of food product CF labelling schemes is important to ensure fair and effective comparisons

Series Name/Journal:Rapport / Institutionen för energi och teknik, SLU
Year of publishing :2009
Depositing date:29 August 2017
Number of Pages:67
Place of Publication:Uppsala
Publisher:Department of Energy and Technology, Swedish University of Agricultural Sciences
Publication Type:Report
Article category:Other scientific
Full Text Status:Public
Agris subject categories.:E Economics, development, and rural sociology > E10 Agricultural economics and policies
J Handling, transport, storage and protection of agricultural products > J10 Handling, transport, storage and protection of agricultural products
Q Food science > Q01 Food science and technology
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Food Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
Agrovoc terms:potatoes, life cycle analysis, greenhouse gases, climate change, Sweden
Keywords:lca, life cycle assessment, livscykelanalys, potatoes, potatis, uncertainty, osäkerhet
Permanent URL:
ID Code:14063
Faculty:NL - Faculty of Natural Resources and Agricultural Sciences (until 2013)
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: SLUpub Connector
Deposited On:31 Aug 2017 11:46
Metadata Last Modified:08 Sep 2017 11:08

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