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07 - Climate gas emissions from forestry – silvicultural measures about models for allocation

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Presented at

XXV IUFRO WORLD CONGRESS

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Abstract

The Norwegian forest industry is increasingly being requested for environmental documentation, typically Environmental Product Declarations (EPDs). Currently, the environmental documentation is based on aggregated quantities for industrial roundwood and fiber. This implies that wood products in general do not reflect wood species (spurce or pine). It is therefore important to calculate emissions from products from specific wood species. Climate gas emissions from Norwegian forestry activities was previously estimated with 2010 as reference year. Hence, the data used for allocation of wood products can be developed further with respect to different products and with respect to year the data are collected from. The study investigates five relevant scenarios: I) Estimations based on data from single years, II) Estimations based on calculated averages, III) Estimates based on data from when measures actually took place, IV) Sensitivity analysis on effects of fertilization, and V) Estimates based on regional data. Climate gas emissions are within the interval 10,6 til 18,9 GWP/m3. Harvesting, transport to roadside and fertilzation were the measures with the larges impact on emissions. In general, sawlogs from pine had the largest yearly variation in emissions. Furthermore, there is also substantial differences between emissions from aggregated products (i.e. estimated for both pine and spruce) and estimated emissions from specific tree species. The results indicate that results from the five scenarios differ by up to 30 % for single Products.

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