Future carbon storage in harvested wood products from Ontario’s Crown forests

نویسندگان

  • Jiaxin Chen
  • Stephen J. Colombo
  • Michael T. Ter-Mikaelian
  • Linda S. Heath
چکیده

This analysis quantifies projected carbon (C) storage in harvested wood products (HWP) from Ontario’s Crown forests. The large-scale forest C budget model, FORCARB-ON, was applied to estimate HWP C stock changes using the production approach defined by the Intergovernmental Panel on Climate Change. Harvested wood volume was converted to C mass and allocated to four HWP end-use categories: in use, landfill, energy, and emission. The redistribution of C over time among HWP end-use categories was calculated using a product age-based C-distribution matrix. Carbon emissions for harvest, transport, and manufacturing, as well as emission reductions from the use of wood in place of other construction materials and fossil fuels were not accounted for. Considering the wood harvested from Ontario Crown forests from 1951 to 2000 and the projected harvest from 2001 to 2100, C storage in HWP in use and in landfills is projected to increase by 3.6 Mt year–1 during 2001–2100, with an additional 1.2 Mt year–1 burned for energy. Annual additions of C projected for HWP far outweighs the annual increase of C storage in Ontario’s Crown forests managed for harvest, which is projected to increase by 0.1 Mt year–1 during the same period. These projections indicate that regulated harvest in Ontario results in a steadily increasing C sink in HWP and forests. Uncertainties in HWP C estimation are also discussed. Résumé : Cette analyse quantifie la séquestration prévue du carbone (C) dans les produits du bois provenant des forêts publiques de l’Ontario. Le modèle de bilan à grande échelle de C de la forêt, FORCARB-ON, a été utilisé pour estimer les changements dans les stocks de carbone associés aux produits du bois à l’aide de l’approche de production définie par le « Intergovernmental Panel on Climate Change ». Le bois récolté a été converti en masse de C et alloué à quatre catégories d’utilisation ultime des produits du bois : en usage, enfouissement, énergie et émission. La redistribution de C dans le temps parmi les catégories d’utilisation ultime des produits du bois a été calculée à l’aide d’une matrice de distribution de C basée sur l’âge des produits. Les émissions de C engendrées par la récolte, le transport et la transformation ainsi que la réduction des émissions due à l’utilisation du bois à la place d’autres matériaux de construction et des combustibles fossiles n’ont pas été comptabilisées. En tenant compte du bois récolté sur les terres publiques de l’Ontario de 1951 à 2000 et de la récolte prévue de 2001 à 2100, la séquestration de C dans les produits du bois en usage et dans les enfouissements devrait augmenter de 3,6 Mt an–1 de 2001 à 2100 et l’utilisation du bois à des fins énergétiques devrait générer 1,2 Mt an–1 de plus. Les prévisions d’ajout annuel de C dans les produits du bois dépassent largement l’augmentation annuelle de la séquestration de C dans les forêts publiques aménagées de l’Ontario qui devrait atteindre 0,1 Mt an–1 pendant la même période. Ces projections indiquent que la récolte réglementée en Ontario se traduit par un puits de C qui augmente régulièrement dans les produits du bois et les forêts. Les incertitudes associées à l’estimation de C dans les produits du bois sont également abordées dans la discussion. [Traduit par la Rédaction]

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تاریخ انتشار 2008