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Temporal changes of forest net primary production and net ecosystem production in west central Canada associated with natural and anthropogenic disturbances

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Temporal variations of net primary production (NPP) and net ecosystem production (NEP) in west central Canadian forests over the period of 1920–1995 and their responses to natural and anthropogenic disturbances were simulated using the Carbon Budget Model of the Canadian Forest Sector (CBM-CFS2). The results show that forest NPP in the region was 215 g C·year–1·m–2 in 1920, varied between 105 and 317 g·C year–1·m–2 depending on ecoclimatic province, but gradually increased to 330 (158 to 395) g C·year–1·m–2 in the early 1980s before declining to 290 (148 to 395) g C·year–1·m–2 by 1995. Forest NEP was estimated to be 53 (–13 to 88) g C·year–1·m–2 in 1920–1924, increased to 75 (5 to 98) g C·year–1·m–2 in 1960, and then declined to 26 (–14 to 53) g C·year–1·m–2 in 1991–1995. Natural disturbances played a greater role than harvest in determining the temporal pattern of forest NPP and NEP during the period because of the larger area affected by natural disturbances. This study also indicated that ignoring disturbances would lead to an overestimation of forest NPP and NEP in ecosystem modeling.

Les variations temporelles de la productivité primaire nette (PPN) et de la productivité nette de l'écosystème (PNE) dans les forêts canadiennes du centre ouest pendant la période entre 1920 et 1995 ainsi que leurs réponses aux perturbations naturelles et anthropogéniques ont été simulées à l'aide du modèle de bilan de carbone du secteur forestier canadien (CBM-CFS2). Les résultats montrent que la PPN forestière dans la région était de 215 g C·an–1·m–2 en 1920 et variait de 105 à 317 g C·an–1·m–2 selon la province écoclimatique mais a augmenté progressivement à 330 (158 à 395) g C·an–1·m–2 au début des années 1980 avant de diminuer à 290 (148 à 395) g C·an–1·m–2 en 1995. La PNE forestière a été estimée à 53 (–13 à 88) g C·an–1·m–2 en 1920–1924, a augmenté jusqu'à 75 (5 à 98) g C·an–1·m–2 en 1960 et a ensuite décliné à 26 (–14 à 53) g C·an–1·m–2 en 1991–1995. Les perturbations naturelles ont joué un plus grand rôle que la récolte pour déterminer le patron temporel des PPN et PNE forestières pendant cette période à cause de la superficie plus importante affectée par les perturbations naturelles. Cette étude a aussi montré que le fait d'ignorer les perturbations amènerait une surestimation des PPN et PNE forestières en modélisant les écosystèmes.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2003

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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