Greenhouse Gas Emissions - Fluxes and Processes: by A. Tremblay, Louis Varfalvy, Charlotte Roehm, Michelle

By A. Tremblay, Louis Varfalvy, Charlotte Roehm, Michelle Garneau

This can be the 1st publication to supply measurements of greenhouse gases from either aquatic and terrestrial environments in addition to from hydroelectric reservoirs. This monograph not just offers the state of the art techniques for measuring the emissions of greenhouse gases, but additionally demonstrates the mechanisms or approaches resulting in the emissions of greenhouse gases. It offers the reader a synthesis of what we comprehend of GHG emission after 12 years of study in boreal ecosystems, the estimations of gross and internet emissions from hydroelectric reservoirs, the influence of hydroelectric reservoirs on weather switch, in addition to a comparability of the several alternatives for generating strength in terms of GHG emissions.

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Extra info for Greenhouse Gas Emissions - Fluxes and Processes: Hydroelectric Reservoirs and Natural Environments

Example text

The short duration of changes is largely due to the fact that only a small portion of flooded organic matter (forest soils, tree branches, trunks and vegetation) is readily and rapidly decomposable in the cold water of boreal reservoirs. Trees branches, trunks and roots, as well as the underlying soil humus, have been found still intact in 60-year-old reservoirs (Van Coillie et al. 1983).

Jour-1pour les lacs naturels. Bien qu’il y ait moins de données disponibles, des tendances similaires ont été observés dans la plupart des réservoirs étudiés dans d’autres régions boréales (Finlande, Colombie-Britannique, Manitoba, Terre-Neuve-Labrador), semi-arides (Arizona, Nouveau-Mexique, Utah) et tropicales (Panama, Brésil, Guyane Française, chapitres 8, 9, 11, 12). Dans les régions tropicales, le temps requis pour un retour à des valeurs naturelles est parfois plus long, dépendamment des conditions de qualité de l’eau.

Les sols organiques (tourbes) qui sont inondés périodiquement ou en permanence contribuent plus activement à la production de méthane que les sols émergés (chapitre 18). Les taux d’oxydation du méthane sont donc plus élevés dans les tourbières exondés que dans les sols forestiers inondés ou dans les sédiments lacustres. Les taux les plus faibles d’oxydation du méthane se rencontrent dans le sol forestier, composé de sols typiques non perturbés, où les taux de production de CH4 sont près des valeurs les plus faibles des réservoirs.

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