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Mining and Smelting Activities Produce Anomalies in Tree-growth Patterns (Murdochville, Québec).

Aznar, Jean-Christophe; Richer-Laflèche, Marc; Bégin, Christian; Marion, Joëlle (2007). Mining and Smelting Activities Produce Anomalies in Tree-growth Patterns (Murdochville, Québec). Water, Air, and Soil Pollution , vol. 186 , nº 1-4. p. 139-147. DOI: 10.1007/s11270-007-9472-3.

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Résumé

At 94 sites throughout the Gaspésie peninsula, Québec, tree growth patterns and variation in growth rate were examined to determine relationship of tree growth to specific pollutants. Canopy dominant Black Spruce (Picea mariana, (Mill.) BSP) were selected at each site. Basal area increment (BAI) values were derived from increment cores and disks taken at breast height. A sigmoid model (Gompertz) to tree basal area was fitted and used as an estimate of tree growth. The residuals were used in association with other landscape variables to test the hypothesis that the tree-growth was reduced at the vicinity of the Murdochville smelter. Results showed that residuals were well explained by smelter distance, elevation, and slope exposition to the smelter emissions. On the intense activity period, tree growth was reduced within a 25-km radius of the smelter, on slopes exposed to the contaminant flow and located at elevation lower than 580 m. With the interruption of smelting activities, growth was recovered for survival trees.

Type de document: Article
Mots-clés libres: air pollution; basal area increment; Black spruce; dendrochronology; Gaspésie; Gompertz; tree growth; Québec
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 janv. 2021 19:03
Dernière modification: 08 janv. 2021 19:03
URI: http://espace.inrs.ca/id/eprint/10929

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