Manioc : Portail | resultats 21 - 40 pour la recherche: International Association for Energy Economics

Éditeur(s) : HAL CCSD Nature Publishing Group
Résumé : International audience
Forest ecosystems have integral roles in climate stability, biodiversity and economic development. Soil stewardship is essential for sustainable forest management. Organic matter (OM) removal and soil compaction are key disturbances associated with forest harvesting, but their impacts on forest ecosystems are not well understood. Because microbiological processes regulate soil ecology and biogeochemistry, microbial community structure might serve as indicator of forest ecosystem status, revealing changes in nutrient and energy flow patterns before they have irreversible effects on long-term soil productivity. We applied massively parallel pyrosequencing of over 4.6 million ribosomal marker sequences to assess the impact of OM removal and soil compaction on bacterial and fungal communities in a field experiment replicated at six forest sites in British Columbia, Canada. More than a decade after harvesting, diversity and structure of soil bacterial and fungal communities remained significantly altered by harvesting disturbances, with individual taxonomic groups responding differentially to varied levels of the disturbances. Plant symbionts, like ectomycorrhizal fungi, and saprobic taxa, such as ascomycetes and actinomycetes, were among the most sensitive to harvesting disturbances. Given their significant ecological roles in forest development, the fate of these taxa might be critical for sustainability of forest ecosystems. Although abundant bacterial populations were ubiquitous, abundant fungal populations often revealed a patchy distribution, consistent with their higher sensitivity to the examined soil disturbances. These results establish a comprehensive inventory of bacterial and fungal community composition in northern coniferous forests and demonstrate the long-term response of their structure to key disturbances associated with forest harvesting. The ISME Journal (2012) 6, 2199-2218; doi:10.1038/ismej.2012.84; published online 2 August 2012
ISSN: 1751-7362

hal-01546179
https://hal.archives-ouvertes.fr/hal-01546179
DOI : 10.1038/ismej.2012.84

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Etude pratique sur les colonies anciennes et modernes et sur leurs grandes compagnies commerciales
Auteur(s) : Martel, Henri
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Les colonies françaises : un siècle d'expansion coloniale
Auteur(s) : Terrier, Auguste (1873-1932) Dubois, Marcel (1856-1916)
Auteurs secondaires : France. Ministère des colonies (1894-1946)
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Comment j'ai subi quinze ans de bagne
Auteur(s) : Mesclon, Antoine
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Memoria sobre la esclavitud en la isla de Cuba con observaciones sobre los asertos de la prensa inglesa relativos al trafico de esclavos = Slavery in the island of Cuba, with remarks on the statements of the British press relative ot the slave trade
Auteur(s) : Torrente, Mariano (1792-1857)
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Visions de bagne
Auteur(s) : Dhur, Jacques (1865-19..)
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Notes on Haïti, made during a residence in that republic : in two volumes. Volume 2
Auteur(s) : Mackenzie, Charles (1788-1862)
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Contagion du choléra démontrée par l'épidémie de la Guadeloupe : conditions hygiéniques de l'émigration dans les pays chauds et de la colonisation de ces pays, des dangers qu'il y a à méconnaître la contagion du choléra : hygiène des pays chauds
Auteur(s) : Pellarin, Augustin
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Étude sur la guerre hispano-américaine de 1898 : envisagée au point de vue du droit international public
Auteur(s) : Le Fur, Louis (1870-1943)
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Hayti or the black republic
Auteur(s) : Saint-John, Spenser Buckingham (1825-1910 ; Sir)
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