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The Willamette Valley ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency in the U.S. states of Oregon and Washington. Slightly larger than the Willamette Valley for which it is named, the ecoregion contains fluvial terraces and floodplains of the Willamette River system, scattered hills, buttes, and adjacent foothills. It is distinguished from the neighboring Coast Range, Cascades, and Klamath Mountains ecoregions by lower precipitation, lower elevation, less relief, and a different mosaic of vegetation. Mean annual rainfall is 37 to 60 inches (96 to 152 cm), and summers are generally dry. Historically, the region was covered by rolling prairies, oak savanna, coniferous forests, extensive wetlands, and deciduous riparian forests. Today, it co

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dbo:abstract
  • Les forêts de la vallée de la Willamette forment une écorégion terrestre, définie par le WWF, qui s’étend aux États-Unis dans la vallée de la rivière Willamette et d'une petite partie du bassin du fleuve Columbia. La zone est située dans les États de l'Oregon et de Washington au nord-ouest des États-Unis. Cette écorégion occupe 14 900 km2 d'une zone comprise entre la chaîne côtière de l'Oregon à l'ouest et la chaîne des Cascades à l'est. À la suite du développement de l'agriculture dans la région, une grande partie de la zone a perdu son état naturel initial. Seule une toute petite proportion de la zone a conservé ses zones de prairies couvertes de chênes parsemés. Cette zone était restaurée par des incendies naturels ou causés par les Amérindiens. Mais la suppression de ces incendies fait que les prairies se font coloniser petit à petit par des arbres.La vallée est le seul endroit au monde à accueillir la fleur jaune . Le chêne principal qui pousse dans la région est le chêne de Garry. (fr)
  • The Willamette Valley ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency in the U.S. states of Oregon and Washington. Slightly larger than the Willamette Valley for which it is named, the ecoregion contains fluvial terraces and floodplains of the Willamette River system, scattered hills, buttes, and adjacent foothills. It is distinguished from the neighboring Coast Range, Cascades, and Klamath Mountains ecoregions by lower precipitation, lower elevation, less relief, and a different mosaic of vegetation. Mean annual rainfall is 37 to 60 inches (96 to 152 cm), and summers are generally dry. Historically, the region was covered by rolling prairies, oak savanna, coniferous forests, extensive wetlands, and deciduous riparian forests. Today, it contains the bulk of Oregon's population, industry, commerce, and agriculture. Productive soils and a temperate climate make it one of the most important agricultural areas in Oregon. (en)
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  • Wetlands near Eugene, Oregon (en)
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  • Willamette Valley ecoregion (en)
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  • Willamette Valley (en)
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  • Les forêts de la vallée de la Willamette forment une écorégion terrestre, définie par le WWF, qui s’étend aux États-Unis dans la vallée de la rivière Willamette et d'une petite partie du bassin du fleuve Columbia. La zone est située dans les États de l'Oregon et de Washington au nord-ouest des États-Unis. Cette écorégion occupe 14 900 km2 d'une zone comprise entre la chaîne côtière de l'Oregon à l'ouest et la chaîne des Cascades à l'est. (fr)
  • The Willamette Valley ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency in the U.S. states of Oregon and Washington. Slightly larger than the Willamette Valley for which it is named, the ecoregion contains fluvial terraces and floodplains of the Willamette River system, scattered hills, buttes, and adjacent foothills. It is distinguished from the neighboring Coast Range, Cascades, and Klamath Mountains ecoregions by lower precipitation, lower elevation, less relief, and a different mosaic of vegetation. Mean annual rainfall is 37 to 60 inches (96 to 152 cm), and summers are generally dry. Historically, the region was covered by rolling prairies, oak savanna, coniferous forests, extensive wetlands, and deciduous riparian forests. Today, it co (en)
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  • Forêts de la vallée de la Willamette (fr)
  • Willamette Valley (ecoregion) (en)
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