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Quercus garryana is an oak tree species of the Pacific Northwest, with a range stretching from southern California to southwestern British Columbia. [3] It is commonly known as the Garry oak, Oregon white oak or Oregon oak.
Grove of Oregon white oaks near Hillsboro Fall colors in Wilsonville. Historically, the Willamette Valley forests were mostly an oak savanna, tall grasslands with scattered Oregon white oaks (Quercus garryana), and groves of coast Douglas-fir (Pseudotsuga menziesii subsp. menziesii). The river floodplains contained extensive wetlands, stands of ...
The West Rocky Prairie Unit is located near Tenino. The unit is 119.0 acres (48.2 ha) and contains Oregon white oak, Oregon ash, Douglas fir, and maple. In 2023, the WDFW undertook a tree-thinning operation to restore the prairie oak habitat by removing heavy densities of ash, fir, and maple. The project would also overhaul the roads in the parcel.
The Steigerwald Lake National Wildlife Refuge is a 1,049-acre (4.25 km 2; 425 ha) riverine flood plain habitat, semi-permanent wetland on the Columbia River, 10 miles (16 km) east of Vancouver, Washington, with cottonwood-dominated riparian corridors, pastures, and remnant stands of Oregon white oak.
Elevation varies from 2,500 to 5,000 feet (760 to 1,500 m). The dry continental climate supports open woodlands dominated by ponderosa pine and bitterbrush, with some Douglas-fir and Oregon white oak. Fire is an integral part of the ecosystem.
Fields of wildlife food crops are interspersed with Oregon white oak savannah, meandering creeks with bottomland Oregon ash forest, old growth bigleaf maple, and native prairie. Other management goals are to preserve native species and enhance biodiversity including the rare oak savannah, upland prairie, and wet prairie habitats.
The slopes are covered by Oregon white oak woodland, Coast douglas-fir, grand fir, ponderosa pine, pacific madrone, tanoak, and chinquapin, with an understory chaparral community that includes snowberry, salal, Oregon grape, poison oak, oceanspray, and swordfern. Many areas have been converted to pastureland, vineyards, orchards, and row crops.
The Takelma tribe often set fires in the oak savanna and chaparral regions to prevent brush overgrowth, creating foraging areas for animals such as deer and elk. It also prevented large wildfires. [49] Oregon white oak and ponderosa pine are the most common trees found in the region. [50]
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