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Mature Oregon white oaks are fire-resistant, and so would not be severely harmed by grass fires of low intensity. Such fires prevented Douglas-fir and most other conifer seedlings from becoming established, allowing bunch grass prairie and oak woodland to persist. Fire also kept oak woodlands on drier soils free of a shrub understory.
In seasonally dry climates oaks are often fire-resistant, particularly in open grasslands, as a grass fire is insufficient to ignite the scattered trees.
Quercus stellata, the post oak or iron oak, is a North American species of oak in the white oak section. It is a slow-growing oak that lives in dry areas on the edges of fields, tops of ridges, and also grows in poor soils, and is resistant to rot, fire, and drought.
Large bur oaks, older than 12 years, [11] are fire-tolerant because of their thick bark. [10] One of the bur oak's most common habitats, especially in Midwestern United States, is the oak savanna, where fires often occurred in early spring or late fall. Without fires, bur oak is often succeeded by other tree and shrub species that are more ...
The same cannot be said for Oregon white oak, which populate traditionally wetter, less fire-prone regions, resulting in the trees having little built-up fire resistance. Because of the lack of fires in these northern regions, white oaks can have the threat of being outgrown by conifers growing in the understory. [citation needed]
Fire-resistant plants suffer little damage during a characteristic fire regime. These include large trees whose flammable parts are high above surface fires. Mature ponderosa pine ( Pinus ponderosa ) is an example of a tree species that suffers little to no crown damage during a low severity fire because it sheds its lower, vulnerable branches ...
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Of the North American red oaks, the northern red oak, Quercus rubra, is highly prized for lumber. [72] [73] The wood is resistant to insect and fungal attack. [74] Wood from Q. robur and Q. petraea was used in Europe for shipbuilding, especially of naval men of war, until the 19th century. [75]