This book is the only comprehensive summary of natural resources of
Oregon and adds to World Soil Book Series state-level collection.
Due to broad latitudinal and elevation differences, Oregon has an
exceptionally diverse climate, which exerts a major influence on
soil formation. The mean annual temperature in Oregon ranges from 0
DegreesC in the Wallowa and Blue Mountains of northeastern Oregon
to 13 DegreesC in south-central Oregon. The mean annual
precipitation ranges from 175 mm in southeastern Oregon to over
5,000 mm at higher elevations in the Coast Range. The dominant
vegetation type in Oregon is temperate shrublands, followed by
forests dominated by lodgepole pine, Douglas-fir, and mixed
conifers, grasslands, subalpine forests, maritime Sitka
spruce-western hemlock forests, and ponderosa pine-dominated
forests. Oregon is divided into 17 Major Land Resource Areas, the
largest of which include the Malheur High Plateau, the Cascade
Mountains, the Blue Mountain Foothills, and Blue Mountains. The
single most important geologic event in Oregon was the deposition
of Mazama ash 7,700 years by the explosion of Mt. Mazama. Oregon
has soil series representative of 10 orders, 40 suborders, 114
great groups, 389 subgroups, over 1,000 families, and over 1,700
soil series. Mollisols are the dominant order in Oregon, followed
by Aridisols, Inceptisols, Andisols, Ultisols, and Alfisols. Soils
in Oregon are used primarily for forest products, livestock
grazing, agricultural crops, and wildlife management. Key land use
issues in Oregon are climate change; wetland loss; flooding;
landslides; volcanoes, earthquakes, and tsunamis; coastal erosion;
and wildfires.
General
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