Soils are 3-dimensional bodies that make up natural landscapes.
In addition to the morphological properties used to characterize
soils, soil bodies also have the properties of size and shape. Soil
maps are made in an effort to provide information on the spatial
distribution of different kinds of soils. Soil mappers...
A Land Evaluation and Site Assessment (LESA) Model was
developed for the forested soils of Lane County, in western Oregon,
based on soil potential ratings and indexes of parcel size and
adjacent and surrounding land use conflict. Lane County's economy
is heavily dependent on resource production uses of land for...
Total organic carbon, total nitrogen, microbial respiration and enzyme
activity (β-glucosidase) were measured on several horizons of a Dayton silt loam
(fine, montmorillonitic, mesic, Typic Albaqualf) soil cropped to annual ryegrass
under two straw residue management systems. The study evaluated the effects
of annual burning of straw residues or annual...
Transitional areas between upland and aquatic habitats, commonly known as
wetland, were once viewed as unproductive areas and were drained for farming or
pasture. Wetlands are now accepted as significant ecological resources, and their
protection is a mandate of federal, state, and local land managers. Due to the
diversity of...
The variability of selected physical, chemical, and morphological
soil properties in two landtype mapping units on'the Rogue River National
Forest in southwestern Oregon was studied.
The objectives of the study were (i) to quantify soil variability
in several soil resource inventory mapping units, (ii) to explore methods
of describing soil...
A model was developed that allows potential users to identify
the agricultural suitability of parcels of land in western Oregon.
Literature was reviewed regarding five possible benefits to be
derived from public policies designed to preserve productive agricultural
land. They are (1) the provision of sufficient cropland
to supply the...
The variability in morphologic, chemical, and physical soil
properties within the Willakenzie silty clay loam, 2 to 12 percent
slopes, map unit in Yamhill County, Oregon was measured.
The objectives of the study included (1) describing the frequency
distributions of individual soil properties, (2) measuring the
taxonomic composition of the...
The effects of aspect, canopy, elevation, and season both singly
and in combination on soil temperatures at 50 cm depths were
evaluated.
The objectives of the study were (i) to develop a standard procedure
for obtaining soil temperature data adequate to classify soils
at the family and great group levels,...
This study was undertaken to determine both the amount and the
spatial variability of sand, silt, clay, and six fractions of coarse
fragments in soils representing harsh sites for reforestation. Particle size data were collected because of their direct relationship to
water holding capacity and the plantability and survivability of...