The purpose of this study was to determine plant species composition, community structure, successional relationships, vegetational development and plant distributions in estuarine salt marshes on the Pacific Coast of Oregon.
Quadrat and transect samples of plant presence and cover, collected from April 1971 - June 1974, were subjected to phytosociological...
The role of synthesis and degradation in controlling enzyme
concentrations was studied.
Concentrations of chloride and arginine were determined for
blood and liver at various stages of development from the embryo to
the 8 day old chicken. The chloride concentrations were used to
obtain the volume of extracellular blood in...
This study traces the evolution of federal legislation to control water pollution in the period between 1935 and 1965. In this legislative history, the function of interest groups, the actions of congressmen and congressional committees, and the role of the President and the Executive Branch are reviewed. The water pollution...
Previous research has indicated that considerable amounts of finely divided slash accumulate in small mountain streams following timber harvesting. The subsequent biological decomposition of this organic matter can result i.n the reduction of dissolved oxygen (DO) concentration to levels as low as 0.6 ppm. These DO levels are lethal
to...
In 1970 a phytosociological reconnaissance consisting of 135 plots in the Subalpine Meadow Zone was made. These samples were sorted using an association table and several Alpine Zone and very early seral communities were set aside, An additional hundred plots taken by M. J. Hamann were
incorporated with these and...
The objective of this study was to quantitatively describe the intrusion of logging debris into artificial gravel streambeds during conditions of low stream flow with a stable streambed, and begin an
analysis of the effect of high flow and unstable streambeds. This study was initiated because prior studies indicated that...
Increasing demands for water related services of the Columbia River and
its tributaries create conflicts between users During the 1970's the
conflict has centered around three major water uses - irrigation, hydroelectric
power generation, and fisheries. This study analyzes some of
the tradeoffs between upstream depletion of water for irrigation...
Field studies indicate that accumulation of finely divided organic
debris in the channels of mountain streams after clearcutting may be
responsible for subsequent reduction in the dissolved oxygen concentration.
The purpose of this study was to quantify the biochemical
oxygen demand (BOD) of Douglas-fir needles and twigs, western
hemlock needles...
The energy budget of a pumice desert surface was analyzed under
clear skies during early, mid- and late summer periods. The pumice
site is in the semi-arid plateau region of Central Oregon at an elevation
of about 1500 meters. The flat pumice surface is approximately
250 hectares in extent, and...
The oxygen concentration in a stream is an important
parameter of water quality. Changes in oxygen concentrations
can affect various stream organisms including fish.
Foresters have become concerned with predicting the impacts
of forest activities on oxygen levels in streams. Slash,
which accumulates in streams as a result of harvesting...