The following report Introduces a documentation scheme for flow
oriented ecosystem models and shows its application to a carbon-water
model developed within the coniferous biome. This documentation scheme
has remained operative through revision of this model and expansion of
It to include nutrient flows. This model and subsequent versions are...
The problem of determining an optimal sequence of decisions in
even-aged stand management is analyzed and solved with an alternative to
the traditional dynamic programming network. The new method is derived
independently from two different approaches to the problem: Network
optimization and generalized LaGrange multipliers. Both derivations are
A complex and sometimes serious problem facing modern day forest
managers is that of estimating and analyzing potential on-site impacts
which result from forest activities. A major type of adverse impact
is man-Initiated forest erosion. This consequence can be substantially
magnified when forest harvest and road activities are implemented in...
There is considerable uncertainty associated with stand
establishment in coastal Oregon. Several species can gain
control of the site depending on stand conditions as well as
management practices. In this study, three cover type
transition models were developed using data from the Siuslaw
National Forest to predict stand establishment patterns...
The study presents two main parts: first, a review
of tropical silviculture and forest management systems
and, second, the investigation of a growth and yield
model which has some potential for application in the
tropical region. The presentation of tropical
silviculture includes: (1) an overview of the biological
Many studies have shown that net primary production in old-growth Douglas-fir/western hemlock forests is lower than in younger forests in similar sites, although the cause is still not clear. One possibility is that overall carbon assimilation, or GPP, is lower in older forests. However, it is difficult to measure GPP...
This thesis is a collection of four submitted manuscripts that present
methods to assist forest ecosystem service managers wanting to develop
operational sampling, monitoring, and production plans for a set of
specific quantifiable ecosystem services, which are formulated as a
series of general multi-objective optimization problems. The problems
Large woody debris recruitment to streams from adjacent riparian forests influences stream
channel morphology, sediment routing, and fish habitat. A mathematical model was developed
to 1) determine whether the trees in a stand adjacent to a stream, upon falling, would provide
large woody debris of a specified size to the...
CONIFER simulates water, carbon, and energy dynamics of a coniferous forest. The model consists of 29 nonlinear difference equations. Measured driving variables include air temperature, dew point temperature, precipitation, solar radiation, and wind speed. Water and energy variables are updated
daily; carbon variables are updated weekly. This report contains a...
CONIFER simulates water, carbon, and energy dynamics of a coniferous forest. The model consists of 29 nonlinear difference equations. Driving variables include air temperature, dew point temperature, precipitation, solar radiation, and wind speed. Water and energy variables are updated daily; carbon variables are updated weekly. This report contains a detailed...