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Phytosociology of the ponderosa pine type on pumice soils in the Upper Williamson River Basin, Klamath County, Oregon

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Title Phytosociology of the ponderosa pine type on pumice soils in the Upper Williamson River Basin, Klamath County, Oregon
Names Volland, Leonard A. (creator)
Poulton, Charles E. (advisor)
Date Issued 1963-05-15 (iso8601)
Note Graduation date: 1963
Abstract The
study
was
conducted
over
approximately
191,000
acres
in
central
Klamath
County,
Oregon.
The
research
had
three
objectives:
first,
to
describe
and
classify
the
seral
and
near-climax
vegetation
by
using
polyclimax
principles;
secondly,
to
determine
the
southern
extension
of
five
plant
associations
and
one
plant
associes
as
previously
described
by
C. T. Dyrness
within
the
Weyerhaeuser
Antelope
Unit;
and
thirdly,
to
determine
the
inherent
variability
of
these
and
other
plant
communities
on
young
pumice
soils
over
various
elevation
and
relief
patterns. The
sampling
was
limited
to
those
soils
derived
from
aerially
deposited
pumice
of
Mt.
Mazama
origin.
These
included
the
widely
distributed
Lapine
soil
series
and
the
less
prevalent
Longbell
and
Shanahan
soil
series.
Their
profiles
are
characterized
by
an
A00,
Al,
AC,
C,
and
D
horizon
sequence.
A
qualitative
reconnaissance
method
permitted
the
gathering
of
vegetation,
soil
and
physiographic
data
from
a
large
number
of
variable-sized
sample
locations.
These
locations
were
statified
to
obtain
a
homogeneous
vegetation-soil
sampling
unit.
The
association
table
was
used
to
synthesize
the
analytical
stand
data
into
units
of
similar
ecology.
The
mechanics
of
association
table
construction
are
described.
The
Pinus
ponderosa/Purshia
tridentata,
the
Pinus
ponderosa/Purshia
tridentata/Festuca
idahoensis,
the
Pinus ponderosa/Purshia
tridentata-Arctostaphylos
parryana
var.
pinetorum,
the
Pinus
ponderosa/Ceanothus velutinus-Purshia
tridentata,
the
Pinus
ponderosa/Arctostaphylos
parryana
var.
pinetorum-Ceanothus
velutinus
and
the
Abies
concolor/Ceanothus
velutinus
association
plus
the
Pinus
ponderosa/Ceanothus
velutinus
associes
are
defined
and
characterized
as
they
occur
in
the
study
area.
Factor
compensation
plays
a
significant
role
in
determining
the
location
of
these
classification
units
since
any
single
plant
community
may
occur
over
several
different
soil
and
physiographic
situations. The
appearance
of
these
associations
over
the
landscape
is
presently
determined
by
the
young
soils
and
the
local
physiographic
features.
Therefore,
their
representative
stands
are
designated
as
edaphic
or
topo-edaphic
climaxes
depending
upon
the
location
of
these
stands
in
relation
to
the
typical
elevational
range
of
the
association.
The
Pinus ponderosa/Ceanothus velutinus
associes
is
considered
to
be
an
early
successional
stage
of
the
Abies
concolor/Ceanothus
velutinus
association
as
evidenced
by
the
rapid
encroachment
in
the
Pinus
ponderosa/Ceanothus
velutinus
understory
of
mesic-tending
tree
and
herbaceous
species.
In
addition,
the
characteristic
species
which
are
common
to
both
communities
express
similar
presence
and
dominance
values,
and
their
physical
environments
are
similar.
Heavy
seed
pressure
from
mesic
species
on
locally
favorable,
micro-environments
permit
fragmentary
expressions
of
the
Abies
concolor/Ceanothus
velutinus
association
to
appear
in
the
adjacent
ecosystems
representative
of
more
xeric-tending
effective
environments.
The
variability
in
the
species'
presence
and
relative
dominance
as
they
occur
among
and
within
ecological
units
can
be
partially
explained
by
the
species'
autecological
requirements
in
relation
to
the
physical
environments
typical
of
each
ecological
unit.
The influence
of
an
effective
environment
upon
some
species
is
reflected
in
the
growth
form,
vigor
and
phenology
of
these
species
and
their
competitive
relationships
to
other
species
in
the
stand.
The
utilization
of
this
ecological
knowledge
is
related
to
the
timber,
range
and
wildlife
resources
of
the
Upper
Williamson
River
Basin.
As
emphasized,
however,
effective
resource
management
is
achieved
only
by
an
understanding
of
the
plant
and
animal
environment,
a
realization
of
the
biological
principles
related
to
these
environments,
and
the
economical
regulation
of
resource
use
within
the
framework
of
these
biological
limitations.
Genre Thesis/Dissertation
Topic Forests and forestry -- Oregon
Identifier http://hdl.handle.net/1957/49110

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