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Effects of flooding on photosythesis and root respiration in Saltcedar (tamarix ramosissima), an...
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Effects of flooding on photosythesis and root respiration in Saltcedar (tamarix ramosissima), an invasive riparian shrub
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1852.pdf
Description
Author
Polacik
,
Kristen
Title
Effects
of
flooding
on
photosythesis
and
root
respiration
in
Saltcedar
(tamarix
ramosissima)
, an
invasive
riparian
shrub
Degree Program
Biology
Subject keywords
Tamarix
ramosissima
Lebed.
;
flooding
;
root
alcohol
dehydrogenase
;
photosynthesis
;
δ13C
;
plant
water
potential
;
canopy
cover
Abstract
The
introduced
shrub
Tamarix
ramosissima
Lebed
.
invades
riparian
zones
, but
loses
competitiveness
under
flooding
. This was
tested
in
Tamarix
ramosissima
by
examining
responses
to
flooding
by
soil
type
in a
greenhouse
setting
. A
field
study
examined
responses
of
Tamarix
ramosissima
and
other
species
to
natural
flooding
.
Leaf
level
photosynthesis
rates
,
stomatal
conductance
,
transpiration
, and
root
alcohol
dehydrogenase
(ADH)
activity
were
measured
weekly
to
assess
oxygen
stress
. In the
field
,
stomatal
conductance
,
leaf
water
potential
,
transpiration
,
canopy
cover
, and
δ13C
were
measured
as
responses
to
soil
water
potential
,
soil
moisture
,
Julian
date
,
relative
humidity
, and
water
depth
. In the
greenhouse
study
,
flooding
affected
Tamarix
ramosissima
initially
.
Photosynthesis
rates
within
flooded
plants
ranged
from
7.5
to
14
μmol
CO2
m-2
s-1
during
the
first
two
weeks
, but
increased
to
26.9
to
27
μmol
CO2
m-2
s-1
by the
fourth
week
. As
flooding
progressed
,
photosynthesis
rates
increased
as
plants
became
acclimated
.
Lower
photosynthesis
rates
at the
onset
of
flooding
could
account
for the
susceptibility
of
Tamarix
ramosissima
to
flooding
.
Soil
type
had
no
effect
on
photosynthesis
rates
or on
root
ADH
activity
.
Root
ADH
activity
was
higher
in
flooded
plants
compared
to
drained
plants
,
indicating
oxygen
stress
in
flooded
plants
. The
ability
of
Tamarix
ramosissima
to
acclimate
to
flooding
within
four
weeks
indicated
metabolic
acclimation
. In the
field
study
,
Tamarix
ramosissima
had
lower
stomatal
conductance
and
leaf
water
potential
compared
to
Populus
deltoides
Bartr
. and
Phragmites
australis
(Cav.)
Trin
.
ex
Steud
at
-1.4
MPa
and
1.5
mmol
H2O
m-2
s-1
.
Lower
leaf
water
potential
and
stomatal
conductance
in the
field
can
also
account
for
loss
of
competitiveness
of
Tamarix
ramosissima
under
flooding
.
Typha
angustifolia
L
. had the
highest
canopy
cover
compared
to
Tamarix
ramosissima
,
Melilotus
officinalis
(L.)
Lam.
,
Baccharis
salicina
Torr
.
&
A.
Gray
, and
Saccharum
ravennae
(L.)
L
.
Differences
in
canopy
cover
indicated
Typha
angustifolia
was
more
tolerant
of
flooding
compared
to
Tamarix
ramosissima
.
Nonetheless
,
T
.
ramosissima
is
more
flooding
tolerant
than
previously
realized
.
Differences
in
physiological
responses
for
Tamarix
ramosissima
could
become
important
for
ecological
or
management
concerns
with this
species
.
Date Original
2010
Publisher
Fort Hays State University
Relation
Digital reproduction of the Fort Hays State University Theses Collection.
Type
Text
Format
application/pdf
Identifier
PolacikKristen_2010.pdf
Source
LD2652 .T5 B5 P653 2010
Language
eng
Relation-Requires
Adobe Reader is required to view this item. Download at
http://get.adobe.com/reader/.
Rights
Copyright 2010 Kristen Polacik
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