Abstract.
While
reforestation
in
water-limited
areas
has
increased
vegetation
coverage,
an
increasing
number
of
studies
have
reported
that
large-scale
plantations
are
suffering
from
tree
degradation,
which
is
characterized
by
short
trees,
small
size,
and
dieback.
Moreover,
the
changes
hydrological
processes
degraded
trees
within
soil-plant
system
remain
poorly
understood.
Here,
stable
isotope
method
(2H,
18O,
13C)
thermal
dissipation
technique
were
used
to
compare
soil
water
dynamics,
transpiration,
root
uptake
patterns,
intrinsic
water-use
efficiency
(WUEi)
Populus
simonii
under
different
degradation
degrees
(no
ND;
light
LD;
or
severe
SD)
2021
growing
season.
As
intensified,
weight
density
decreased
significantly
(P<0.05)
proportion
shallow
layer
(0–40
cm)
increased.
Influenced
precipitation
recharge,
volumetric
content
(SWC)
did
not
show
significant
differences
(P>0.05)
among
degrees.
The
SWC
middle
(40–80
deep
(80–200
layers
lower
ND
plot
than
LD
SD
plots.
Despite
SWC,
isotopic
characteristics
xylem
similar
ND,
LD,
Although
transpiration
plots
was
reduced
compared
plot,
main
depths
proportions
change.
P.
able
shift
source
process
wetting
drying.
healthy
WUEi
more
sensitive
SWC.
Our
study
shows
although
alleviate
exhaustion
reservoirs
some
extent,
sustainable
development
afforestation
ecosystems
requires
appropriate
stand
management
measures
maintain
balanced
forest-water
relationships.
Agricultural Water Management,
Journal Year:
2024,
Volume and Issue:
296, P. 108799 - 108799
Published: March 28, 2024
Poplar
plantations
play
an
active
role
in
windbreak
and
sand-fixation
timber
production
water-limited
areas,
but
the
large-scale
are
experiencing
degradation,
characterized
by
short
trees,
small
size,
dieback.
Moreover,
potential
impacts
of
plantation
degradation
on
ecohydrological
processes
soil-plant
systems
remain
unclear.
We
continuously
measured
soil
water
content
(SWC),
hydrogen
oxygen
isotopic
compositions
plant
xylem
water,
carbon
leaf,
sap
flow
velocity
poplar
trees
under
various
degraded
(no
degraded,
ND;
lightly
LD;
severely
SD)
during
2021
growing
season
(May–September).
also
investigated
tree
root
at
a
depth
0–200
cm.
Our
results
showed
that
as
intensified,
weight
density
different
depths
decreased
proportion
shallow
layer
(0–40
cm)
increased.
Although
SWC
did
not
change
plantations,
SWCs
middle
(40–80
deep
(80–200
were
higher
LD
SD
than
ND
which
might
be
related
to
reduced
transpiration
plantations.
The
Bayesian
mixing
model
all
can
shift
source
from
layers
process
wetting
drying.
Evidence
leaf
isotopes
suggested
increased
sensitivity
intrinsic
water-use
efficiency
SWC.
findings
demonstrate
normal
growth
is
prone
desiccation
due
high
demand
alleviate
depletion
low
transpiration.
For
rain-fed
proper
thinning
measures
reducing
evaporation
may
necessary
avoid
excess
consumption
soils.
Agronomy,
Journal Year:
2024,
Volume and Issue:
14(3), P. 424 - 424
Published: Feb. 22, 2024
Revealing
the
water
use
pattern
of
plants
influenced
by
coal-mining-caused
land
subsidence
is
crucial
to
understand
plant–water
interactions
and
guide
ecological
restoration.
However,
available
information
on
herbaceous
plants,
dominant
species
in
most
arid
semi-arid
regions
with
abundant
coal
resources,
remains
inadequate.
We
investigated
patterns
Stipa
bungeana
Trin.
measuring
soil
content,
root
distribution,
stable
isotopes
hydrogen
(δ2H)
oxygen
(δ18O)
plant
stem
both
before
after
a
rainfall
event.
The
results
revealed
that
prior
rainfall,
areas
exhibited
low
content
no
discernible
difference
drought.
waters
δ2H
δ18O
were
found
be
more
enriched
at
varying
depths
within
area,
indicating
heightened
level
evaporation.
Both
isotopic
composition
responded
sensitively
primarily
replenishing
shallow
layer
(0–20
cm),
thereby
reflecting
an
infiltration
mode
dominated
piston
flow.
More
seeped
into
deeper
layers
area
compared
non-subsidence
preferential
Before
sources
uptake
consistent
deep
layers,
implying
proportion
gradually
decreased
increasing
depth.
After
differed
slightly
between
two
layers.
dominantly
extracted
greater
than
10
cm
20
cm,
respectively.
system
was
developed
area.
Plant
spatial
distribution
roots,
as
well
post-rainfall
regardless
whether
they
or
not.
Although
affected
transport,
similar
adaptive
growth
through
their
roots
high
adaptability
herbs
such
makes
them
viable
option
for
vegetation
restoration
areas.
This
study
has
significant
implications
evaluating
relationships
due
mining,
providing
fundamental
basis
valuable
reference
management
strategies
regions.
