Agricultural Water Management,
Journal Year:
2023,
Volume and Issue:
279, P. 108206 - 108206
Published: Feb. 2, 2023
Agroforestry
has
been
widely
used
for
the
ecological
restoration
construction
of
semi-arid
regions
Chinese
Loess
Plateau.
Investigating
plant
water
sources
is
crucial
understanding
key
ecohydrological
processes
root
uptake
and
relations
between
coexisting
plants.
Clarifying
use
strategies
can
help
to
assess
sustainability
vegetation
in
agroforestry
systems
provide
references
management.
Thus,
we
investigated
characteristics
plants
an
system
consisting
Platycladus
orientalis,
Prunus
davidiana
Medicago
sativa.
The
δD
δ18O
stem
soil
0–300
cm
layer
were
measured.
MixSIAR
model
proportional
similarity
(PS)
quantify
proportion
absorbed
by
each
hydrological
niche
overlap
results
showed
that
combined
effects
rainfall
recharge
evapotranspiration
(ET)
loss
resulted
a
decrease
content
(SWC)
with
increasing
depth,
SWC
deep
(80–300
cm)
had
minor
variability
(6.1–7.1%)
throughout
study
period.
During
period,
due
desiccation,
P.
M.
sativa
mainly
utilized
from
shallow
(0–80
layers,
contribution
rate
65.4
±
8.3%,
64.9
7.7%
73.0
0.2%,
respectively.
three
relied
on
unstable
(recharged
rainfall)
while
was
consistently
low.
This
implies
less
resistant
drought
stress,
thus
posing
threat
stability
system.
Moreover,
even
July
September
high
agroforestry,
partitioning
among
did
not
increase
increased
ET
loss.
strong
competition
use,
as
indicated
values
(0.69–0.97)
PS.
Overall,
low
ecosystem
stability.
Density
reduction
or
selection
suitable
species
required
achieve
sustainable
restoration.
Proceedings of the National Academy of Sciences,
Journal Year:
2024,
Volume and Issue:
121(15)
Published: April 3, 2024
Soil
moisture
(SM)
is
essential
for
sustaining
services
from
Earth’s
critical
zone,
a
thin-living
skin
spanning
the
canopy
to
groundwater.
In
Anthropocene
epoch,
intensive
afforestation
has
remarkably
contributed
global
greening
and
certain
service
improvements,
often
at
cost
of
reduced
SM.
However,
attributing
response
SM
in
deep
soil
such
human
activities
great
challenge
because
scarcity
long-term
observations.
Here,
we
present
37
y
(1985
2021)
analysis
dynamics
two
scales
across
China’s
monsoon
loess
zone.
Site-scale
data
indicate
that
land-use
conversion
arable
cropland
forest/grassland
caused
an
18%
increase
deficit
over
0
18
m
depth
(
P
<
0.01).
Importantly,
this
intensified
time,
despite
limited
climate
change
influence.
Across
Loess
Plateau,
storage
10
layer
exhibited
significant
decreasing
trend
1985
2021,
with
turning
point
1999
when
starting
afforestation.
Compared
before
1999,
relative
contributions
decline
after
were
−8%
108%,
respectively.
This
emphasizes
pronounced
impacts
intensifying
conversions
as
principal
catalyst
decline.
Such
shifts
total
area
into
at-risk
status,
mainly
semiarid
region,
thereby
threatening
security.
To
mitigate
risk,
future
land
management
policies
should
acknowledge
crucial
role
their
interplay
change.
imperative
ensure
security
sustain
zone
services.
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.
Forest Ecosystems,
Journal Year:
2022,
Volume and Issue:
9, P. 100079 - 100079
Published: Jan. 1, 2022
Afforestation
is
a
common
and
effective
approach
used
for
the
restoration
of
degraded
ecosystems
worldwide.
In
China,
Robinia
pseudoacacia
(RP)
among
main
non-native
tree
species
has
been
widely
planted
in
revegetation
Loess
Plateau.
However,
owing
to
uncertainties
regarding
soil
water
consumption
carbon
sequestration,
it
necessary
assess
suitability
sustainability
R.
restoration.
this
study,
we
aimed
analyse
dynamic
effects
forest
on
storage
(SCS)
(SWS).
Specifically,
investigated
association
between
content
(SWC)
organic
(SOC)
underlying
factors
0–500
cm
profile
10-
50-year-old
chronosequence.
The
results
obtained
indicated
that
dynamics
SWS
SCS
time
scale
could
be
divided
into
an
initial
reduction
phase
(the
20
years
after
afforestation)
subsequent
recovery
(20–50
afforestation).
Compared
with
abandoned
land
(AL),
net
accumulation
was
2.51
Mg·ha−1
at
50
afforestation,
whereas
there
398.76
mm
deficit
SWS.
Additionally,
natural
succession
contributed
continuous
change
stand
structure
(e.g.
vegetation
cover
(VC),
understory
coverage
(UVC),
litter
biomass
(LB)).
These
findings
indicate
increases
sequestration
while
causing
deficit.
Furthermore,
density
(SD)
established
make
predominant
contribution
via
its
altering
vegetation,
soil,
characteristics.
Therefore,
high-density
plantation
forests
Plateau
area
should
appropriately
thinned
reduce
stands
basis
erosion
control
wind
sand
fixation,
so
as
increase
sink
lower
consumption,
thus
realizing
synergistic
development
connotation.
