A new high-resolution multi-drought-index dataset for mainland China
Earth system science data,
Год журнала:
2025,
Номер
17(3), С. 837 - 853
Опубликована: Март 5, 2025
Abstract.
Drought
indices
are
crucial
for
assessing
and
managing
water
scarcity
agricultural
risks;
however,
the
lack
of
a
unified
data
foundation
in
existing
datasets
leads
to
inconsistencies
that
challenge
comparability
drought
indices.
This
study
is
dedicated
creating
CHM_Drought,
an
innovative
comprehensive
long-term
meteorological
dataset
with
spatial
resolution
0.1°
collected
from
1961
2022
mainland
China.
It
features
six
pivotal
indices:
standardized
precipitation
index
(SPI),
evapotranspiration
(SPEI),
evaporative
demand
(EDDI),
Palmer
severity
(PDSI),
self-calibrating
(SC-PDSI),
vapor
pressure
deficit
(VPD),
which
SPI,
SPEI,
EDDI
contain
multi-scale
periods
2
weeks
1–12
months.
The
application
high-density
station
complete
framework
starting
basic
elements
(the
China
Hydro-Meteorology
dataset,
CHM).
Demonstrating
its
robustness,
excels
accurately
capturing
events
across
China,
as
evidenced
by
detailed
depiction
summer
Yangtze
River
basin.
In
addition,
evaluate
we
performed
consistency
tests
calculated
based
on
Climatic
Research
Unit
(CRU)
CN05.1
found
all
had
high
overall
2-week-scale
potential
early-warning
roles
monitoring.
Overall,
our
bridges
gap
high-precision
multi-index
CHM-based
ensures
reliability
contributes
enhancing
understanding
patterns
trends
Free
access
can
be
at
https://doi.org/10.5281/zenodo.14634773
(Zhang
Miao,
2025).
Язык: Английский
Climate Variability Modulates the Temporal Stability of Carbon Sequestration by Changing Multiple Facets of Biodiversity in Temperate Forests Across Scales
Global Change Biology,
Год журнала:
2025,
Номер
31(4)
Опубликована: Апрель 1, 2025
ABSTRACT
Climate
variability
poses
a
significant
threat
to
ecosystem
function
and
stability.
Previous
studies
suggest
that
multiple
facets
of
biodiversity
enhance
the
temporal
stability
forest
functioning
through
compensatory
effects.
However,
as
climate
change
intensifies,
two
key
questions
remain
unresolved:
(1)
mechanisms
by
which
different
sustain
carbon
sequestration
across
spatial
scales
(2)
how
influences
at
scales.
In
this
study,
based
on
data
from
262
natural
communities
in
temperate
forests
northeastern
China,
we
aggregated
metacommunities
varying
extents.
Using
ordinary‐least
squares
regression,
examined
relationships
between
(hereafter,
“stability”)
We
then
employed
mixed‐effects
models
assess
influence
biotic
Additionally,
applied
piecewise
structural
equation
modeling
disentangle
among
variability,
biodiversity,
Our
findings
indicate
(taxonomic,
functional,
phylogenetic
diversity)
primarily
insurance
Temperature
was
negatively
correlated
with
all
facets,
declines
were
associated
reduced
Precipitation
contrast,
α
diversity
but
positively
β
facets.
Unexpectedly,
precipitation
exhibited
an
overall
positive
correlation
These
results
increasing
temperature
may
pose
greater
ecosystems
future.
Thus,
preserving
will
be
critical
for
mitigating
adverse
effects
warming.
Furthermore,
impact
cannot
overlooked
arid
semi‐arid
regions.
study
provides
novel
insights
into
conservation
under
global
change.
Язык: Английский
Temporal Precipitation Variation and Leaf Stoichiometric Changes Mediate the Dynamics of Tree Growth Responses to Nitrogen Addition Over Time
Journal of Geophysical Research Biogeosciences,
Год журнала:
2024,
Номер
129(10)
Опубликована: Окт. 1, 2024
Abstract
Nitrogen
(N)
addition
can
stimulate
tree
growth;
however,
the
strength
of
this
growth
effect
usually
changes
over
time
and
factors
underlying
these
responses
are
not
fully
understood.
Based
on
a
decade‐long
N
experiment
(by
adding
0,
20,
50,
100
kg
ha
−1
yr
)
in
boreal
forest,
we
studied
to
explored
potential
role
temporal
precipitation
variation
plant
stoichiometric
mediating
this.
We
found
positive
but
changed
nonlinearly
time.
Annual
was
positively
related
under
high‐level
addition;
hence,
hump‐shape
pattern
contributed
nonlinear
responses.
After
effects
were
accounted
for,
peaked
seventh
year
then
declined
for
all
levels
N.
Later
reductions
could
partly
be
attributed
increased
leaf
N:phosphorus
(P)
ratio
time,
especially
at
higher
rates.
also
an
increase
soil
acid
phosphatase,
labile
occluded
P
fraction,
decreased
resorption
efficiency
with
increasing
rates
during
late
stage
experiment,
suggesting
demand.
Collectively,
our
results
imply
that
nutrient
stoichiometry
cumulative
input
may
limit
stimulation
while
appears
unlikely
modulate
atmospheric
deposition.
Язык: Английский