Ecological Indicators,
Год журнала:
2024,
Номер
159, С. 111680 - 111680
Опубликована: Фев. 1, 2024
Sediment
concentrations
of
rare
earth
elements
(REEs)
can
reflect
aquatic
system
impact
from
anthropogenic
activities,
especially
in
small
lakes
characterized
by
high
sensitivity.
However,
the
literature
on
REEs
sediment
profiles
is
limited,
impeding
a
comprehensive
understanding
historical
influence
activities
urban
environments.
In
this
investigation,
we
examined
spatial
distribution
and
fractionation
sediments
Aha
Lake,
karst
lake.
The
results
reveal
that
average
contents
surface
ranged
76.88
to
181.38
mg/kg.
Light
(LREEs)
comprised
>
80
%
total
almost
all
sediments,
indicating
distinct
enhancement
terrestrial
source
influx
derived
LREE-rich
material.
Negative
Eu
anomalies,
weak
positive
Ce
anomalies
may
be
attributed
oxidizing
conditions.
ΣREEs
display
declining
tendency
lake's
border
its
center,
primarily
influenced
human
activities.
Vertical
distributions
most
core
consistently
vary
with
depth,
showing
decrease
at
10–20
cm
higher
20–30
cm.
Additionally,
UCC-normalized
REE
patterns
are
observed
depths
0–30
reflecting
contemporary
environmental
changes
various
sampling
sites.
coal
mining
content
found
than
development
only.
Moreover,
bivariate
(La/Sm)UCC
-
(La/Yb)UCC
plot
effectively
differentiates
depositional
origin
different
layers
locations,
such
as
those
associated
wastewater
deposition
deposition.
This
study
provides
valuable
insights
into
variations
water
environments
due
utilizing
sensitive
levels
lake
sediments.
Ecological Indicators,
Год журнала:
2023,
Номер
158, С. 111422 - 111422
Опубликована: Дек. 20, 2023
Lake
sediments
serve
as
a
sink
for
trace
elements
and
provide
record
of
watershed
changes
resulting
from
anthropogenic
activities
natural
processes.
In
this
study,
eight
in
the
Aha,
an
urban
lake
Guiyang
City,
Southwest
China,
were
investigated
to
reveal
effects
historical
coal
mining
rapid
urbanization
watershed.
Results
showed
that
median
contents
measured
order
Zn
(220.00
mg/kg)
>
Ni
(98.16
Cr
(70.26
Cu
(66.20
As
(58.14
Co
(41.66
Pb
(28.33
Cd
(1.39
mg/kg).
Except
Pb,
concentrations
Cd,
As,
Zn,
Ni,
Co,
4.64,
2.33,
2.00,
1.92,
1.81,
1.09
times
higher
than
regional
background
values
respectively.
Trace
element
center
significantly
rest
sediment
cores,
relatively
stable
hydrodynamic
processes
region.
Vertical
variation
indicated
fluctuations
intensity
tributaries
effectively
tracked
by
variations
levels
middle
layer
Youyu
River
Baiyan
estuaries.
The
elevated
surface
Jinzhong
estuary
reflected
basin
over
past
20
years.
PMF
analysis
demonstrated
mixture
activities,
Cu,
originated
mining.
This
study
provides
important
information
comprehending
small-scale
lakes
environmental
changes.
Frontiers in Environmental Science,
Год журнала:
2025,
Номер
12
Опубликована: Янв. 15, 2025
Can
the
accelerated
development
of
ecological
civilization
promote
sustainable
green
innovation?This
paper
investigates
effects
demonstration
zones
(ECDZs)
on
innovation
resilience.
Based
a
sample
237
prefecture-level
cities
across
31
provinces
in
China
from
2011
to
2021,
our
double
dual
machine
learning
and
spatial
difference-in-differences
model
indicates
that
ECDZs
significantly
enhance
urban
Our
findings
also
reveal
spillover
effect
ECDZ—the
one
city
improves
resilience
neighboring
cities.
The
reaches
its
maximum
fifth
year.
analysis
underlying
mechanisms
suggests
through
advancement
digitalization,
consciousness,
new
quality
productivity.
We
conduct
an
heterogeneity
based
geographical
locations
levels
policy
support,
results
show
impact
is
mainly
observed
western,
inland,
strongly
policy-supported
regions.
this
study
provide
crucial
insights
valuable
guidance
for
developing
national
environmental
conservation
policies
programs.
