iScience,
Год журнала:
2024,
Номер
28(1), С. 111681 - 111681
Опубликована: Дек. 25, 2024
The
construction
of
dams
to
intercept
natural
rivers
constitutes
the
most
severe
human
activity
influencing
underlying
surface.
This
study
focuses
on
four
cascade
reservoirs
Lancang
River
and
explores
their
impact
migration
organic
matter
in
sediments.
research
reveals
significant
spatial
variations
total
carbon
(TOC)
nitrogen
concentrations
sediments
reservoirs.
isotopes
indicate
that
terrigenous
is
main
source
TOC
sediments,
contributing
an
average
66.80%.
Endogenous
algal-derived
second
source,
between
14.30%
32.91%.
sources
contributed
from
upstream
are
lowest,
ranging
6.36%
15.33%.
Our
demonstrates
may
significantly
alter
processes
material
river
basin
ecosystem,
particularly
large
reservoir
which
increased
more
endogenous
matter.
Ecological Indicators,
Год журнала:
2024,
Номер
166, С. 112511 - 112511
Опубликована: Авг. 20, 2024
Based
on
the
focus
role
of
reservoirs
as
carbon
sources
and
sinks,
this
article
explores
their
impact
global
cycle.
Reservoirs,
which
are
"artificial
lakes"
created
by
human
activities
in
rivers,
reviewed
terms
key
links
cycling
within
reservoir
areas,
influencing
factors,
research
methods
related
to
emissions.
By
reviewing
literature
cycling,
we
elucidate
mechanisms
inputs,
decomposition
transformation,
emissions,
burial,
summarizing
biogeochemical
coupling
processes
dissolved
organic
(DOC),
inorganic
(DIC),
particulate
(POC),
(PIC)
with
hydrological
conditions
nutrients.
The
study
concludes
that
process
is
influenced
characteristics
themselves,
hydrodynamic
conditions,
physicochemical
nutrient
activities.
Additionally,
further
clarify
applications
field
sampling
analysis,
modeling,
remote
sensing
technology,
isotope
techniques
cycling.
In
future,
it
recommended
continue
monitoring
simulating
cycle
a
long-term
large-scale
basis,
deeply
explore
multifactorial
construction
Limnology and Oceanography,
Год журнала:
2023,
Номер
68(8), С. 1775 - 1790
Опубликована: Июнь 26, 2023
Abstract
As
an
important
destination
for
upstream
materials
and
element
accumulation,
lake
sediments
hold
a
multitude
of
contextual
information
about
climatic
changes
anthropogenic
disturbances.
However,
understanding
the
sedimentation
state
to
link
catchment
pressures
biogenic
regime
shifts
remains
challenging.
To
address
this,
research
was
conducted
on
state,
including
dynamics,
drivers,
effects
regimes,
responses
typical
historical
events
using
nine
sediment
cores
from
Dongting
Lake,
China,
global
priority
ecoregion.
Three
transitions
were
distinguished
over
century
(1937,
1968,
1993),
whereby
hydrologic
dynamics
land‐use
in
watershed
direct
drivers
with
relative
contributions
16.30%
14.56%,
respectively.
Lake
organic
matter
inputs
not
only
preceded
elements
at
shift
time
but
also
exhibited
nonlinear
trigger
contents
(
R
2
=
0.47,
p
<
0.01),
which
promoted
increase
burial
rates.
Rate
change
analysis
indicated
that
intensive
human
activities
altered
relationship
between
shift,
thus
revealing
response
catchment.
Pathways
quantified
by
partial
least
squares
path
model
established
attributes
properties
via
state.
Our
findings
revealed
cascading
linkage
among
eco‐surroundings,
states,
shifts.
The
further
provided
insights
into
driver‐response
relationships
lake‐catchment
systems.
