Journal of Geophysical Research Biogeosciences,
Год журнала:
2024,
Номер
129(11)
Опубликована: Ноя. 1, 2024
Abstract
Carbon
evasion
from
urban
river
networks
becomes
increasingly
significant
as
urbanization
accelerates.
However,
there
remains
a
limited
understanding
of
the
overall
carbon
emission
impact
integrating
CO
2
and
CH
4
dynamics,
particularly
in
response
to
ecological
restoration
efforts.
In
this
study,
we
investigated
patterns
fluvial
diffusive
fluxes
across
an
network
Wuxi,
China.
Our
results
reveal
that
water
quality
variables,
especially
dissolved
oxygen
(DO)
phosphorus
content,
predominantly
influence
variability
emissions.
These
factors
exhibit
stronger
correlation
with
emissions
compared
,
indicating
net
increase
deteriorates.
Seasonally,
higher
temperatures,
phosphate
levels,
lower
DO
concentrations
lead
increased
during
summer
months.
Spatially,
areas
(averaged
86
mmol
m
−2
d
−1
0.13
)
are
primarily
situated
near
lake
sections
where
improvements
have
been
achieved
through
Cluster
analysis
shows
over
60%
high‐carbon
162
1.21
sites
study
area
undergone
restoration,
suggesting
potential
for
further
reduction
enhanced
practices.
findings
underscore
importance
implementing
strategies
such
nutrient
removal
aeration
oxygenation
within
initiatives.
Effective
matching
holds
mitigating
networks.
Ecological Indicators,
Год журнала:
2023,
Номер
154, С. 110649 - 110649
Опубликована: Июль 19, 2023
Many
recent
studies
have
revealed
that
polluted
rivers
are
emerging
as
potent
emitters
of
greenhouse
gases
(GHGs).
However,
the
scientific
understanding
GHG
emissions
is
still
limited.
The
present
review
aims
to
provide
a
systematic
analysis
from
in
various
eco-regions.
highlighted
high
nutrient
loadings
such
total
nitrogen
(TN),
organic
carbon
(OC),
phosphorous
(TP),
and
anoxic
condition
major
influencing
factors
for
CO2,
N2O,
CH4
emissions.
Moreover,
strong
positive
correlation
trophic
level
index
(TLI)
with
CO2
fluxes
was
observed.
state-of-art
suggested
based
on
land
use
water
quality,
different
vary
considerably.
For
instance,
reported
N2O
ranged
between
0.007
3.721
mmol
m-2d-1
urban-impacted
0.009–0.049
agricultural
rivers.
0.001
458
m-2d-1,
0.05–1.02
1.40–14.30
urban
impacted,
natural
rivers,
respectively.
Further
range
19.94
895
Overall
in-depth
existing
state
art
pollution
(i.e.
eutrophication)
enhances
rivers;
therefore,
incorporating
effective
restoration
measures
can
mitigate
intensity
assist
achieving
sustainable
development
goals
(SDGs).
National Science Review,
Год журнала:
2023,
Номер
11(3)
Опубликована: Ноя. 6, 2023
ABSTRACT
China
is
among
the
top
nitrous
oxide
(N2O)-emitting
countries,
but
existing
national
inventories
do
not
provide
full-scale
emissions
including
both
natural
and
anthropogenic
sources.
We
conducted
a
four-decade
(1980–2020)
of
comprehensive
quantification
Chinese
N2O
inventory
using
empirical
emission
factor
method
for
sources
two
up-to-date
process-based
models
Total
peaked
at
2287.4
(1774.8–2799.9)
Gg
yr−1
in
2018,
agriculture-developed
regions,
like
East,
Northeast,
Central,
were
N2O-emitting
regions.
Agricultural
have
started
to
decrease
after
2016
due
decline
nitrogen
fertilization
applications,
while,
industrial
energetic
been
dramatically
increasing
2005.
from
agriculture,
industry,
energy,
waste
represented
49.3%,
26.4%,
17.5%,
6.7%
2020,
respectively,
which
revealed
that
it
imperative
prioritize
mitigation
energy.
Natural
sources,
dominated
by
forests,
steadily
growing
317.3
(290.3–344.1)
1980
376.2
(335.5–407.2)
2020.
Our
study
produces
Full-scale
Annual
dataset
(FAN2020),
providing
emergent
counting
refine
current
inventories.
