Enhanced
riverine
nitrogen
(N)
and
phosphorus
(P)
exports
from
anthropogenic
activities
have
substantially
shaped
primary
productivity
in
downstream
waters
induced
harmful
ecosystem
effects.
The
structure
of
nutrient
components
determines
environmental
responses,
which
is
still
largely
unknown.
We
addressed
a
flux
decomposition
technique
to
identify
the
high,
middle,
low
N
P
based
on
event
frequency
analysis.
approach
was
first
used
this
study
apportion
fluxes
into
different
at
multiple
sections
Yangtze
River
China
long-term
daily
fluxes.
Our
results
indicate
that
increasing
trend
upstream
can
be
inverted
by
retention
effect
dams
lakes,
more
significant
for
total
(TP)
its
high
component
than
(TN).
most
considerable
along
river
attributed
Three
Gorges
dam,
has
both
fluxes,
especially
TP.
Nutrient
are
mainly
comprised
flux,
while
middle
dominate
downstream.
Significant
but
uncommon
trends
were
observed
all
river.
Both
medium
percentages
increase
significantly
percentage
decreases,
suggesting
tributaries'
hedging
intensifies
upper
net
change
do
not
coincide
space,
indicating
heterogeneity
between
river’s
source
sink
P.
Knowledge
inconsistent
alteration
should
facilitate
efforts
make
better
measures
mitigate
nutrient-related
problems
River.
Journal of Environmental Sciences,
Год журнала:
2023,
Номер
143, С. 148 - 163
Опубликована: Июль 10, 2023
Rivers
worldwide
are
under
stress
from
eutrophication
and
nitrate
pollution,
but
the
ecological
consequences
overlap
with
climate
change,
resulting
interactions
may
be
unexpected
still
unexplored.
The
Po
River
basin
(northern
Italy)
is
one
of
most
agriculturally
productive
densely
populated
areas
in
Europe.
It
remains
unclear
whether
change
impacts
on
thermal
hydrological
regimes
already
affecting
nutrient
dynamics
transport
to
coastal
areas.
present
work
addresses
long-term
trends
(1992-2020)
nitrogen
phosphorus
export
by
investigating
both
annual
magnitude
seasonal
patterns
their
relationship
water
temperature
discharge
trajectories.
Despite
constant
diffuse
point
sources
basin,
a
marked
decrease
(-20%)
export,
mostly
as
nitrate,
was
recorded
last
decade
compared
1990s,
while
no
significant
downward
trend
observed
for
phosphorus.
has
warmed,
pronounced
signals
summer
(+0.13°C/year)
autumn
(+0.16°C/year),
together
strongest
increase
number
warm
days
(+70%-80%).
An
extended
window
temperatures
persistence
low
flow
periods
likely
create
favorable
conditions
permanent
removal
via
denitrification,
lower
delivery
reactive
sea.
results
show
that
change-driven
warming
enhance
processing
increasing
respiratory
river
metabolism,
thereby
reducing
spring
early
autumn,
when
risk
zones
higher.
Sustainability,
Год журнала:
2023,
Номер
15(23), С. 16316 - 16316
Опубликована: Ноя. 26, 2023
The
main
causes
of
surface
water
pollution
with
phosphate
ions
are
various
human
activities.
Monitoring
the
content
phosphorus
compounds
in
waters
is
important
for
management
bodies.
Phosphorus
an
essential
element
life
flora
and
fauna,
but
excessive
amounts
it
can
have
a
harmful
effect
on
environment.
inflow
into
Styr
River
(Western
Ukraine)
occurs
as
result
discharge
cooling
from
Rivne
NPP’s
system.
This
article
has
three
purposes:
(1)
to
using
1-hydroxyethylidene-1,1-diphosphonic
acid
(HEDP);
(2)
(phosphate
ions,
HEDP,
total
River)
monitored
analyzed,
analysis
quality
river
carried
out
accordance
environmental
standards
zone
influence
NPP;
(3)
terms
content,
River,
after
water,
characterized
“satisfactory”
belongs
Class
III.
A
seasonal
trend
changes
was
found,
concentration
HEDP
depends
technological
dosage
mode
during
corrective
treatment
NPP.
Frontiers in Earth Science,
Год журнала:
2024,
Номер
11
Опубликована: Янв. 9, 2024
Introduction:
Water
is
an
important
ecological
factor,
and
non-point
source
pollution
(NPSP)
seriously
affects
water
security.
In
recent
years,
NPSP
has
affected
security
human
survival
in
China.
Methods:
The
Luhun
Lake
Basin
been
selected
as
example
region
of
Yellow
River
(YRB)
China,
the
trends
impacts
nitrogen
(N)
phosphorus
(P)
quantitatively
evaluated
by
using
geographic
information
system
(GIS),
remote
sensing
(RS)
InVEST
model.
Results:
results
show
that
(1)
arable
land
bodies
decreased,
while
forest
land,
grass
construction
unutilized
increased
20
years.
average
annual
precipitation
from
northeast
to
southwest
years;
(2)
N
P
exports
first
2000–2010
then
decreased
2010–2020,
finally
2000–2020;
(3)
with
increase
precipitation,
2000–2010,
2010–2020
(4)
amount
on
were
more
than
other
use
types.
each
type
all
overall
change
trend
2000–2020.
Discussion:
This
study
demonstrates
how
model
can
be
used
assess
data
scarce
regions.
