Water,
Год журнала:
2023,
Номер
15(3), С. 498 - 498
Опубликована: Янв. 27, 2023
We
investigated
the
utility
of
using
synchronous
measurements
to
create
nitrogen
(N)
emission
and
retention
maps
agricultural
areas.
Total
N
(TN)
emissions
from
areas
in
three
different
Danish
pilot
catchments
(1800–3737
ha)
within
sub-catchments
(100–1200
were
determined
by
a
source
apportionment
approach.
Intensive
daily
(main
gauging
stations)
fortnightly
(synchronous
monitoring
discharge,
TN,
nitrate-N
(NO3-N)
concentrations
was
conducted
for
two
years.
The
groundwater
calculated
as
difference
between
model-calculated
NO3-N
leaching
fields
emission.
average
annual
amounted
68,
48,
58
kg
N/ha
6,
30,
40
N/ha,
respectively.
catchments,
based
on
either
TN
or
emissions,
26
44%,
44
57%,
93
97%,
respectively,
with
large
variations
main
catchments.
From
this
study,
we
conclude
that
streams
provide
good
opportunity
developing
local
maps.
However,
should
be
used
when
dealing
calculation
at
finer
resolution
scale
100–300
ha
AMBIO,
Год журнала:
2023,
Номер
53(3), С. 452 - 469
Опубликована: Ноя. 16, 2023
Abstract
Eutrophication
assessments
in
water
management
to
quantify
nutrient
loads
and
identify
mitigating
measures
seldom
include
the
contribution
from
horse
facilities.
This
may
be
due
lack
of
appropriate
methods,
limited
resources,
or
belief
that
impact
horses
is
insignificant.
However,
recreational
sector
growing,
predominantly
multi-functional
peri-urban
landscapes.
We
applied
an
ecosystem
approach
facilities
Stockholm
Region,
Sweden.
found
increased
total
with
30–40%
P
20–45%
N,
average
area-specific
1.2
kg
7.6
N
ha
−1
year
.
Identified
local
risk
factors
included
manure
practices,
trampling
severity,
soil
condition
closeness
water.
Comparisons
assessment
methods
showed
literature
standard
values
runoff
sufficient
at
catchment
level,
but
small
more
complex
catchments,
measurements
knowledge
are
needed.
Abstract
The
relative
importance
of
environmental
filtering
and
dispersal
in
structuring
metacommunities
littoral
periphytic
diatoms
was
assessed
within
a
large
lake
(Lake
Ladoga,
north-western
Russia).
We
hypothesized
that
different
diatom
functional
guilds
(high-profile,
low-profile,
motile
planktic)
would
respond
differently
to
spatial
variables,
depending
on
their
mode
attachment
ability.
Guilds
showed
distinct
distributional
patterns
along
gradient
wave-induced
disturbance:
low-profile
dominated
exposed
shorelines
(high
disturbance),
whereas
high-profile
were
more
abundant
coastal
wetlands
(low
disturbance).
Redundancy
analysis
with
variation
partitioning
the
entire
community
revealed
variables
(littoral
geomorphology
water
chemistry)
outperformed
indicating
predominant
role
species
sorting.
When
deconstructed
into
groups,
benthic
(i.e.,
motile)
higher
dependence
factors,
planktic
guild
primarily
predicted
by
factors.
Thus,
taxa
lower
abilities
less
impacted
mass
effects
than
taxa.
Among
guilds,
sensitive
chemistry
compared
diatoms,
suggesting
group-specific
habitat
preference
may
interfere
responses
quality
changes.
Hence,
response
parameters
related
resistance
wave
action.
Overall,
we
concluded
dispersal-related
processes
shaping
metacommunity
resulted
from
combination
strong
geomorphology/water
intermediate
scale
our
study.
Research Square (Research Square),
Год журнала:
2024,
Номер
unknown
Опубликована: Март 5, 2024
Abstract
Phosphorus
(P)
is
often
a
limiting
nutrient
in
freshwaters1
and
oligotrophication
(declining
concentrations),
associated
with
reductions
anthropogenic
loading,
has
occurred
many
locations2,3,4,5.
Here,
we
report
on
persistent
widespread
of
northern
rivers
(56o-66o
N)
that
apparently
unrelated
to
declining
loading.
Over
the
past
forty
years,
P
concentrations
draining
minimally
disturbed
subarctic,
boreal
nemoboreal
Swedish
catchments
have
declined
by
close
50%,
more
rapid
declines
already
poor
locations.
Trends
are
negatively
related
increasing
air
temperature,
pH
alkalinity
calcium
organic
carbon
runoff.
were
strongest
shallow,
soils
lying
above
highest
postglacial
coastline.
Today,
most
study
below
expected
background
(reference)
levels,
suggesting
entering
new
water
quality
regime.
These
ongoing
likely
further
increase
highlight
need
for
surface
management
paradigm
addressing
consequences
scarcity
instead
focusing
solely
actions
targeting
reductions.
The Science of The Total Environment,
Год журнала:
2024,
Номер
955, С. 177261 - 177261
Опубликована: Ноя. 1, 2024
Phosphorus
(P)
is
often
a
limiting
nutrient
in
freshwaters
and
most
management
actions
aim
to
reduce
eutrophication
associated
with
excess
anthropogenic
P
inputs.
Here,
we
report
on
the
opposite
problem,
persistent
widespread
oligotrophication
(i.e.,
declining
concentrations)
northern
rivers
(56
Water,
Год журнала:
2023,
Номер
15(3), С. 498 - 498
Опубликована: Янв. 27, 2023
We
investigated
the
utility
of
using
synchronous
measurements
to
create
nitrogen
(N)
emission
and
retention
maps
agricultural
areas.
Total
N
(TN)
emissions
from
areas
in
three
different
Danish
pilot
catchments
(1800–3737
ha)
within
sub-catchments
(100–1200
were
determined
by
a
source
apportionment
approach.
Intensive
daily
(main
gauging
stations)
fortnightly
(synchronous
monitoring
discharge,
TN,
nitrate-N
(NO3-N)
concentrations
was
conducted
for
two
years.
The
groundwater
calculated
as
difference
between
model-calculated
NO3-N
leaching
fields
emission.
average
annual
amounted
68,
48,
58
kg
N/ha
6,
30,
40
N/ha,
respectively.
catchments,
based
on
either
TN
or
emissions,
26
44%,
44
57%,
93
97%,
respectively,
with
large
variations
main
catchments.
From
this
study,
we
conclude
that
streams
provide
good
opportunity
developing
local
maps.
However,
should
be
used
when
dealing
calculation
at
finer
resolution
scale
100–300
ha
