International Journal of Environmental Research and Public Health,
Journal Year:
2022,
Volume and Issue:
19(20), P. 13313 - 13313
Published: Oct. 15, 2022
In
this
study,
we
investigated
the
accelerating
pace
of
anthropogenic
land
use
and
cover
change
(LULCC)
disturbance,
which
has
generated
enormous
impacts
on
Crocodile
River.
Spot
images
from
1996,
2009
2022
were
used
to
generate
maps
quantify
changes.
A
supervised
classification
with
maximum
likelihood
classifier
was
classify
images.
Sediment
sources
classified
into
two
sources,
revealed
by
erosional
characteristics
in
catchment.
gamma
spectrometry
detector,
high-purity
germanium
(HPGe)
"Well"
detector
Canberra
inductively
coupled
plasma
mass
(ICP-MS)
for
analysis
samples.
The
results
that
1996-2022,
built-up
areas,
bare
water
bodies
increased
3.48%,
2.47%
1.90%,
respectively.
All
LULCC
classes
annually
except
grassland,
shrunk.
radionuclides
showed
210Pbex
found
be
a
more
effective
tracer
than
137Cs.
balance
model
subsurface
contributed
60%,
while
surface
40%,
sediment
load
river.
This
research
provides
valuable
information
necessary
integrated
catchment
management
policies
future
soil
erosion
adopted.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Nov. 27, 2024
Fish
diversity,
an
important
indicator
of
aquatic
ecosystem
health,
is
declining
due
to
water
pollution,
overfishing,
climate
change,
and
invasive
species.
Effective
surveying
monitoring
are
required
protect
fish
diversity.
Here,
a
high-sensitivity
environmental
DNA
(eDNA)
metabarcoding
technique
was
used
investigate
diversity
in
the
Danjiang
River,
Shaanxi
Province,
China.
In
total,
59
species
were
identified
eight
orders,
19
families,
40
genera.
Cypriniformes
Perciformes
main
groups
survey
area,
while
Cyprinidae
accounted
for
50.85%
total
Rhinogobius
similis
(19%),
Hemibarbus
umbrifer
(11%),
Gnathopogon
herzensteini
(10%),
Triplophysa
stewarti
(8%),
Zacco
platypus
(7%)
dominant
Eight
rare
two
exotic
identified.
Combined
with
analysis
historical
data,
richness
using
eDNA
significantly
higher
than
that
captured
ground
cages.
Temperature,
pH,
oxidation-reduction
potential
factors
affect
spatial
distribution
communities.
These
results
suggest
could
be
new
tool
broad
application
prospects;
however,
local
databases
must
improved.
This
study
provides
theoretical
data
methodological
reference
protecting
managing
Qinling
Mountains.
