Applied Sciences,
Год журнала:
2023,
Номер
13(20), С. 11607 - 11607
Опубликована: Окт. 23, 2023
Sediment
deposition
is
an
ecological
and
environmental
problem
faced
by
most
water
bodies.
In
view
of
the
poor
structural
stability
unrepeatable
use
existing
permeable
structures,
this
paper
proposes
a
cascade
dam,
which
consists
four
dam
As
composition
material
key
to
sediment
interception
discharge
capacity,
study
sets
up
two
groups
particle
sizes
for
experiments.
The
results
show
that
performance
good.
When
with
small
size
selected,
percentage
intercepted
mass
inside
bodies
75–89%.
rate
much
greater
than
large
size,
tends
decline
one
along
flow
direction.
capacity
gradually
decreases
time,
there
obvious
decrease
in
permeability
coefficient
1#
dam.
provide
programmatic
support
reducing
entering
shallow
lakes
rivers,
can
further
optimize
structure
design
dams.
Microorganisms,
Год журнала:
2024,
Номер
12(2), С. 266 - 266
Опубликована: Янв. 26, 2024
Intensive
aquaculture
in
high-density
hybrid
snakehead
[Channa
maculata
(♀)
×
Channa
argus
(♂)]
fishponds
can
lead
to
toxic
conditions
for
fish.
This
study
investigated
nitrogen
migration
and
transformation
these
during
different
cultivation
periods.
Using
qPCR
technology,
we
analyzed
the
abundance
variation
of
nitrogen-cycling
microorganisms
water
sediment
reveal
metabolism
characteristics
fishponds.
The
results
showed
that
fish
biomass
significantly
impacts
suspended
particulate
matter
(SPM)
flux.
At
sediment–water
interface,
inorganic
fluxes
predominant
NO3−-N
absorption
by
sediments
NH4+-N
NO2−-N
release,
especially
later
stages.
Sediments
were
rich
nirS
AMX
16S
rRNA
genes
(ranging
from
4.04
109
1.01
1010
1.19
108
2.62
copies/g,
respectively)
with
nirS-type
denitrifiers
potentially
dominating
denitrification
process.
Ammonia-oxidizing
bacteria
(AOB)
found
dominate
ammonia
oxidation
process
over
ammonia-oxidizing
archaea
(AOA)
both
sediment.
Redundancy
analysis
revealed
a
positive
correlation
between
SPM
flux,
Chlorophyll
(Chl-a),
water,
NH4+/NO2−
at
interface.
These
findings
provide
scientific
basis
control
