This
study
assessed
the
growth,
biomass,
and
carbon
storage
potential
of
four
urban
tree
species—Pinus
roxburghii,
Broussonetia
papyrifera,
Jacaranda
mimosifolia,
Eucalyptus
camaldulensis—in
Islamabad's
greenbelts.
Sampling
was
conducted
using
a
quadrat
method,
covering
five
sites
(F-9,
G-8,
H-8,
I-8,
Zero-Point),
with
400
trees
analyzed.
Growth
parameters
such
as
diameter
at
breast
height
(DBH),
height,
aboveground
biomass
(AGB),
density
(ACD),
belowground
(BCD),
basal
area
(BA),
volume
were
measured.
E.
camaldulensis
recorded
highest
AGB
(mean:
2.07
t
ha⁻¹,
range:
0.05–6.54
ha⁻¹),
ACD
971.43
BCD
233.14
along
largest
DBH
47.31
cm)
20.10
m).
B.
papyrifera
showed
significant
potential,
mean
values
373.94
ha⁻¹
89.75
respectively.
In
contrast,
J.
mimosifolia
displayed
lowest
(0.2493
ha⁻¹)
but
considerable
variability,
ranging
from
7.68
to
59.83
cm.
P.
roxburghii
exhibited
moderate
values,
0.45
212.36
ha⁻¹.
Overall,
AGB,
ACD,
across
all
species
0.89
418.73
100.49
respectively,
while
ranged
12.07
154.94
m²
61.84
ha⁻¹).
Statistical
analysis
revealed
positive
correlations
among
DBH,
(p
<
0.05).
The
findings
underscore
most
effective
for
sequestration,
demonstrated
soil
fertility
implications.
Future
research
should
explore
long-term
ecological
impacts
management
strategies
these
in
landscapes.
Forests,
Год журнала:
2025,
Номер
16(1), С. 91 - 91
Опубликована: Янв. 8, 2025
In
recent
decades,
excessive
human
activities
have
led
to
large-scale
rocky
desertification
in
karst
areas.
Vegetation
restoration
is
one
of
the
most
important
ways
control
desertification.
this
study,
vegetation
surveys
were
conducted
on
three
typical
plantations
Jianshui
County,
Yunnan
Province,
a
fault
basin
area,
2016
and
2021.
The
Pinus
massoniana
forest
(PM),
yunnanensis
(PY),
mixed
forests
Quercus
variabilis
(MF).
Plant
diversity
soil
nutrients
compared
during
five-year
period.
This
paper
mainly
draws
following
results:
plant
PM,
PY,
MF
increased.
With
increase
time,
new
species
appeared
tree
layer,
shrub
herb
layer
forests.
Tree
with
smaller
importance
values
gradually
withdrew
from
community.
Patrick
index,
Simpson
Shannon–Wiener
index
increased
significantly.
Pielou
changed
highest
for
PM
PY
There
was
no
significant
difference
layer.
bulk
density
(BD)
decreased.
total
porosity
(TP),
capillary
(CP),
non-capillary
(NCP).
pH
significantly
5.88~6.24
7.24~7.34.
decreased
(p
<
0.05).
contents
nitrogen
(TN)
ammonium
(NH4+-N)
content
nitrate
(NO3−-N)
Total
phosphorus
(TP)
MF.
available
(AP)
general,
physical
chemical
properties
also
been
improved.
results
can
provide
data
support
PLoS ONE,
Год журнала:
2025,
Номер
20(2), С. e0318848 - e0318848
Опубликована: Фев. 12, 2025
Resources
and
Environmental
Carrying
Capacity
(RECC)
is
a
comprehensive
concept
that
encompasses
the
interactions
between
resources,
environment,
human
activities,
serving
as
foundation
for
social
development
strategies.
To
adequately
reflect
this
complex
relationship,
multi-level,
multi-dimensional
evaluation
indicator
system
must
be
developed.
This
paper
constructs
regional
soil
environmental
incorporating
PM2.5
indicators,
which
in
line
with
relevant
protection
policies
planning
orientations
our
country
from
2014
to
2023.
It
analyzes
level
trend
of
RECC
Henan
Province
proposes
measures
effective
management.
The
results
indicate
following:
(1)
demonstrates
downward
trajectory,
marked
by
temporary
fluctuations
over
time.
hit
its
nadir
2019,
subsequently
undergoing
gradual
resurgence;
(2)
Analysis
individual
dimension
indicators
reveals
natural
carrying
capacity
has
declined
medium
relatively
weaker
level.
Meanwhile,
shown
slight
but
generally
remained
stable.
In
contrast,
socio-economic
demonstrated
an
upward
trend,
rising
strong
terms
early
warning
measures,
it
essential
establish
red
zone,
implement
credit
record
accountability
system,
develop
monitoring
database
along
information
technology
platform.
evaluating
across
different
dimensions
holds
significant
reference
value
assessing
similar
regions.
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Март 11, 2025
The
practice
of
directly
applying
unfermented
and
decomposed
organic
matter
to
plants
is
rare
in
the
growth
process
terrestrial
plants.
content
at
discharge
outlet
shrimp
ponds
usually
high.
Therefore,
it
necessary
collect
soil
from
simulate
migration
transformation
pathways
acids
related
metabolic
microorganisms
mangrove
wetlands
through
laboratory
columns
HYDRUS-1D
model.
Results
showed
that
oxalic
acid
remained
relatively
stable
column
different
depths,
citric
settled
downward
along
vertical
direction,
concentration
acetic
depth
range
30–50
cm
increased.
formed
insoluble
or
slightly
soluble
precipitates
form
calcium,
40–50
were
completely
neutralized
on
18th
day.
abundance
acid-producing
Acinetobacter
Johnsonii
increased
during
later
stages
anaerobic
acidification
disappeared
after
addition
Ca(OH)2.
results
simulation
adsorption,
deposition
transport
wetland
poor,
infiltration
modelling
agreement
with
experiments.
