comparability of scots pine biomass functions in baltic ... of... · data for comparison - 39 495...
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Comparability of Scots pine
biomass functions in Baltic
and Nordic countries
Gintaras Kulbokas, Andrius Kuliešis
Lithuanian State Forest Service web: http://www.amvmt.lt
The Nordic-Baltic-EFINORD Co-operation group for forest inventory.
Mariehamn, 02/03 09 2015
Aleksandras Stulginskis University web: http://www.asu.lt
Reliable tree biomass data provided by different
sources is one of the most important prerequisites for:
successful forestry efficiency analysis,
planning of sustainable forest resources use,
comparable carbon budget estimation and monitoring in forest.
The data of study can be used for:
analysis of tree biomass data provided by European NFI (project SC13),
improvement of European Dynamics Model EFDM (SC14, SC15),
development of compatible set of biomass equations (Diabolo Task T2.2)
2
Relevance of aboveground biomass functions
comparability
The goal of the study is
to evaluate the comparability
of Scots pine trees
aboveground biomass
and its components,
estimated by
various tree level functions,
which can be used in NFI of
Nordic and Baltic countries
http://www.eea.europa.eu 3
The goal of study
4
Tree AGB
Aboveground tree biomass structure
used in study
Crown Stem
Stem wood Stem bark Green
branches
Dead
branches
Foliage
(leaves, needles)
Crown Stem
5
Biomass functions used for study
Biomass of
Albrektso
n et al.,
1984
Briggs &
Cunia,
1982 (1)
Briggs &
Cunia,
1983 (2)
Hakkila,
1991
Korhonen &
Maltamo,
1990
Mäkelä &
Vanninen,
1998
Marklund,
1988 (1)
Marklund,
1989 (2)
Miksys et
al., 2007
Repola et
al., 2007 Total
Sweden Finland Finland Finland Finland Finland Sweden Sweden Lithuania Finland
Stem wood SW D, H D D D, H D, H D, H 6
Stem bark SB D, H D, H D D D, H D, H D, H 7
Total stem ST D, H D D, H D, H 4
SST=SW+SB x x x 3
Green branches BR D, H D D, H D D, H D, H 6
Needles NE D, H D D D D D D, H D, H D, H 9
Dead branches DB D D D, H D, H D, H 5
Total crown CR D D, H D D* D, H* D, H 6
SCR=BR+NE+DB x x 2
Total
aboveground AB D D D D, H 4
SAB=ST+CR+DB x x x x 4
Independent variables of functions: D- tree DBH, H- tree height.
SST, SCR, SAB – biomass estimated by summary of separate tree part biomass.
* - total crown biomass was corrected adding biomass of dead branches.
47 various tree level functions (10 publications) from 3 countries were used for study.
Data for comparison - 39 495 Scots pine trees
from 2 500 permanent sample plots
of Lithuanian NFI 2010-2014
Study object – all pine trees in all forest stands of Lithuania
stand area - 2 103 000 ha (34% of country area)
mean growing stock volume in all stands 251 m3/ha
in Scots pine stands 320 m3/ha
share of pine 32,4% of total stand area
36,6% of total growing stock volume
6
The data used for comparison
7
1. Comparison of predicted biomass
for mean tree in Scots pine stands
of Lithuania
Age class* 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Height, m 1.7 7.1 11.2 16.1 18.9 21.5 22.9 23.4 25.0 25.5 25.6 25.7 26.3 26.2
DBH , cm 1.2 8.1 13.0 18.2 19.1 22.2 24.7 25.7 28.5 28.8 30.5 30.9 33.6 34.0
Mean data in Scots pine stands. NFI 2014
* 2 age class consist of 11-21 years old stands
8
The estimation of biomass for mean tree in
Scots pine stands
0
10
20
30
40
50
60
70
80
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Age classes
0
10
20
30
40
Green branches
Needles
0
10
20
Dead branches
Albrektson Briggs, 1 Briggs, 2
Hakkila Mäkelä Marklund, 1
Marklund, 2 Mikšys Repola
0
10
20
30
40
50
60
70
80
90
100
110
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Bio
ma
ss, k
g d
m / t
ree
Age classes
Total crown
biomass
0
100
200
300
400
500
600
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Bio
ma
ss
, k
g d
m / t
ree
Age classes
9
The estimation of biomass for mean tree in
Scots pine stands
0
50
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Stem bark
0
100
200
300
400
500
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Age classes
Stem wood
Total stem
biomass
0
100
200
300
400
500
600
700
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Bio
ma
ss, k
g d
m / t
ree
Age classes
10
The estimation of biomass for mean tree in
Scots pine stands Age class 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Height, m 1.7 7.1 11.2 16.1 18.9 21.5 22.9 23.4 25.0 25.5 25.6 25.7 26.3 26.2
DBH , cm 1.2 8.1 13.0 18.2 19.1 22.2 24.7 25.7 28.5 28.8 30.5 30.9 33.6 34.0
Total aboveground biomass
Selected
functions
2. Loess analysis of differences between
biomass estimations for Scots pine trees
measured in all stands
Selected biomass functions:
Briggs and Cunia, 1982
Korhonen and Maltamo, 1990
Marclund, 1988, 1989
Mikšys et al., 2007
Repola et al., 2007
11
The differences of tree crown biomass predicted by
various functions comparing with LT estimation.
Loess analysis
12
Dif
fere
nc
e, k
g d
m / t
ree
Biomass LT (Mikšys), kg dm / tree
The differences of tree stem biomass predicted by
various functions comparing with LT estimation.
Loess analysis
13
Biomass LT (Mikšys), kg dm / tree
Dif
fere
nc
e, k
g d
m / t
ree
The differences of aboveground tree biomass
predicted by various functions comparing with LT
estimation. Loess analysis
14
Dif
fere
nc
e, k
g d
m / t
ree
Biomass LT (Mikšys), kg dm / tree
The differences of biomass predicted by various
functions comparing with LT estimation
(Loess curves) Green branches Dead branches Needles
Stem bark Stem wood Total aboveground
15
3. Estimation of biomass difference
by DBH, age and site index H100
16
The mean tree biomass differences comparing
with LT estimation by tree DBH
Crown
(needles+branches)
Stem
(bark+wood)
Total aboveground
-100
-80
-60
-40
-20
0
20
40
60
80
100
≤6 6.1--14 14.1--26 26.1--38 38>
Me
an
dif
fere
nce
fro
m L
T
(Mik
šys
), %
-100
-80
-60
-40
-20
0
20
40
60
80
100
≤6 6.1--14 14.1--26 26.1--38 38>
DBH, cm
-100
-80
-60
-40
-20
0
20
40
60
80
100
≤6 6.1--14 14.1--26 26.1--38 38>
Me
an
dif
fere
nce
fro
m L
T
(Mik
šys
), %
DBH, cm
17
The mean tree biomass differences comparing
with LT estimation by tree age
Crown
(needles+branches)
Stem
(bark+wood)
Total aboveground
-50
-40
-30
-20
-10
0
10
20
30
40
50
Mean
dif
fere
nce f
rom
LT
(M
ikšys),
%
Age, years
-50
-40
-30
-20
-10
0
10
20
30
40
50
Mean
dif
fere
nce f
rom
LT
(M
ikšys
), %
-50
-40
-30
-20
-10
0
10
20
30
40
50
Age, years
18
The mean tree biomass differences comparing
with LT estimation by site index H100
Crown
(needles+branches)
Stem
(bark+wood)
Total aboveground
-50
-40
-30
-20
-10
0
10
20
30
40
50
≤20 20.1--25 25.1--30 30>
Dif
fere
nce f
rom
LT
(M
ikšys),
%
-50
-40
-30
-20
-10
0
10
20
30
40
50
≤20 20.1--25 25.1--30 30>
H100, cm
-50
-40
-30
-20
-10
0
10
20
30
40
50
≤20 20.1--25 25.1--30 30>
Dif
fere
nce f
rom
LT
(M
ikšys),
%
H100, cm
19
78 77 76
70
61
55
60
65
70
75
80
85
90
17
15 14
14
11
10
11
12
13
14
15
16
17
18
19
The prediction of total crown and stem biomass
in Lithuania by various functions
Crown biomass Stem biomass
Briggs, 1 Marklund, 1 Marklund, 2
Repola Korhonen Marklund, 1
Marklund, 2 Repola
Mikšys Mikšys
1.96 × standard error
To
tal
bio
mass
, M
t d
m
20
The prediction of total Scots pine tree
aboveground biomass in Lithuania
Total
aboveground
biomass
Briggs, 1
Marklund, 2
Marklund, 1
Repola
93
89
84 81
75
65
70
75
80
85
90
95
100
Mikšys
1.96 × standard error
To
tal
bio
ma
ss,
Mt
dm
21
CONCLUSIONS
Differences of aboveground biomass of Scots pine, predicted
using functions of Briggs and Cunia, 1982; Korhonen and
Maltamo, 1990; Marklund, 1988, 1989; Repola et al., 2007 and
Lithuanian function (Mikšys et al., 2007) do not exceed 20 %.
The least differences of predicted biomass comparing with
predicted by Lithuanian function was received for stem
biomass functions of Marklund, 1989, (1%) and Korhonen and
Maltamo, 1990 (3%), for total aboveground biomass - by
functions of Marklund, 1989 (5%).
The bigger differences in biomass were defined for marginal
values of tree diameters (up to 14 and more than 38 cm) and
ages (up to 40 and more than 120 year).
22
Thank you!