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The 6 cities’ forests
Robert HOSTNIK
Slovenia Forest Service
The comparative analysis of urban forests’ potentials of six largest cities in Slovenia
EMoNFUr LIFE+ project workshop, Ljubljana, May 15th, 2012
Landscape Diversity
Forest Cover
58,5 % of total area
Urban Forest Areas
Urban Forest Areas
Ljubljana
Kranj
Celje
Velenje
Maribor
Novo mesto
Comparitive analysis
• Urban forests of 6 selected cities
• Urban forests vs. forests on local
and regional level
URBAN
PERI-URBAN
LOCAL
REGIONAL
• Data of regular forestry inventory
• Forest stand as basic unit
~ 400 ha of forest area
~ 1.600 ha of forest area
~ 8.100 ha of forest area
~ 89.000 ha of forest area
Research topics
• Urban forest cover
• Urban forest ecosystemsNaturalnessStructure of development phasesTree species diversityGrowing stock and structureStand’s potentials
• Urban forest functions10 social functions4 environmental functions3 productive functions
• Ownershipstructurecharacteristics of private forests
• Legal aspects
Defining research area
CORINE Land Cover (CLC 2006)
Urban level
• min. 90 % of densely populated area
• inclusion of traditional urban forests
Peri-urban level
• 2 kilometres circle around urban area
(1/2 hour walking distance)
Forest Cover
15 %
42 %
49 %
63 %
31 %
42 %
49 %
71 %
10 %
29 %49 %
67 %
13 %
29 %
43 %
49 %
14 %
24 %
42 %
42 %
15 %
22 %
25 %
58 %
Novo mesto
Velenje
Kranj
Celje
Maribor
Ljubljana
Urban level Peri-urban level Local level Regional level
Country’s average
58,5%
Forest cover (in %)
Naturalness
4 categories:• Preserved forests (70%+ site original tree species)
• Changed forests (30 – 69%)
• Strongly changed forests (10 – 29%)
• Altered forests (less than 10 %)
Naturalness – the comparison between current and
potentially natural tree species compositionon particular forest site.
Share of preserved forest stands (in %)
57
63
75
55
16
33
15
35
77
8279
66
18
43
28
35
6
29
2119
24 25
54
70
0
10
20
30
40
50
60
70
80
90
%
Ljubljana Maribor Celje Kranj Velenje Novo mesto
Urban level Peri-urban level Local level Regional level
Forest Development
Phases
Share of older forest development phases (in %)
72 72
68
61
43
51 51
62
7471
6466
89
71
7672
8689
83
70
78
62
57
52
0
10
20
30
40
50
60
70
80
90
%
Ljubljana Maribor Celje Kranj Velenje Novo mesto
Urban level Peri-urban level Local level Regional level
Growing Stock
Growing stock (in m3/ha)
304
266 269 283
303
323
256281 288 265
286
314
399
379369
290 273 278
0
50
100
150
200
250
300
350
400
m3/ha
Ljubljana Maribor Celje Kranj Velenje Novo mesto
Urban level Peri-urban level Local level
Country’s
average276
m3/ha
Big Trees
Share of trees with diameter over 50 cm (in % of growing stock)
22
21
20
18
1920
9 10
12
23
18
1717
15
16
15 14
13
0
5
10
15
20
25
%
Ljubljana Maribor Celje Kranj Velenje Novo mesto
Urban level Peri-urban level Local level
Tree Species
Diversity
Number of tree species in urban forests
34
15
4
36
14
5
38
16
5
37
18
3
30
14
2
29
10
4
Ljubljana Maribor Celje Kranj Velenje Novo mesto
All Minority tree species Introduced tree species
Recreation
Share of forest areas with recreational function (in %)
90
72
85
10
68
37
15
6
95
64
24
11
8994
59
29
98
67
33
23
31
24
913
0
10
20
30
40
50
60
70
80
90
100
%
Ljubljana Maribor Celje Kranj Velenje Novo mesto
Urban level Peri-urban level Local level Regional level
Wood Production
Share of forests with importantwood production function (in %)
0 0
57
93
0 0
99 99
5 4
9496
0 0
98 9698
84
67
83
0 0
99 98
0
10
20
30
40
50
60
70
80
90
100
%
Ljubljana Maribor Celje Kranj Velenje Novo mesto
Urban level Peri-urban level Local level Regional level
Ownership
Share of public forests (in %)
37
18
1212
47
41
16
24
54
16
12
16
30
10
3
11
26
13
8
3
35
18
12
25
0
10
20
30
40
50
60
%
Ljubljana Maribor Celje Kranj Velenje Novo mesto
Urban level Peri-urban level Local level Regional level
Conclusions
Urban forests vs. forests on local & regional level
Differences betwen cities.
Differences:- forest cover- forest functions- ownership
- legal aspects
Similarities:- forest ecosystems’ characteristics
The 6 cities’ forests
Robert HOSTNIK
Slovenia Forest Service
The comparative analysis of urban forests’ potentials of six largest cities in Slovenia
EMoNFUr LIFE+ project workshop, Ljubljana, May 15th, 2012
