Transcript Tawe Natural Resource Management Trial i-Tree Eco Study Crown Copyright: RCAHMW Tawe i-Tree Eco Study Understanding the benefits and ecosystem services trees provide society Trees are.

Tawe Natural Resource Management Trial
i-Tree Eco Study
Crown Copyright: RCAHMW
Tawe i-Tree Eco Study
Understanding the benefits and ecosystem services
trees provide society
Trees are powerful and versatile assets
Tawe’s trees provide
£1,032,300 of
ecosystem services
per year
i-Tree Eco measures:
• Rain water intercepted
• Air pollution removed
• Carbon captured and
stored
2
Tawe i-Tree Eco Study
Natural Resource Management
Trial
Catchment Area
Crown Copyright: RCAHMW
•
•
•
•
Fieldwork undertaken by TACP
Sample area 6,995 ha
A plot every 28 ha
252 plots surveyed
Crown Copyright: RCAHMW
Crown Copyright: RCAHMW
Crown Copyright: RCAHMW
3
Tawe i-Tree Eco Study
Tawe’s Urban Forest Population Highlights
Size Class Distribution
(Diameter size classes - DBH
across land-uses)
• Canopy Cover - 16%
530,000 trees at 76 per hectare
• Species:
1.
2.
3.
4.
5.
12% - Common Alder
10% - Goat Willow
8% - Downy Birch
3% to 6% - 7 other ‘Top 10’ species
38% - Other
• Land-use – 60% Private 40% Public:
1.
2.
3.
4.
5.
‘Importance Value’
(Leaf area and Prevalence)
30% - Vacant
28% - Residential
24% - Park (Tawe’s most valuable trees located here)
7% - Commercial
7% - Transport
Replacement value (CTLA) (not including ecosystem
services) is £234 million
Amenity value (CAVAT) is £816
million
4
Tawe i-Tree Eco Study
POLLUTION REMOVED
Airborne pollutants: 124 tonnes per year removed
• Worth £51,800 per year in damage costs
5
Tawe i-Tree Eco Study
RAINFALL INTERCEPTED
252,200 m3 of water per year
• Equivalent to £592,900 in sewerage charges
6
Tawe i-Tree Eco Study
CARBON REMOVED FROM THE ATMOSPHERE PER YEAR
3,700 tonnes carbon per year
• Equivalent to 5,400 cars or 2,200 family homes
Worth £651,000 per year
Ash, Oak and Sycamore are the top performers
CARBON STORED
105,000 tonnes of carbon is stored in Tawe’s trees
• Equates to 130% carbon emissions produced by
Tawe’s households
This amount of carbon is worth £22.6 million
• By 2050 this value will be £48.3 million
Oak and Sycamore are the top performers
7
Tawe i-Tree Eco Study
Risks of Emerging Pests and Disease
Pest / Pathogen
Species affected
Presence in S. Wales
Risk in S. Wales
At Risk/%
High
9.4
Medium
65.5
High
6.8
Medium
6.8
High
16.3
Medium
13.5
Acute oak decline
OAK
Confirmed cases on the
Welsh/English border
Asian longhorn
beetle
Chalara dieback of ash
BROADLEAVES
None
ASH
9 cases in Wales
Emerald ash borer
ASH
None
Giant polypore
OAK, BEECH,CHESTNUT, Common in urban areas
MT ASH, CHERRY
Oak processionary moth
OAK
Phytophthora ramorum
OAK, BEECH, CHESTNUT, Many cases in S. Wales
LARCH
High
0.6
Phytophthora kernoviae
BEECH, HOLLY, OAK
5 locations in S. Wales
High
8.6
Phytophthera alni
ALDER
High
15.2
Dothistroma (Red band needle blight) PINE
Heavy losses in parts of
Wales
Established in Wales
High
6.3
Spruce bark beetle
Established in Wales
High
0.5
SPRUCE
None
8
Tawe i-Tree Eco Study
Tawe’s trees provide
•
•
•
•
£1,032,300 of ecosystem services per year
Producing the evidence
Publicising and raising awareness
Using the data to influence and action
Delivering benefits to communities
9
Tawe i-Tree Eco Study
Diolch am Wrando
Thanks for Listening
Crown Copyright: RCAHMW
Crown Copyright: RCAHMW