Tawe Natural Resource Management Trial i-Tree Eco Study Crown Copyright: RCAHMW.

Tawe Natural Resource Management Trial i-Tree Eco Study

Crown Copyright: RCAHMW

Tawe i-Tree Eco Study

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Understanding the benefits and ecosystem services trees provide society

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

Trees are powerful and versatile assets


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Natural Resource Management Trial

Catchment Area•Fieldwork undertaken by TACP•Sample area 6,995 ha•A plot every 28 ha•252 plots surveyed





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Tawe’s Urban Forest - Population Highlights

•Canopy Cover - 16% 530,000 trees at 76 per hectare

•Species:1. 12% - Common Alder2. 10% - Goat Willow3. 8% - Downy Birch4. 3% to 6% - 7 other ‘Top 10’ species 5. 38% - Other

•Land-use – 60% Private 40% Public: 1. 30% - Vacant2. 28% - Residential3. 24% - Park (Tawe’s most valuable trees located here) 4. 7% - Commercial5. 7% - Transport

Replacement value (CTLA) (not including ecosystem

services) is £234 millionAmenity value (CAVAT) is £816 million

‘Importance Value’ (Leaf area and Prevalence)

Size Class Distribution (Diameter size classes - DBHacross land-uses)

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POLLUTION REMOVEDAirborne pollutants: 124 tonnes per year removed

•Worth £51,800 per year in damage costs

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RAINFALL INTERCEPTED

252,200 m3 of water per year •Equivalent to £592,900 in sewerage charges

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CARBON REMOVED FROM THE ATMOSPHERE PER YEAR3,700 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 STORED105,000 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

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Risks of Emerging Pests and Disease

Pest / Pathogen Species affected Presence in S. Wales Risk in S. Wales At Risk/%

Acute oak decline OAK Confirmed cases on the Welsh/English border

High 9.4

Asian longhorn beetle

BROADLEAVES None Medium 65.5

Chalara dieback of ash ASH 9 cases in Wales High 6.8

Emerald ash borer ASH None Medium 6.8

Giant polypore OAK, BEECH,CHESTNUT, MT ASH, CHERRY

Common in urban areas High 16.3

Oak processionary moth OAK None Medium 13.5

Phytophthora ramorum OAK, BEECH, CHESTNUT, LARCH

Many cases in S. Wales High 0.6

Phytophthora kernoviae BEECH, HOLLY, OAK 5 locations in S. Wales High 8.6

Phytophthera alni ALDER Heavy losses in parts of Wales

High 15.2

Dothistroma (Red band needle blight) PINE Established in Wales High 6.3

Spruce bark beetle SPRUCE Established in Wales High 0.5

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• Producing the evidence• Publicising and raising awareness • Using the data to influence and action• Delivering benefits to communities

Tawe’s trees provide £1,032,300 of ecosystem services per year

Diolch am WrandoThanks for Listening




Tawe Natural Resource Management Trial i-Tree Eco Study Crown Copyright: RCAHMW.

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