KEF, Alm.del - 2023-24 - Bilag 202: Uddybende materiale af 7/2-24 fra Mattle ifm. foretræde den 30/11-23 om bytræers bidrag til løsning af byernes klimakriser

Klima-, Energi- og Forsyningsudvalget 2023-24
KEF Alm.del Bilag 202
Offentligt

BYTRÆER

MED SUND VÆKST

kan løse byernes klimakriser

Klimavej med træer

Nye bytræer i belægning

Bevaring af træer i belægning

Høj faglighed og målbare resultater

2024 / 1. udgave

KEF, Alm.del - 2023-24 - Bilag 202: Uddybende materiale af 7/2-24 fra Mattle ifm. foretræde den 30/11-23 om bytræers bidrag til løsning af byernes klimakriser

Bytræer er løsningen

på byernes klimakriser

Hvordan kan vi fremme anvendelsen af én af verdens mest skånsomme, effektive og veldokumenterede

klimateknologier? Træer i byerne kan løse mange udfordringer, hvis de plantes korrekt og får lov til at vokse

sig store. Danmark har i 2023 været præget af oversvømmelser og perioder med tørke. Klimaforandringer,

som fører til, at der bliver installeret og anvendt energikrævende tiltag i byerne. Tiltag som ofte bidrager til

yderligere klimaforandringer.

Hvor effektive er bytræer?

Alder, vilkår og udbytte

Et stort og sundt bytræ kan ...

forsinke og optage/fordampe regnvand

køle omgivelserne og filtrere luften for CO2, partikler og forurening

reducere behovet for køling og opvarmning

fremme menneskers trivsel og give plads til mere biodiversitet

øge værdien af vores bygninger og boliger

10-årigt træ

38 m² kroneareal

Opsamler dette år 88 kg CO2

Indeholder 494 kg CO2

Har behov for >16 m³ jord

Et 80-årigt træ er mere end 100 gange

så effektivt, som et 10-årigt træ.

Men kun hvis det vokser godt, bliver gammelt og stort.

Og det kræver, at træet får plads til både blade og rødder.

Kort sagt: Der skal være god plads under jorden.

50-årigt træ

142 m² kroneareal

Opsamler dette år 967 kg CO2

Indeholder 20.429 kg CO2

Har behov for >61 m³ jord

80-årigt træ

200 m² kroneareal

Opsamler dette år 1.262 kg CO2

Indeholder 55.731 kg CO2

Har behov for >86 m³ jord

”Et træ i optimal vækst vil over 60 år

generere en gennemsnitlig

værditilvækst på 4-7 % årligt”

Kilde: VAT19 og I-Tree

Der er mange faktorer i spil med hensyn til

træers optag af CO2, fordampning og optagelse

af regnvand samt tilvækst. Dels er der forskel på

de enkelte træsorter, og dels er der individuelle

forskelle mellem de enkelte træer afhængigt af, hvor

og hvordan træet er plantet, ligesom træet kan være

mere eller mindre sundt i udgangspunktet.

Et voksested med læ og sol betyder rigtigt meget

for væksthastigheden. Et fritvoksende træ vokser

betydeligt hurtigere i størrelse end et træ i skoven.

I dette materiale er der anvendt resultater og

erfaringer fra flere forskellige regioner i Europa.

Er der ikke angivet andre kilder, henviser grafer

og illustrationer til et asketræ i Danmark, med

en gennemsnitlig massefylde på 570 kg/m³, en

stammeomfangstilvækst på 5 cm/år indtil sæson 45,

hvorefter den falder svagt derfra.

Derudover der er anvendt almindelig geometri og

formler fra f.eks. James Urban ”Up by Roots” for at

synliggøre sammenhænge og erfaringer.

KEF, Alm.del - 2023-24 - Bilag 202: Uddybende materiale af 7/2-24 fra Mattle ifm. foretræde den 30/11-23 om bytræers bidrag til løsning af byernes klimakriser

Et godt fundament

”Det bedste tidspunkt at plante et træ

var for 20 år siden.

Det næstbedste er i dag.”

Kinesisk ordsprog

•

er afgørende for gode vækstbetingelser

For at give bytræer de bedste vækstbetingelser, skal følgende kriterier være opfyldt:

Der skal være god plads til rødderne, og træerne skal plantes i næringsrig jord, der samtidig giver

træet den fornødne stabilitet.

Der skal være god adgang til luft og vand i jorden.

Der skal være et godt plantehul, hvor træets rødder kan udfolde sig. Træet har brug for et rodvolumen

på cirka halvdelen af træets kronevolumen. Dette kan beregnes til ca. 80 m³ tilgængelig plads for et

80-årigt træ.

Når man bygger, er der en

udbredt viden om, at der skal

være en fornuftig sammenhæng

mellem bygningens størrelse og

fundamentet. Et højhus kræver et

stort og stærkt fundament,

for at give styrke og stabilitet.

Det er således "no go" at anvende

et carportfundament til et sådant

højhus.

Rødderne er træernes fundament.

Der er en direkte sammenhæng

mellem et træs størrelse og trivsel,

og den plads rødderne har til

rådighed.

Ønsket om et stort og frodigt træ

med mange års vækst, kræver

et stort og stærkt fundament,

for at give frodighed, styrke og

ikke mindst stabilitet!

Tommelfingerreglen er, at det

kræver 1m³ netto-muldplads under

jorden pr. vækstår for en sund

rodvækst.

Link hertil:

https://edepot.wur.nl/178666

(”The Green City Guidelines”, side 70)

KEF, Alm.del - 2023-24 - Bilag 202: Uddybende materiale af 7/2-24 fra Mattle ifm. foretræde den 30/11-23 om bytræers bidrag til løsning af byernes klimakriser

NOTE this replaces the guidance entitled: Tree Planting in Hard Landscape 2016

INTRODUCTION

This guidance has been developed to help highway engineers, developers, tree officers and

all those designing our urban spaces to make the right decisions in order to include urban

trees in their designs. It provides principles on how to plant and maintain trees in our urban

landscapes

–

our streets, civic spaces and surface car parks.

RETAINING EXISTING TREES

Regler for plantning af træer

skaber resultater

When designing a new development, wherever it is safe and practical, the design should

incorporate existing trees worth retaining into the overall layout to provide a mature and

established character.

Trees within the development site should be assessed in accordance with the

Karlsruhe

City Department

Karlsruhe City Department anbefaler, at der anvendes mindst 80 m³ jord til et egetræ med en højde

på 15 meter. Til et tilsvarende lindetræ anbefales 150 m³ jord, da det er mere pladskrævende, end et

egetræ. Og at et lille træ skal have et plantehul på minimum 12 m³.

Derudover er det vigtigt, at træerne får den rette pleje og vækstbetingelser. På næste side er en

gennemgang af de 8 opmærksomhedspunkter, Karlsruhe arbejder med, for at sikre træernes vækst og

overlevelse. I punkt 1 pointeres det, at vi skal tage hensyn til de forskellige træsorter, så vi planter de

rette træer på de rette steder. Det er i klima- og biodiversitets sammenhæng vigtigt at have så mange

forskellige træsorter i byerne som muligt.

Det bliver også pointeret, at vi skal sørge for den nødvendige vanding af træerne. Og der fortælles om,

hvad træer og anden beplantning gør for dyr, fugle, mennesker og byens værdier.

Links hertil:

https://www.eskp.de/en/climate-change/city-trees-under-stress-9351071/

https://www.eskp.de/en/climate-change/better-care-for-urban-trees-9351072/

I flere europæiske

included

British Standard (BS) 5837: Trees in

for plantning af træer, som sikrer investeringen

recommendations

byer

der vedtaget retningslinjer

relation to design,

demolition

På denne og næste side er

2012. The assessment should cover

for

i bytræerne.

and construction

–

Recommendations

der eksempler til inspiration

their

udviklingen af danske

condition, significance and landscape and environmental value. Categories of A, B and C

retningslinjer.

considered for retention. The BS5837 default tree protection barrier shall be

trees shall be

used to protect all trees agreed for retention during the construction process.

LCC Guidance: Urban Tree Planting

(SC Rev C- Dec 2018)

NOTE this replaces the guidance entitled: Tree Planting in Hard Landscape 2016

INTRODUCTION

This guidance has been developed to help highway engineers, developers, tree officers and

Soil volume requirements are proportional to the mature size of tree species. The source

all

designing

method of calculating soil volumes is the research by Lindsey and Bassuk, (1991) and

thosetheir designs. Iturban spaces to make the rightplant and maintain trees in oururban

Urban

our provides principles on how to decisions in order to include urban

trees in

landscapes

(1992). This calculation is based on the potential crown projection combined with nutritional

–

our streets, civic spaces and surface car parks.

RETAINING

and water requirements to produce a specific volume of soil. Crown projection is equivalent to

EXISTING TREES

the area under the tree’s drip line.

When designing a new development, wherever it is safe and practical, the design should

SOIL VOLUMES – calculations (for both Hard/Soft situations)

Adequate soil volume is one of the most critical aspects of the design

Formula

Imperial: 2cubic feet of soil /1 square foot of crown area (applicable to UK)

Metric:

0.6 cubic metres of soil/ 1 square metre of crown area

incorporate existing trees worth retaining into the overall layout to provide a mature and

established character.

Projected mature canopy area (square metres) can be calculated from the radius using the

SOIL VOLUMES – calculations (for both Hard/Soft situations)

Adequate soil volume is one of the most critical aspects of the design

formula

(A=πr2).

Worked example:

Soil volume requirements are proportional to the mature size of tree species. The source

method of calculating soil volumes is the research by Lindsey and Bassuk, (1991) and Urban

Projected Mature Canopy Diameter (metres)

=8(Diameter) 4m radius

(1992). This calculation is based on the potential crown projection combined with nutritional

and water requirements to produce a specific volume of soil. Crown projection is equivalent to

Projected Mature Canopy (square metres)

(A=πr2)

=50 (Area)

the area under the tree’s drip line.

Target Soil Volume (cubic metres), (Area

from Development to Trees” tree dimensions tables for ultimate

=30 (Volume)

Also refer to LCC guidance “Guideline Distances

x 0.6m)

Target soil requirements can be simplified by dividing mature canopy sizes into 4 categories

anbefaler,

from the radius

based

this formula does

Bassuk formula

NOTE-

on the Lindsey and

not apply to

fastigiated and columnar

habit trees. The

Projected mature canopy area (square metres) can be calculated

at der

using the

soil volume

formula

(A=πr2).

MATURE CANOPY

CANOPY AREA

TARGET SOIL VOLUME

requirements can be calculated for narrow trees by basing the canopy diameter on the

example:

anvendes mindst 30

Worked

Projected Mature Canopy Diameter (metres)

=8(Diameter) 4m radius

natural growth form i.e. the widest spread of that particular species

Projected Mature Canopy (square metres)

(A=πr2)

=50

til et

surfaces

LARGE (8m

dia+)

In addition, that input must be distributed evenly across the

Target Soil Volume (cubic metres), (Area

m³ jord

=30 (Area)

træ med et

(not carriageways).

x 0.6m)

(Volume)

50m2

30m3

Rooting Zone.

breakdown of the soil volume provision with calculations shall be submitted to support proposals.

NOTE: a full

(5m -8m dia)

MEDIUM

19.6m2

12m3

(11.8m3)

soil requirements can be simplified

kroneareal på

into 4 categories

Target

by dividing mature canopy sizes

Volume cannot

(3m

achieved by providing extra depth. The maximum useful depth of

soil

(BS 3882)

based

tree

Lindsey and Bassuk formula

SMALL

-5m dia)

7.1m2

5 m3

input

MATURE

the

(4.24m3)

for

CANOPY

50 m². De

TARGET SOIL VOLUME

AREA

skelner

Full hydraulic and water quality design calculations must be

typically concentrated within the uppermost

planting is 900mm. BS5837 states that the root system

of a tree

undertaken for larger

SMALL to Medium

ability to direct water from surrounding pavements to Rooting

8.5m3

600mm of the soil.

volumes. Notwithstanding the

LARGE (8m

dia+)

50m2

30m3

MEDIUM (5m -8m dia)

Zones, permeable or semi-permeable surfacing must be provided over a minimum of 70% of

SMALL (3m -5m dia)

Trees planted in

Rooting Zone in

of soil than that calculated will

Surfaces

their full potential

the top area of each

a lower volume

new streets and parking spaces.

not reach

must be set

SMALL to Medium

and have a shorten life span. A lower

a gully if infiltration

to falls so that run-off will drain positively to

soil volume will not

fails.

accepted unless there is an

Trees within the development site should be assessed in accordance with the

recommendations included in British Standard (BS) 5837: Trees in relation to design,

demolition and construction

–

Recommendations 2012. The assessment should cover their

condition, significance and landscape and environmental value. Categories of A, B and C

trees shall be considered for retention. The BS5837 default tree protection barrier shall be

used to protect all trees agreed for retention during the construction process.

Leeds City

Council:

Leeds City Council

tree heights and spreads

Formula

Imperial: 2cubic feet of soil /1 square foot of crown area (applicable to UK)

Metric:

0.6 cubic metres of soil/ 1 square metre of crown area

overriding

justification/ special circumstances

SuDS

Rooting Zones may be used as part of sustainable urban drainage best practice management

soil

NOTE- A design solution can provide for roots to extend beyond the pit into adjacent

systems

–

e.g.

into grass verges, gardens etc. which can count towards soil volume provision.

areas,

including for water quality treatment of surface water run-off from pavements. Tree

pits can help

connections

rates

be achieved through the

infiltration and/or by

zones” also known as

Physical

reduce flow

can

from a site by facilitating

use of “break out

providing

attenuation storage.

Refer to: The SuDS Manual (C753) 2015 - chapter 19

“root paths”

SUMMARY OF REQUIREMENTS (Hard Landscape situation)

NOTE- If load bearing soil environment systems are being used then it is advisable to

arrange them in corridors/ continuous trenches so that multiple trees can share them. The

•

A named proprietary

on a regular

paving over extended sub-surface

All trees should be

volume

soil cell structures to support

reduced by

and

to 25% in this situation. This

required rooting

checked

for each tree

basis

then be

can

for mammal, human

other external

rooting areas

action should be implemented as soon as practicable following discovery.

damage. Remedial

apply if trees share a very wide unpaved continuous soft Primary Rooting

same discount can

•

Soil cell volume /soil volume calculations

Zone such as a road verge.

mellem forskellige

19.6m2

12m3

(11.8m3)

7.1m2

5 m3

(4.24m3)

størrelser udvoksede

8.5m3

træer, beskrevet efter

kronearealet.

NOTE: Sand-based substrates (also referred to as tree soil/ Amsterdam tree soil)

are not

TREE SELECTION and PLANTING

accepted for the following reasons. These soils are not

Environment

to root growth. High levels

conducive

& Design Group

of compaction are required and low levels of organic

Planning Enquiry Centre, telephone:

the subsequent need for

matter present (

with

(0113)

378 6012

Tree selection

E-mail: landscape.planning @leeds.gov.uk

regular soil management)

. There are risks from over compaction and requirements for automatic

www.leeds.gov.uk/planning

Subject to site constraints there is a presumption in favour of large canopy trees. Large,

irrigation due to low water holding characteristics.

mature trees are the most valuable and have the greatest landscape impact. The developer

shall design for the largest,

aggregate and the stone skeleton substrates typically only have 10-

NOTE: medium- sized

longest lived species suitable for the given space.

All trees should be

of topsoil including additives

for pests and diseases. Remedial action

•

specification

checked on a regular basis

and conditioners

should be

grilles

promptly on discovery, where

means of anchoring root balls. Built-in Root

•

Tree

taken

and guards (if required) and

necessary.

TREES IN

Pipe system with end cap and aeration system.

HARD LANDSCAPE

Irrigation

Unless specific nutritional deficiencies

including directed

fertilizer

grey water

applied to newly

•

Passive and / or active irrigation

are identified, no

use of

should be

/ roofwater or

surface

in the first season.

the required

areas. Details of distribution system and

Hard Landscape situation

planted trees

water infiltration to benefit planted

soil volume/root growing environment for trees will

be provided through the use of underground load bearing root zone technology. These

controls

NOTE-

If visual

into three Categories that are supported by Leeds City Council:

broadly fall

inspection reveals symptoms of nutrient deficiency such as leaf scorching, pale foliage

•

Drainage system for tree pits.

necrotic spots, then further investigation will be necessary with remedial action taken. Remedial action may, in

•

Where applicable -details of protection measures for statutory utilities

of compaction.

addition to fertilizer application, include pH testing, assessment of organic content and levels

and drainage

–

Structural growing

media

(exclusive

the

tree sand

zone structures,

soil)

•

a brief report on the installation of

rooting

/Amsterdam tree

including supporting

–

Crate systems/cell systems e.g. SilvaCells,

still “open” to allow inspection prior to any

References

photographic evidence, when the works are

Root Space, Stratacells etc

•

surfacing works

Trees from Nursery to Independence

BS 8545 2014

•

more information- these techniques are extensively reviewed in the free download

2014)

For

Tdag- Trees In Hard Landscapes (September

(in accordance with BS 8545-2014 Trees

•

3 year irrigation programme for the trees

•

The SuDS Manual (C753) 2015

document

Trees

to Independence)

from Nursery

in Hard Landscape: a Guide for Delivery

by TDAG –

http://www.tdag.org.uk/trees-in-hard-landscapes.html

a quarterly basis for the full 3

•

Confirmation of irrigation compliance shall be submitted

year programme period

Et lille til medium træ

skal helst have 8,5 m³

netto jordvolumen.

De fremhæver mulig-

heden for at tillade

trærødderne i at vokse

ud i den omgivende

jord, hvor der er plads

fremover i tid. Desuden

har de en række for-

hold, der skal tages

hensyn til, når de

planter i byen.

Link hertil:

https://www.leeds.gov.

uk/docs/Guidance%20

Urban%20Tree%20

Planting.pdf

The root space for urban

trees is often restricted by

surrounding buildings and

underground infrastructure.

The graphic shows that the

demands of the individual

tree species on root space

are very different.

(Illustration: Wissensplattform

Erde und Umwelt, eskp.de,

Licence: CC BY 4.0)

Ultimate Mature height

Designers should therefore take

Small

–

to approximately 10 metres

care to ensure that each tree has sufficient volume of

25% void space to support root growth (and to possibly accommodate surface water runoff).

growing medium for its lifespan. Growth is limited by the net soil volume rather than the total

KEF, Alm.del - 2023-24 - Bilag 202: Uddybende materiale af 7/2-24 fra Mattle ifm. foretræde den 30/11-23 om bytræers bidrag til løsning af byernes klimakriser

Street Tree Co

8 vigtige punkter

for succes med bytræer

space and forestry authorities

Recommendations for municipal green

Dr. Somid Saha, Karlsruher Institute of Technology KIT, Institute for Technology Assessment and Systems Analysis ITAS

Hvad er bytræer værd?

For os og miljøet

Planter vi vores bytræer med det formål, at de vokser optimalt og derved danner mest muligt træ-

masse og løv, kan vi anvende deres potentiale fuldt ud til glæde for byen.

Bytræer er med til at binde CO

, støv og forurenende partikler - og så danner de O

Gennem fordampning sænker de temperaturen i byens varmeøer, hvilket er med til at mindske

påvirkningen af klimaforandringer i og omkring byerne.

Trees are

Saha,

only dying because

Technology KIT, Institute for Technology Assessment and Systems Analysis ITAS

Dr. Somid

not

Karlsruher Institute of

of drought and heat-

wave but also because of improper management. Pre-

cise and evidence-based recommendations are being

Trees are not onlythe framework of the „Green Lungs“

developed within dying because of drought and heat-

wave but also because of improper management. Pre-

project. For

Dr. Somid Saha

(KIT), important options

cise and evidence-based recommendations are being

for action are already at hand today:

developed within the framework of the „Green Lungs“

project. For

Dr. Somid Saha

(KIT), important options

1. Species matters:

for action are already at hand today: the right places.

Please select the right species for

Selection of drought-tolerant broadleaf species should

1. Species matters:

also experiment with drought-

be preferred. Please

Please select the right and Central Asianright places.

tolerant Mediterranean species for the species with

Selection of on invasiveness. broadleaf species should

proper care drought-tolerant

be preferred. Please also experiment with drought-

tolerant Mediterranean and Central Asian species with

2. Rooting area:

proper care on invasiveness. because of too little roo-

Many urban trees are dying

ting space given to them. Low water holding capacity

the soil or substrate is killing the trees during drought

Rooting area:

Many urban trees are dying because of too little roo-

and heatwaves. This must be improved.

ting space given to them. Low water holding capacity

of the soil or

matter:

is killing the trees during drought

3. Varieties

substrate

and heatwaves. This must be improved. breeding and

Germany is historically famous for tree

creation of new tree varieties. However, this tradition

being eroded under the era of mass propagation of

Varieties matter:

Germany isGerman foresters and tree breeding and

seedlings. historically famous for gardeners should

creation of new treeto create more drought tradition

revitalize this field varieties. However, this tolerant

is being eroded under the era breeding propagation of

varieties for urban planting by of mass native species.

Graphic: Earth System Knowledge Platform ESKP

seedlings. German foresters and gardeners should

revitalize this field to create more drought tolerant

7. New building projects:

4. Irrigation:

varieties for urban planting by breeding native species.

Graphic: Earth System Knowledge

planning of

Inclusion of urban trees and forests in the

Platform ESKP

We need to develop species-, size-, and site-specific

future and smart cities: There is an urgent need for

irrigation techniques.

7. New building projects:

forests in the future plan-

4. Irrigation:

inclusion of urban trees and

Inclusion ofcities. The city administrations planning of

We need to develop species-, size-, and site-specific

ning of the urban trees and forests in the are already

5. Stop monoculture:

future of it. However, it should also become a mandato-

irrigation techniques. that one street is often planted

aware and smart cities: There is an urgent need for

Most of us will notice

inclusion of urban trees and forests in the future plan-

ry part of urban planning.

with one species. This increases risks of dieback in ur-

ning of the cities. The city administrations are already

5. Stop monoculture:

and gardeners should increase

ban areas. Foresters

aware of it. However, it should also become a mandato-

Most of us will tree speciesone street is often planted

8. Talk to people:

the diversity of notice that in urban areas.

ry part of urban planning.

with one species. This increases risks of dieback in ur-

City administrators and elected councilors should talk

ban areas. Foresters and gardeners should increase

more with people on the issue of the importance of

6. Training:

8. Talk

green space. A high portion of urban green space

the diversity of tree species in urban areas.

urban

to people:

Many workers in urban garden and forest departments

City administratorsWe need to increase theshould talk

is privately owned. and elected councilors awareness

lack training on the need of climate change adaptation

more with people on the issue of the importance of

6. Training:

of people so that we can also secure and sustain urban

in daily management of urban trees and forests. As a

urban areas in private places.

Many workers in urban garden and forest departments

green green space. A high portion of urban green space

result, mistakes (e.g. wrong selection of species) are

is privately owned. We need to increase the awareness

lack trainingrepeatedly. Itof climate change adaptation

being done on the need increases tree mortality and

of people so that we can also secure and sustain urban

in daily management of urban trees and forests. As a

also wastes time and public money. I suggest that a

green areas in private places.

result, mistakes (e.g. trainingselection should be initi-

thorough nationwide wrong program of species) are

being done federal and state governments for the wor-

ated by the repeatedly. It increases tree mortality and

also wastes timegarden and forestry Idepartments of

kers involved in and public money. suggest that a

thorough nationwide training program should be initi-

the cities.

ated by the federal and state governments for the wor-

kers involved in garden and forestry departments of

the cities.

CC BY 4.0, Earth System Knowledge Platform | eskp.de, Potsdam 2019

https://www.eskp.de/en/climate-change/better-care-for-urban-trees-9351072/

CC BY 4.0, Earth System Knowledge Platform | eskp.de, Potsdam 2019

https://www.eskp.de/en/climate-change/better-care-for-urban-trees-9351072/

Recommendations for municipal green space and forestry authorities

Træernes mulige potentiale for byerne

100%

80%

60%

40%

20%

Standard Bytræer:

•

Plantet i netto muld-

volumen ca 3-6m³.

•

Træets kronediame-

ter ca 5m

•

Træet har vokset i

7-12 år og skal ud-

skiftes

•

Ca 5% af det mulige

potentiale

•

Negativ værdi til-

vækst for byen

Skovfogedens Bytræer:

•

Plantet i netto muld-

volumen ca 35m³

•

Træets kronediame-

ter ca 10m

•

Træet har vokset i

40-50 år med plads

til flere år

•

Ca 20-30% af det

mulige potentiale

•

Værdi tilvækst for

byen ligger på 4-7%

årligt

Alder 0

100

110

120

130

140

150

Urban Heat Island i København.

Skovfogedens Bytræer

Standard

Bytræer

Træernes mulige potentiale for byerne

Bytræets værdi ...

•

Netto muldvolumen ca 6m³, efter J.Urban

Kronediameter ca 5m

Vokset i 10 år

Ca 5% af muligt potentiale

BIORETENTION

(NEDSIVNING

MED RENSNING)

STORMWATER

INTERCEPTION

(REGNVAND

OPTAGET AF TRÆET)

ENERGY

SAVINGS

(ENERGI

BESPARELSE)

Project

Name

Netto muldvolumen ca

og mulige potentiale for byerne: mere bæredygtighed,

10m 35m³, efter J.Urban

Kronediameter

Mare Street

i 40 år ca

livability og resiliens.

Vokset

Nedsivning af regnvand med rensning (LAR)

Location

Regnvand optages af træet

Hackney,

London,

Energibesparelse

Ejendomsværdi

Project Type

Ca 20% af muligt potentiale

PROPERTY VALUE

(EJENDOMS

VÆRDI)

STORMWATER

UTILITY

CREDIT

(NYTTE

VÆRDI AF REGNVANDET)

AIR QUILITY

(LUFT

KVALITET)

• Nytteværdi af regnvandet

CARBON

DIOXIDE NET

STORAGE

(CO2

OPTAGET I TRÆET)

• Luftkvalitet forbedres

CO optages i træet

•

• Bioretention (nedsivning med rensning)

• Stormwater interception (regnvand optaget af træet)

• Energy savings (energi besparelse)

• Property value (ejendoms værdi)

På baggrund af ”Street Tree Cost Benefit Analysis By Greenblue Urban”, ”Værdisætning af træer VAT19”. ”i-Tree - Tools for

•

Forests”.

Assessing and Managing Community Trees and

Stormwater utility credit (nytte værdi af regnvandet)

• Air quality (luft kvalitet)

•

Carbon dioxide net storage (CO2 optaget i træet)

De store potentialer og værdier for byen og samfundet kan opnås, når træerne får lov til at vokse ind

i den modne alder.

Træernes mulige potentiale for byerne (bæredygtighed, livability og re

Streetscape

KEF, Alm.del - 2023-24 - Bilag 202: Uddybende materiale af 7/2-24 fra Mattle ifm. foretræde den 30/11-23 om bytræers bidrag til løsning af byernes klimakriser

Bytræers tilvækstrater og CO

-optag

200,0

over en 80-årig periode

80-årigt træ:

200 m² kroneareal

Opsamler dette år 1.262 kg CO2

Indeholder 55.731 kg CO2

Har behov for >86 m³ jord

Træernes CO

-oplagring

stiger med levetiden

80-årigt træ:

200 m² kroneareal

Opsamler dette år 1.262 kg CO2

Indeholder 55.731 kg CO2

Har behov for >86 m³ jord

150 m² Kroneareal

1.200 kg CO2 opsamles pr. år

150,0

150 m² Kroneareal

60 ton Opsamlet CO2 i alt

100 m² Kroneareal

800 kg CO2 opsamles pr. år

100,0

100 m² Kroneareal

40 ton Opsamlet CO2 i alt

al /

50-årigt træ:

142 m² kroneareal

Opsamler dette år 967 kg CO2

Indeholder 20.429 kg CO2

Har behov for >61 m³ jord

50-årigt træ:

142 m² kroneareal

Opsamler dette år 967 kg CO2

Indeholder 20.429 kg CO2

Har behov for >61 m³ jord

et /

ton

træ

i al

50 m² Kroneareal

400 kg CO2 opsamles pr. år

50,0

50 m² Kroneareal

20 ton Opsamlet CO2 i alt

Fra sæson 55 er opbygningen

af CO2-indhold og masse ind i

træet størst

Opsamlet CO2 pr. år/kg

10-årigt træ:

38 m² kroneareal

Opsamler dette år 88 kg CO2

Indeholder 494 kg CO2

Har behov for >16 m³ jord

10-årigt træ:

38 m² kroneareal

Opsamler dette år 88 kg CO2

Indeholder 494 kg CO2

Har behov for >16 m³ jord

Vækstsæson efter plantning

Note:

Disse tilvækstrater er beregnet udfra en årlig tilvækst i stammeomfanget på 5 cm baseret på egne, danske målinger og et

træ plantet i et optimalt plantehul. Der er indlagt en maksimal tilvækst indtil vækstsæson 45. Herefter aftager den jævnt de

efterfølgende sæsoner. Omkring sæson 75 topper den årlige opsamling af CO2 pr. år.

Note:

Disse tilvækstrater er beregnet udfra en årlig tilvækst i stammeomfanget på 5 cm baseret på egne, danske målinger og et

træ plantet i et optimalt plantehul. Der er indlagt en maksimal tilvækst indtil vækstsæson 45. Herefter aftager den jævnt de

efterfølgende sæsoner.

Vækstsæson efter plantning

i tr

et /

KEF, Alm.del - 2023-24 - Bilag 202: Uddybende materiale af 7/2-24 fra Mattle ifm. foretræde den 30/11-23 om bytræers bidrag til løsning af byernes klimakriser

Kildehenvisninger:

•

Studies analyzing minimum soil volume n.

https://stormwater.pca.state.mn.us/index.php/Studies_analyzing _minimum_soil_volume_needed_by _trees

Denne kilde giver en god indgangsvinkel til de øvrige kilder.

•

ArborJournal16 Redesigning the urban forest fro the ground below: A new approach to specifying adquate

soil volumues for street trees:

http://www.hort.cornell.edu/uhi/research/articles/ArborJournal16.pdf

•

The Effects Of Restricted Volumes Of Soil On:

https://auf.isa-arbor.com/content/17/3/57

Bringing Order to the Technical Dysfunction within the Urban Forest:

https://static1.squarespace.com/static/52ec31b2e4b04eb0bbd9c075/t/5339ee00e4b029d638529446/1396305408895/

Bringing+Order+to+the+Technical+Dysfunction+within+the+Urban+Forest.pdf

•

Testing Of Structural Urban Tree Soil:

https://auf.isa-arbor.com/content/isa/22/6/255.full.pdf

Growth of Belgian elm in the coastal provinces of the Netherlands:

https://edepot.wur.nl/268344

Premature shedding of leaves and checked growth of 'Heidemij' poplar in roadside planlings:

https://edepot.wur.nl/266601

Better care for urban trees:

https://www.eskp.de/en/climate-change/better-care-for-urban-trees-9351072/https://www.eskp.de/en/climate-change/better-

care-for-urban-trees-9351072/

•

Guidance Urban Tree Planting:

https://www.leeds.gov.uk/docs/Guidance%20Urban%20Tree%20Planting.pdf

City Trees under Stress:

https://www.eskp.de/en/climate-change/city-trees-under-stress-9351071/

Urban tree database and allometric equations:

https://www.researchgate.net/publication/311512105_Urban_tree_database_and_allometric_equations

Learning from Forest Trees: Improving Urban Tree:

https://www.mdpi.com/1999-4907/14/7/1473

Tree growth rate under urban limiting conditions:

https://link.springer.com/article/10.1007/s10342-023-01599-0

Modeling Management-Relevant Urban Forest Stand:

https://doi.org/10.3390/f14112207

i-Tree 2.0-NL:

https://www.urbanforestry.nl/wp-content/uploads/2021/06/i-Tree-2.0-NL_project-plan_ june-2021.pdf

Urban Heat Island:

https://videnskab.dk/naturvidenskab/saadan-bremser-vi-global-opvarmning-koel-storbyerne-ned/#

The Green City Guidelines:

https://edepot.wur.nl/178666

Mattle ApS

Park Allé 18

6600 Vejen

Tlf.: +45 8844 1030

[email protected]

mattle.dk