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Viikki Urban Street Tree Laboratory. Dr. Eero Nikinmaa. Aims. To test the load bearing soils as base material of streets/ pavements and growth media for trees in normal urban environment Characterise the urban environment Monitor the tree behaviour. Site: Normal modern street in Helsinki.

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Presentation Transcript
slide2
Aims
  • To test the load bearing soils as base material of streets/ pavements and growth media for trees in normal urban environment
  • Characterise the urban environment
  • Monitor the tree behaviour
load bearing soils
Load Bearing Soils
  • Skeleton of smaller (d 32-64mm) or larger (d 64-140mm) rocks
  • between 75 to 80% of rocks and 20 to 25% of soil (weight)
  • variation in soil:
    • high organic matter content (about 20%)
    • sandy
    • added N + slowly releasing P and Ca
  • laboratory tested for load bearing properties
study design
Study design
  • 2 streets
  • 3 sectors with different soil in each street
  • Alder and Linden
  • ~5-6 trees per treatment per street
  • 3 intensive monitoring points per street
  • 9 manual points

Street I

Street II

Manual monitoring

Different soils

Intensive

Monitoring

monitoring intensive monitoring every 10 minutes manual monitoringonce in 2 to 3 weeks
Soil

Temperature profile

Soil moisture profile

Gas concentrations

Above ground

PAR

Air temp

Other micromet. from close by station

Tree (intensive)

sapflow (2 methods)

growth

Tree (manual)

gas exchange + physiology studies

leaf nutrients

structure

Monitoring-Intensive monitoring every 10 minutes- Manual monitoringonce in 2 to 3 weeks
manual measuring point
Manual measuring point

21

Gas collectors

Temperature

Soil moisture

above ground
Above ground

PAR

Air Temperature

slide13
Tree

Sap flow

Heat dissipation

Sap flow

Diam change

diameter growth and diurnal variation
Diameter Growth and diurnal variation

Norkkokuja

Pasteurinkatu

Dead Tree

soil moisture
Soil Moisture

Pasteurinkatu

Norkkokuja

soil temperature
Soil Temperature

Norkkokuja

Pasteurinkatu

conclusion this far
Conclusion this far
  • Measurements are technically OK
  • Monitoring feasible
  • The growth media seem to reflect to tree performance