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Viikki Urban Street Tree Laboratory

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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Viikki Urban Street Tree Laboratory

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  1. Viikki Urban Street Tree Laboratory Dr. Eero Nikinmaa

  2. 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

  3. Site: Normal modern street in Helsinki

  4. 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

  5. Water holding capacity

  6. Soil nutrient analysis

  7. Building phase

  8. 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

  9. 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

  10. Temp. profile Soil Gas profile

  11. Manual measuring point 21 Gas collectors Temperature Soil moisture

  12. Above ground PAR Air Temperature

  13. Tree Sap flow Heat dissipation Sap flow Diam change

  14. Data Transfer

  15. Manual measurements

  16. Photosynthetic production at Norkkukuja and Pasteurin katu - streets

  17. Stomatal conductance, Pasteurin katu - street

  18. Stomatal Conductance, Norkkokuja - Street

  19. Diameter Growth and diurnal variation Norkkokuja Pasteurinkatu Dead Tree

  20. Soil Moisture Pasteurinkatu Norkkokuja

  21. Soil Temperature Norkkokuja Pasteurinkatu

  22. CO2- Concentration

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

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