1. Viikki experimental streets Built by the City of Helsinki public works department and Helsinki University with TEKES funding in 2002-2003, co-operation with Tampere polytechnic, Infratec Oy, Lemminkäinen Oy, Kekkilä Oyj, Fountain Oy, Tihveräinen Oy Project leader Eero Nikinmaa –Planning and building stage: Jenni Sirviö –Helsinki City: Pentti Peurasuo 2 streets in Viikki area: –Norkkokuja in residential area –Pasteurinkatu in campus/office area 3 sectors with different soil in each street

2. Setup Skeletal soils –Skeleton of smaller (d 32-64mm) or larger (d 64-140mm) rocks –75 to 80 % of rocks and 20 to 25 % of soil (weight) –in volumetric terms: rocks ~45 %, soil ~45 %, + ~10 % empty space –different soils soil 1: added N + minerals that slowly release P and K, low on organic matter (less than 6 %) soil 2: high organic matter content (about 20 %), plenty of easily available nutrients soil 3: coarse sand, little organic matter (less than 6 %) laboratory tested for load bearing properties: all equally good One meter deep, continuous layer of growth medium

3. Skeletal soil n:o 2

4. Setup pavement: 3 different types alder (Alnus glutinosa var. pyramidalis) in Norkkokuja and linden (Tilia x vulgaris, T. sp) in Pasteurinkatu ~5 trees per treatment in Norkkokuja, 3 in Pasteurinkatu 3 intensive monitoring points per street 8 manual points in Pasteurinkatu, 11 in Norkkokuja

5. Monitoring Intensive monitoring in every 5-10 minutes Soil: automatic –Temperature profile –Soil moisture profile Soil: manual –Gas concentrations (manually, ~once per month) –root development: samples every 1-2 years –soil nutrients, SOM, Pf-curves yrs 2003, 2005, 2008 Above ground: automatic –PAR –Air temp Other micrometeorological information from Kumpula weather station

6. Monitoring Tree: automatic –sap flow: needles and collar methods –trunk growth: collar Tree: manual –shoot growth: manually, 2-3 times/week –structure, leaf area: once per growing season –gas exchange, net photosynthesis and chlorophyll fluorescence in June and August –leaf nutrient status every 1-2 years –growth analysis pictures in the beginning and end of growing season