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Viikki experimental streets

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

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Viikki experimental streets

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  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

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