Long term in situ measurements of gas exchange in a Norway spruce canopy at ambient and elevated ozone levels using a light weight chamber system - System designs and first results

Teis Nørgaard Mikkelsen, Helge Ro-Poulsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The gas exchange system is computer controlled and is designed to measure and control 14 temperature regulated chambers enclosing spruce twigs for several months with minimum ozone absorption. The system is mounted on sun exposed single year classes of a Norway spruce stand in western Jutland, Denmark. Since July 1994 the temperature control system has been in function. Results show that 95% of the temperature measurements inside the cuvettes are within the range -2 to +3 degrees C of the ambient temperature. Gas exchange measurements show that the current year shoots have a higher net photosynthesis than the older shoots. The net photosynthesis in current year needles on sunny days is significantly reduced by the 6 h daily 30-40 ppb ozone addition.
Original languageEnglish
JournalWater, Air and Soil Pollution
Volume85
Issue number3
Pages (from-to)1413-1418
Number of pages6
ISSN0049-6979
DOIs
Publication statusPublished - 1995
Externally publishedYes

Keywords

  • Age classes
  • Branch cuvette
  • Chamber design
  • CO2
  • Gas exchange
  • Ozone
  • Picea abies
  • Photosynthesis transpiration
  • Twigs

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