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

doi:10.1007/BF00477179

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

University of Copenhagen

Research output: Contribution to journal › Journal article › Research › peer-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 language	English
Journal	Water, Air and Soil Pollution
Volume	85
Issue number	3
Pages (from-to)	1413-1418
Number of pages	6
ISSN	0049-6979
DOIs	https://doi.org/10.1007/BF00477179
Publication status	Published - 1995
Externally published	Yes

Keywords

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

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10.1007/BF00477179

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title = "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",

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.",

keywords = "Age classes, Branch cuvette, Chamber design, CO2, Gas exchange, Ozone, Picea abies, Photosynthesis transpiration, Twigs",

author = "Mikkelsen, {Teis N{\o}rgaard} and Helge Ro-Poulsen",

year = "1995",

doi = "10.1007/BF00477179",

language = "English",

volume = "85",

pages = "1413--1418",

journal = "Water, Air and Soil Pollution",

issn = "0049-6979",

publisher = "Springer Netherlands",

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}

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. / Mikkelsen, Teis Nørgaard; Ro-Poulsen, Helge.
In: Water, Air and Soil Pollution, Vol. 85, No. 3, 1995, p. 1413-1418.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - 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

AU - Mikkelsen, Teis Nørgaard

AU - Ro-Poulsen, Helge

PY - 1995

Y1 - 1995

N2 - 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.

AB - 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.

KW - Age classes

KW - Branch cuvette

KW - Chamber design

KW - CO2

KW - Gas exchange

KW - Ozone

KW - Picea abies

KW - Photosynthesis transpiration

KW - Twigs

U2 - 10.1007/BF00477179

DO - 10.1007/BF00477179

M3 - Journal article

SN - 0049-6979

VL - 85

SP - 1413

EP - 1418

JO - Water, Air and Soil Pollution

JF - Water, Air and Soil Pollution

IS - 3

ER -

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

Abstract

Keywords

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