Utilizing a multipoint measuring system of photosynthetically active radiation in photosynthetic studies within canopies
A novel multipoint measuring system of photosynthetically active radiation (PAR) has been constructed and operated within a Scots pine canopy. A regular grid of 800 measuring points has been incorporated into a cuvette to observe the spatial and temporal distribution of PAR incident o...
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Finnish Society of Forest Science
1998-01-01
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Series: | Silva Fennica |
Online Access: | https://www.silvafennica.fi/article/673 |
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doaj-b5a773b2f90b4374b3e44ff40e6512462020-11-25T02:04:34ZengFinnish Society of Forest ScienceSilva Fennica2242-40751998-01-0132410.14214/sf.673Utilizing a multipoint measuring system of photosynthetically active radiation in photosynthetic studies within canopiesPalva, LauriGaram, EeroPalmroth, SariSepponen, RaimoHari, Pertti A novel multipoint measuring system of photosynthetically active radiation (PAR) has been constructed and operated within a Scots pine canopy. A regular grid of 800 measuring points has been incorporated into a cuvette to observe the spatial and temporal distribution of PAR incident on the needles of a twig along with simultaneous measurements of the CO2 exchange in order to determine the dependence of photosynthesis on PAR. It was shown that large errors can result if the photosynthetic rate is estimated using the mean value of PAR instead of the instantaneous values of PAR detected at given points in the region of the needles. The results demonstrate that the obtained regression between the CO2 exchange rate estimated using the multipoint PAR measuring system and the measured CO2 exchange rate is as good within a canopy as in unshaded conditions.https://www.silvafennica.fi/article/673 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Palva, Lauri Garam, Eero Palmroth, Sari Sepponen, Raimo Hari, Pertti |
spellingShingle |
Palva, Lauri Garam, Eero Palmroth, Sari Sepponen, Raimo Hari, Pertti Utilizing a multipoint measuring system of photosynthetically active radiation in photosynthetic studies within canopies Silva Fennica |
author_facet |
Palva, Lauri Garam, Eero Palmroth, Sari Sepponen, Raimo Hari, Pertti |
author_sort |
Palva, Lauri |
title |
Utilizing a multipoint measuring system of photosynthetically active radiation in photosynthetic studies within canopies |
title_short |
Utilizing a multipoint measuring system of photosynthetically active radiation in photosynthetic studies within canopies |
title_full |
Utilizing a multipoint measuring system of photosynthetically active radiation in photosynthetic studies within canopies |
title_fullStr |
Utilizing a multipoint measuring system of photosynthetically active radiation in photosynthetic studies within canopies |
title_full_unstemmed |
Utilizing a multipoint measuring system of photosynthetically active radiation in photosynthetic studies within canopies |
title_sort |
utilizing a multipoint measuring system of photosynthetically active radiation in photosynthetic studies within canopies |
publisher |
Finnish Society of Forest Science |
series |
Silva Fennica |
issn |
2242-4075 |
publishDate |
1998-01-01 |
description |
A novel multipoint measuring system of photosynthetically active radiation (PAR) has been constructed and operated within a Scots pine canopy. A regular grid of 800 measuring points has been incorporated into a cuvette to observe the spatial and temporal distribution of PAR incident on the needles of a twig along with simultaneous measurements of the CO2 exchange in order to determine the dependence of photosynthesis on PAR. It was shown that large errors can result if the photosynthetic rate is estimated using the mean value of PAR instead of the instantaneous values of PAR detected at given points in the region of the needles. The results demonstrate that the obtained regression between the CO2 exchange rate estimated using the multipoint PAR measuring system and the measured CO2 exchange rate is as good within a canopy as in unshaded conditions. |
url |
https://www.silvafennica.fi/article/673 |
work_keys_str_mv |
AT palvalauri utilizingamultipointmeasuringsystemofphotosyntheticallyactiveradiationinphotosyntheticstudieswithincanopies AT garameero utilizingamultipointmeasuringsystemofphotosyntheticallyactiveradiationinphotosyntheticstudieswithincanopies AT palmrothsari utilizingamultipointmeasuringsystemofphotosyntheticallyactiveradiationinphotosyntheticstudieswithincanopies AT sepponenraimo utilizingamultipointmeasuringsystemofphotosyntheticallyactiveradiationinphotosyntheticstudieswithincanopies AT haripertti utilizingamultipointmeasuringsystemofphotosyntheticallyactiveradiationinphotosyntheticstudieswithincanopies |
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1724942456568414208 |