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Articles by Raimo Salminen

Category : Article

article id 5019, category Article
Pertti Hari, Markku Kanninen, Seppo Kellomäki, Olavi Luukkanen, Paavo Pelkonen, Raimo Salminen, Heikki Smolander. (1979). An automatic system for measurements of gas exchange and environmental factors in a forest stand, with special reference to measuring principles. Silva Fennica vol. 13 no. 1 article id 5019. https://doi.org/10.14214/sf.a14873
Keywords: Pinus sylvestris; photosynthesis; Scots pine; environmental factors; ecology; transpiration; measurement tecniques; forest stand
Abstract | View details | Full text in PDF | Author Info

A system for measuring the net photosynthesis, transpiration and environmental factors within the canopy and ground cover vegetation is described. The system operates continuously throughout the growing season in a young Scots pine (Pinus sylvestris L.) stand. A data-logging unit controls the system and carries out the measurements on the readings of the sensors of photosynthesis, transpiration, light intensity outside the canopy, light climate inside the assimilation chambers, and dry and wet temperatures from selected points. These measurements are shown digitally and automatically punched onto paper tape.

The PDF includes a summary in Finnish.

  • Hari, E-mail: ph@mm.unknown (email)
  • Kanninen, E-mail: mk@mm.unknown
  • Kellomäki, E-mail: sk@mm.unknown
  • Luukkanen, E-mail: ol@mm.unknown
  • Pelkonen, E-mail: pp@mm.unknown
  • Salminen, E-mail: rs@mm.unknown
  • Smolander, E-mail: hs@mm.unknown
article id 4937, category Article
Pertti Hari, Mikko Huhtamaa, Paavo Pelkonen, Veli Pohjonen, Raimo Salminen. (1976). A new approach for measuring light inside the canopy in photosynthesis studies. Silva Fennica vol. 10 no. 2 article id 4937. https://doi.org/10.14214/sf.a14782
Keywords: photosynthesis; canopy; light intensity; measuring methods
Abstract | View details | Full text in PDF | Author Info

Light intensity inside the canopy varies considerably both in space and time. A new apparatus was developed which is disturbed as little as possible by the above-mentioned variation. The construction is based on the linear relationships between light intensity (measured using silicon diodes) and photosynthesis. This procedure permits linear operations (summing and integration) to be carried out on the output of the diodes without any loss of accuracy. There are five diodes in each assimilation chamber. A model, in which the independent variables include ligth, measured with the present equipment, and temperature, fits the photosynthetic rates well even inside the canopy.

The PDF includes a summary in Finnish.

  • Hari, E-mail: ph@mm.unknown (email)
  • Huhtamaa, E-mail: mh@mm.unknown
  • Pelkonen, E-mail: pp@mm.unknown
  • Pohjonen, E-mail: vp@mm.unknown
  • Salminen, E-mail: rs@mm.unknown

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