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Articles by Eeva Korpilahti

Category: Article

article id 5405, category Article
Pertti Hari, Eeva Korpilahti, Toivo Pohja, Pentti K. Räsänen. (1990). A field system for measuring the gas exchange of forest trees. Silva Fennica vol. 24 no. 1 article id 5405. https://doi.org/10.14214/sf.a15557
Keywords: photosynthesis; CO2; monitoring; measuring methods; transpiration; environment; gas exchange; respiration
Abstract | View details | Full text in PDF | Author Info

A third generation of forest tree gas exchange measuring system design for the use in the field is described. The system is designed to produce data for determining the dependence of the rate of tree photosynthesis, respiration and transpiration on environmental factors. The system consists of eight cuvettes, a tubing system, two infrared gas analysers, an air flow controller, a data logger, and a computer. The measuring cuvette is a clap type, i.e. it is mostly open, only closing during measurement. CO2 exchange is measured as the change in the cuvette concentration of CO2, and, transpiration is measured as the increase in water vapour concentration while the cuvette is closed. The environmental factors measured are temperature, irradiance and air pressure. The system was planned in 1987 and constructed in 1988. It worked reliably in late summer 1988 and the quality of data seems to be satisfactory. 

The PDF includes an abstract in Finnish.

  • Hari, E-mail: ph@mm.unknown (email)
  • Korpilahti, E-mail: eeva.korpilahti@luke.fi
  • Pohja, E-mail: tp@mm.unknown
  • Räsänen, E-mail: pr@mm.unknown
article id 5274, category Article
Pertti Hari, Pirkko Heikinheimo, Leo Kaipiainen, Eeva Korpilahti, Annikki Mäkelä, Juha Samela. (1986). Trees as a water transport system. Silva Fennica vol. 20 no. 3 article id 5274. https://doi.org/10.14214/sf.a15453
Keywords: Pinus sylvestris; branches; stem; water transport system; cross-sectional-area; coarse roots
Abstract | View details | Full text in PDF | Author Info

The structure of 20 Scots pine (Pinus sylvestris L.) trees was analysed as a water transport system. There is a tight linear regression between the cross-sectional area of the stem at the height of its lowest living branch and the cross-sectional area of its coarse roots, between the cross-sectional area of the stem at the height of its lowest living branch and the total cross-sectional area of its branches, and between the cross-sectional area of the base of a branch and the total cross-sectional area of subsidiary branches of that branch. The capacity of successive organs, measured as cross-sectional areas, to transport water was thus found to be regular within a tree.

The PDF includes an abstract in Finnish.

  • Hari, E-mail: ph@mm.unknown (email)
  • Heikinheimo, E-mail: ph@mm.unknown
  • Kaipiainen, E-mail: lk@mm.unknown
  • Korpilahti, E-mail: eeva.korpilahti@luke.fi
  • Mäkelä, E-mail: am@mm.unknown
  • Samela, E-mail: js@mm.unknown

Category: Editorial

article id 10122, category Editorial
Eeva Korpilahti. (2018). Silva Fennica’s latest quarter centennial publishing. Silva Fennica vol. 52 no. 5 article id 10122. https://doi.org/10.14214/sf.10122
Full text in HTML | Full text in PDF | Author Info
  • Korpilahti, Finnish Society of Forest Science, P.O. Box 65, FI-00790 Helsinki, Finland E-mail: eeva.korpilahti@metsatiede.org (email)
article id 443, category Editorial
Eeva Korpilahti. (2012). From the Editor. Silva Fennica vol. 46 no. 1 article id 443. https://doi.org/10.14214/sf.443
View details | Full text in PDF | Author Info
  • Korpilahti, Finnish Forest Research Institute, P.O. Box 18, FI-01301 Vantaa, Finland E-mail: eeva.korpilahti@luke.fi (email)

Category: Article

article id 7649, category Article
Eeva Korpilahti. (1988). Photosynthetic production of Scots pine in the natural environment. Silva Fennica vol. 0 no. 202 article id 7649. https://doi.org/10.14214/aff.7649
Keywords: annual cycle; rate of photosynthesis; transpiration rate; stomatal regulation; irradiance response
Abstract | View details | Full text in PDF | Author Info

The dependence of the rates of photosynthesis and transpiration are studied on the environmental factors and on the control of the plant metabolism with Scots pine (Pinus sylvestris L.) in the natural environment. The importance of the different environmental factors to the photosynthetic production are evaluated. In modelling the dependence of the rates of photosynthesis and transpiration on the environmental factors and on the control processes, a dynamic system analysis approach is applied. Irradiance, temperature and water are explored during the annual cycle. Field measurements of the CO2 exchange and environmental factors over three years are used in the analysis of the rate of the photosynthesis. The effect of different environmental factors on photosynthetic production is evaluated by model estimations using weather data in a 20-year period.

The PDF includes a summary in Finnish.

  • Korpilahti, E-mail: ek@mm.unknown (email)
article id 7624, category Article
Pertti Hari, Seppo Kellomäki, Annikki Mäkelä, Pirkko Ilonen, Markku Kanninen, Eeva Korpilahti, Markku Nygren. (1982). Metsikön varhaiskehityksen dynamiikka. Silva Fennica vol. 0 no. 177 article id 7624. https://doi.org/10.14214/aff.7624
English title: Dynamics of early development of tree stand.
Original keywords: tiheys; mänty; metsikön rakenne; metsikön kehitys; valo-olosuhteet; yhteyttäminen
English keywords: Pinus sylvestris; stand structure; photosynthesis; Scots pine; density; stand development; light conditions
Abstract | View details | Full text in PDF | Author Info

The report concludes a series of studies on the early development of young Scots pine (Pinus sylvestris L.) stands. The basis assumption made in the study series was that the within-stand light regime is the main driving force for total tree growth and its allocation of photosynthates for crown, stem and root growth. An individual tree growing in a stand under a varying light regime which is controlled by the stand structure, is the basic unit used in the study. The photosynthesis of an individual tree is determined by the light regime. The stand is formed from individual trees.

The model is applied in simulation of the growth and development of tree stands. Several computer runs representing various densities, height distributions and tree species mixtures were carried out. Potential application areas, properties of the model and future needs of investigations are discussed.

The PDF includes a summary in English.

  • Hari, E-mail: ph@mm.unknown (email)
  • Kellomäki, E-mail: sk@mm.unknown
  • Mäkelä, E-mail: am@mm.unknown
  • Ilonen, E-mail: pi@mm.unknown
  • Kanninen, E-mail: mk@mm.unknown
  • Korpilahti, E-mail: ek@mm.unknown
  • Nygren, E-mail: mn@mm.unknown

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