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Articles containing the keyword 'forest stand'

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

Category : Article

article id 7408, category Article
Kullervo Kuusela. (1953). On theory of forest increment calculation based on periodic measurements. Acta Forestalia Fennica vol. 60 no. 1 article id 7408. https://doi.org/10.14214/aff.7408
Keywords: forest stand; methodology; tree; normal forest; increment calculation
Abstract | View details | Full text in PDF | Author Info

The article presents the background of increment calculations and periodic measurements of forests, as well the historical development of increment calculations in North-America, Middle-Europe, Scandinavia and Finland. The measurements and calculations are presented for individual trees, for a forest stand and for the total resource of a normal forest stand.   

The practice of increment calculations has still some problems regarding the measurements of standing and harvested trees. The article discusses some ways to overcome the problems. 

  • Kuusela, E-mail: kk@mm.unknown (email)
article id 7298, category Article
V. T. Aaltonen. (1934). The development of a forest stand and the growth factors. Acta Forestalia Fennica vol. 40 no. 21 article id 7298. https://doi.org/10.14214/aff.7298
Keywords: forest management; light; forest stand; growth factor; water
Abstract | View details | Full text in PDF | Author Info

Water and amount of light are the most important growth factors and the article discusses their relationship. It is knows that the more space is needed by a tree the worse the site is. The number of stems varies between tree species. Common understanding is that amount of light is decisive to self-thinning and regeneration of a stand. On a good site the adequacy of water may substitute the lack of light. However, the fertility of soil and moisture content is more important than light.

The question of the importance of light, soil fertility and water content, as well as their relationship is important when optimizing the forest management.       

The PDF contains a summary in Finnish.  

  • Aaltonen, E-mail: va@mm.unknown (email)
article id 7085, category Article
Yrjö Ilvessalo. (1923). Paper on the correlation between the characteristics of the soil and the growth of forest stand. Acta Forestalia Fennica vol. 25 no. 10 article id 7085. https://doi.org/10.14214/aff.7085
Keywords: site quality; nitrogen; soil; correlation; lime; forest stand; calcium
Abstract | View details | Full text in PDF | Author Info

The study is based on the results of the soil studies by Valmari (1921) and the growth inventories of respective areas. The aim is to show the connection of soil fertility (nutrient content) and forest growth with means of correlation calculations. The examined nutrients were nitrogen, calcium and phosphorus, also the electrolyte content was studied.

The results show that with increase of nitrogen content of the soil the growth of pine stand increases as well. The correlation is clearly identified. The number of birch and spruce stands is too small for systematic review. For calcium there is a similar kind of relation. With phosphorus content or amount of electrolytes the correlation with doesn’t exist. Also the loss on ignition test was conducted. The relation found is somewhat weak.
  • Ilvessalo, E-mail: yi@mm.unknown (email)

Category : Research article

article id 23019, category Research article
Victor F. Strîmbu, Tron Eid, Terje Gobakken. (2023). A stand level scenario model for the Norwegian forestry – a case study on forest management under climate change. Silva Fennica vol. 57 no. 2 article id 23019. https://doi.org/10.14214/sf.23019
Keywords: forest planning; carbon balance; climate change mitigation; forest stand simulator
Highlights: GAYA 2.0: a new scenario analysis model focusing on forest carbon fluxes; Carbon sequestration potential estimated at regional level; GAYA 2.0 may be used to estimate the costs of obtaining carbon benefits by adapting the forest management.
Abstract | Full text in HTML | Full text in PDF | Author Info
Carbon sequestration and income generation are competing objectives in modern forest management. The climate commitments of many countries depend on forests as carbon sinks which must be quantified, monitored, and projected into the future. For projections we need tools to model forest development and perform scenario analyses to assess future carbon sequestration potentials under different management regimes, the expected net present value of such regimes, and possible impacts of climate change. We propose a scenario analysis software tool (GAYA 2.0) that can assist in answering these types of questions using stand level simulations, detailed carbon flow models and an optimizer. This paper has two objectives: (1) to describe GAYA 2.0, and (2) demonstrate its potential in a case study where we analyze the forest carbon balance over a region in Norway based on national forest inventory sample plots. The tool was used to map the optimality front between the carbon benefit and net present value. We observed changes in net present value for different levels of carbon benefit as well as changes in optimal management strategies. We predicted future changes in several forest carbon pools as well as albedo and illustrated the impact of gradual increase in forest productivity (i.e., due to climate warming). Having been updated and modernized from its previous version with increased attention to forest carbon and energy fluxes, GAYA 2.0 is an effective tool that offers multiple opportunities to perform various types of scenario analyses in forest management.
  • Strîmbu, Norwegian University of Life Sciences, Faculty of Environmental Sciences and Natural Resource Management, NO-1432 Ås, Norway ORCID https://orcid.org/0000-0002-0588-2036 E-mail: victor.strimbu@nmbu.no (email)
  • Eid, Norwegian University of Life Sciences, Faculty of Environmental Sciences and Natural Resource Management, NO-1432 Ås, Norway E-mail: tron.eid@nmbu.no
  • Gobakken, Norwegian University of Life Sciences, Faculty of Environmental Sciences and Natural Resource Management, NO-1432 Ås, Norway ORCID https://orcid.org/0000-0001-5534-049X E-mail: terje.gobakken@nmbu.no

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