Silva Fennica vol. 26 no. 1 | 1992
Category : Article
This paper presents the publishing guidelines of the Finnish Society of Forest Science for the forest scientific series of Silva Fennica. This paper presents the instructions to authors in Finnish, the English instructions are included in a separate PDF.
This paper presents the publishing guidelines of the Finnish Society of Forest Science for the forest scientific series of Silva Fennica. This paper includes the instructions to authors in English, the Finnish instructions are in a separate PDF.
This article is a book review on a German book ’Die Fichte’ by H. Schmidt-Vogt, summarizing the knowledge of the genus Picea and its 36 species.
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Leikola,
E-mail:
ml@mm.unknown
The article is a literature review focusing on the reaction of soil respiration, litter decomposition and microflora of forest soils to various pollutants like acidic deposition, heavy metals and unusual high amounts of basic cations. There is a great deal of evidence indicating that environmental pollution affects soil microbial activity and community structure. Much of the data originates from experimental designs where high levels of pollutants were applied to the soil under field or laboratory conditions. Furthermore, many were short-term experiments designed to look for large effects. These experiments have an indicative value, but it has to be kept in mind that environmental pollution is a combination of many pollutants, mostly at low concentrations, acting over long periods of time. There is therefore consequently a demand for research performed in natural forest environments polluted with anthropogenic compounds.
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Fritze,
E-mail:
hf@mm.unknown
A measurement system developed for the parallel and real-time measurement of temperature, matric potential and oxygen diffusion rate (ODR) of a growth medium was assessed. The system consisted of a portable computer, a datalogger, temperature sensors, tensiometers and an ODR-meter with Pt-sensors.
For the measurements, proper sensor contact with the growth medium was needed. For matric potential measurement, appropriate shape and material of the tensiometer tips should be selected for different measurement purposes. The determination of oxygen diffusion rate is based on single, non-continuous measurements. The ODR-measurement required special care with the insertion and handling of the electrodes and selection of applied voltage. The ODR-measurement of a coarse peat medium was applicable only at matric potentials > -5 kPa. This measurement system was shown to be useful and suitable for accurate determination of thermal-, water- and aeration conditions of a growth medium under greenhouse conditions.
The PDF includes an abstract in Finnish.
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Heiskanen,
E-mail:
jh@mm.unknown
- Laitinen, E-mail: jl@mm.unknown
The main stem of young Scots pine (Pinus sylvestris L.) trees was cut off halfway along the current leading shoot and the two previous years’ leading shoots to simulate moose (Alces alces) damage. Trees of the same size were chosen as controls before treatments. The experiment was inspected ten years after artificial stem breakage. Removing the current leading shoot and the second shoot did not essentially affect the height and diameter growth of the trees. Removal down to the third shoot reduced the height as well as diameter growth. The average loss in growth was equivalent to less than one year’s growth. When the stem was cut off at the second or third shoot, stem crookedness and the presence of knots resulted in stem defects that will subsequently reduce the sawtimber quality. A high proportion of the stem defects will obviously still be visible at the first thinning cutting. Removing injured trees as pulpwood and pruning the remaining parts of cut stems evidently improves the quality of pine stand with moose damage.
The PDF includes an abstract in Finnish.
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Heikkilä,
E-mail:
rh@mm.unknown
- Löyttyniemi, E-mail: kl@mm.unknown
A model for the succession of the forest ecosystem is described. The growth and development of trees and ground cover are controlled by temperature and light conditions and the availability of nitrogen and water. In addition, the effects of the annual cycle of trees including the risk of frost damage, wild fire, and wind damages are contained in the model as factors which control the survival and productivity of trees. The model also makes it possible to evaluated the risk of insect attack assuming that this risk is inversely related to the growth efficiency of trees.
The PDF includes an abstract in Finnish.
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Kellomäki,
E-mail:
sk@mm.unknown
- Hänninen, E-mail: hh@mm.unknown
- Kolström, E-mail: tk@mm.unknown
- Lauhanen, E-mail: rl@mm.unknown
- Mattila, E-mail: um@mm.unknown
- Pajari, E-mail: bp@mm.unknown
- Väisänen, E-mail: hv@mm.unknown
