Current issue: 58(1)

Under compilation: 58(2)

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Silva Fennica 1926-1997
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Acta Forestalia Fennica
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Articles containing the keyword 'rivers'

Category : Article

article id 5240, category Article
Pertti Harstela, Kimmo Piirainen. (1985). Effect of whole-body vibration and driving a forest machine simulator on some physiological variables of the operator. Silva Fennica vol. 19 no. 2 article id 5240. https://doi.org/10.14214/sf.a15419
Keywords: heart rate; forest workers; ergonomy; occupational health; physical stress; forestry equipment; forest machine drivers; horizontal vibration
Abstract | View details | Full text in PDF | Author Info

The influence of horizontal whole-body vibration of fairly low intensity alone and combined with the mental load and motor action typical for the forest machine drive on heart rate variability (HRV), respiration rate (RR) and heart rate (HR) was studied by testing five subjects. Horizontal vibration had an influence on HR, HRV and RR. ’Control activities’ had the most influence on RR and HRV, but some influence on HR, too. ’Moving the control devices’ (motor action) gave the same response in HR as ’control activities’, but not in HRV and RR. ’Control activities’ together with ’vibration’ had a more effect on HRV and RR than these two factors singly, but not on HR. The possibilities of using these variables in field studies are discussed.

The PDF includes a summary in Finnish.

  • Harstela, E-mail: ph@mm.unknown (email)
  • Piirainen, E-mail: kp@mm.unknown
article id 5172, category Article
Pekka Hynninen, Pentti Sepponen. (1983). Erään suoalueen ojituksen vaikutus purovesien laatuun Kiiminkijoen vesistöalueella, Pohjois-Suomessa. Silva Fennica vol. 17 no. 1 article id 5172. https://doi.org/10.14214/sf.a15087
English title: The effect of drainage on the quality of brook waters in the Kiiminkijoki River basin, Northern Finland.
Original keywords: Pohjois-Suomi; soiden ojitus; hydrologia; veden laatu; purot; joet; liukoiset ravinteet
English keywords: water quality; northern Finland; suspended solids; hydrology; draining of peatlands; brooks; rivers
Abstract | View details | Full text in PDF | Author Info

The present study deals with the effect of forest drainage on some quality factors of brook waters. Under study were several brooks in the basin of the Kiiminkijoki River as well as its main tributary, the Nuorittajoki River. These are located in Northern Finland and belong to the international water program Project Aqua.

The following values were determined for the water samples: pH, electric conductivity, colour, concentration of suspended solids., NO2, NO3, and NH4 nitrogen concentrations, dissolved and total phosphorus, and Ca, Mg, K and Fe concentrations. Water quality in the brooks was monitored prior to and after ditching. A statistically significant change was noted in colour, in the concentration of suspended solids, in the NH4 concentration and in some brooks also in the pH value and in the total phosphorus, K, and Fe concentrations.

The PDF includes a summary in English.

  • Hynninen, E-mail: ph@mm.unknown (email)
  • Sepponen, E-mail: ps@mm.unknown

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