Suo - Mires and peat vol. 35 no. 3 | 1984
Säätekijoiden vaikutus ojitettujen turvemaiden mäntyjen sädekasvuun.
English title: The influence of climatic factors on the radial growth of Scots pine in drained peatlands.
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The aim of this study is to examine the effect of various climatic factors on the variation in the radial growth of Scots pine growing on drained peatlands. The computed radial growth indices of peatland stands were compared to the corresponding radial growth indices of pines on mineral soils and the results show that the variation in radial growth is rather similar in both mineral soil and drained peatland stands.
The most important climate factors affecting the radial growth of Scots pines on the ditch-side segments of the strip between ditches are the effective accumulative temperature of the previous growing season and the humidity (precipitation/mean temperature) in the beginning of the growing season in question. On the centre segment of the strip the most important climatic factor is precipitation sum of the previous growing season.
Site quality index, condition of drainage and diameter of the trees seem to affect the correlation between various climatic factors and the radial growth of Scots pines in drained peatlands.
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Joensuu,
Sähköposti:
ei.tietoa@nn.oo
Turpeen ioninvaihto-ominaisuuksista. Osa V: Eräiden Sphagnum-tyyppisten turvelajien ioninvaihto-ominaisuudet.
English title: The ion exchange properties of peat. Part V: Ion exchange properties of some Sphagnum peats.
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Normal milled peat contains different species of Sphagnum-peat. Five typical Sphagnum-peats were chosen for study in order to investigate differences in their ion exchange properties. IR-spectrum and TG-analysis reveal a great difference in the structure of the peat samples. Differences in the elementar composition does not effect on the ion exchange capacities. The ion exchange capacities of the different peat samples differ from each other S.fuscum having the largest capacity. This can be seen in IR-spectra at wave number region 1708—1727 cm-1. When the test solution first flows through the column the adsorption percentage is high but after a certain moment, the adsorption percentage decreases. The decrease obeys the first order kinetics.
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Aho,
Sähköposti:
ei.tietoa@nn.oo
- Tummavuori, Sähköposti: ei.tietoa@nn.oo
Senegalin turve-esiintymät.
English title: Peat deposits in Senegal.
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In the main part of Senegal the rainfall is very small compared to the evaporation. Therefore the peat forming vegetation can only be upheld eather by sea water or by ground water. Mangrove swamps are located in the estuaries of the main rivers. They cover wide areas but the deposition of peat requires special conditions. The mires upheld by fresh ground water are located on the coast north of Dakar. The develop-ment of the mires depends on the ground water level. If the water level is high, the depressions are inundated and ooze is deposited. Conversely during the phase of low ground water level the mineralization dominates. Because the area is located close to the sea, the ground water level is controlled by the sea as well as the climate.
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Pajunen,
Sähköposti:
ei.tietoa@nn.oo
Erään monimuuttujamenetelmän käyttämisestä suotyyppien välisten suhteiden tutkimisessa.
English title: Non-metric multidimensional scaling of a peatland vegetation data set.
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Non-metric multidimensional scaling (MDS) is used to produce a two-dimensional sample ordination of a set of peatland site type community data. The MDS ordination is assessed by comparing it to Heikurainen's and Pakarinen's informal two-dimensional ordination of peatland site types.
The MDS ordination produces clusters of quadrats which correspond to the five site types sampled. The result with species presence-absence data is similar to that with species percentage cover data although the clusters are more distinctive with presence-absence data.
The relationship of the five sampled site types to trophy and wetness gradients as indicated by Heikurainen and Pakarinen could only be approached by fitting curved, overlapping gradients in the MDS ordination. The reason for the curvature of the environmental gratients is considered to be largely the result of the bias towards nutrient poor and dry conditions represented by the site types sampled.
The effect of drainage upon ecological conditions in two of the site types sample is briefly discussed.
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Starr,
Sähköposti:
ei.tietoa@nn.oo
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