Artikkelit kirjoittajalta Antti Pätilä
Puuston kasvu ja ravinteiden saatavuus turvemaiden vanhoilla kalkituskokeilla.
English title: The growth of Scots pine and the availability of nutrients in old Finnish liming experiments on drained peatlands.
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Liming (with applications of 1 000 to 8 000 kg ha1) had no long-term (1929-1985) effect on the growth of Scots pine on drained oligotrophic peatlands. Liming plus NPK fertilization had a variable effect on the growth of the stands. The same treatment could result in a very different response in different experimental areas. Both liming alone and liming plus NPK fertilization increased the calcium, magnesium and nitrogen contents of peat and decreased the C/N ratio and acidity. Liming plus fertilization decreased needle boron and manganese and increased calcium and nitrogen concentrations. The results of peat and needle analysis indicated that the changes in nitrogen availability to trees caused by liming have not been sufficient enough to affect tree growth. It was also concluded that boron deficiency was the main reason for the lowered yield.
Key words: fertilization, needle nutrients, peat nutrients, Pinus sylvestris, tree growth
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Nieminen,
The Finnish Forest Research Institute, P.O. Box 18, FIN-01301 Vantaa, Finland
Sähköposti:
ei.tietoa@nn.oo
- Pätilä, Sähköposti: ei.tietoa@nn.oo
Ojitettujen rämeiden pohjaveden laatu ja sen riippuvuus turpeen kemiallisista ominaisuuksista.
English title: Groundwater quality and its relationship to peat chemical properties on drained pine mires.
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The variation in groundwater nutrient concentrations from 29 oligotrophy pine mires were described. The relationships between groundwater chemistry and the chemical status of the surface peat layer were also investigated. The mean groundwater quality in different site type fertility groups was: pH 4.0-4.8; NH4+-N 0.45-0.80 mg l-1; P 0.06-0.15 mg l-1; K 0.27-0.54 mg l-1 ; Ca 1.40-3.78 mg l-1; Mg 0.49-1.67 mg l-1; Mn 0.01-0.12 mg I-1; Fe 0.69-3.20 mg l-1; Al 0.34-0.57 mg i-1; Zn 0.006-0.015 mg I-1; Na 0.63-1.91 mg l-1; B 0.008-0.010 mg l-1 and S 1.15-1.47 mg l-1. When ordered from the most infertile to the most fertile site types, groundwater pH and total concentrations of Ca, Mg, Mn, Fe and Na significantly (P < 0.001) increased. There was a large seasonal variation in the concentrations of S, K, Na, B and Zn, and a large within-plot variation in K, NH4+-N, P and B concentrations. The results indicated that factors other than the chemistry of peat were involved in determining the concentrations of these nutrients in the groundwater. Groundwater concentrations of Al, Fe, Ca and Mg, on the other hand, were found to be strongly correlated with the corresponding total nutrient concentrations in the surface peat layer.
Keywords: peatlands, peat nutrients, water chemistry
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Nieminen,
The Finnish Forest Research Institute, P.O. Box 18, SF-01301 Vantaa, Finland
Sähköposti:
ei.tietoa@nn.oo
- Pätilä, Sähköposti: ei.tietoa@nn.oo
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