Artikkelit kirjoittajalta Tytti Sarjala
Kasvualustan kuivumisen vaikutukset rahkasaraturpeeseen istutettujen männyntaimien ensikehitykseen.
English title: High and dry: Consequences of drought exposure in Scots pine seedlings grown in authentic peat soil.
Original keywords:
männyntaimet;
Pinus sylvestris;
kuivuus;
rahkasaraturve;
fotosynteesin tehokkuus (Fv/ Fm);
mykorritsat;
polyamiinit;
juurten ja versojen kasvu
English keywords:
drought;
Fv/Fm;
mycorrhizal colonization;
Pinus sylvestris seedlings;
poly-amines;
root and shoot growth;
Sphagnum-Carex peat
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Should the frequency of drought increase in boreal forests due to climate change, seedlings planted in prepared peat mounds could become more susceptible to soil desiccation. The resistance of Scots pine (Pinus sylvestris L.) seedlings to drought will thus be a key factor in the regeneration success of pine-dominated, forestry-drained peatlands. In this study, we evaluated the physiological, metabolic, and morphological responses of year-old seedlings gradually exposed to extreme drought in highly decomposed Sphagnum-Carex peat blocks. Drought clearly suppressed root and shoot growth as well as fractional colonization of ectomycorrhizal fungi. Sustained declines in photochemical efficiency (Fv/Fm) of previous-year and current-year needles did not occur until the volumetric soil water content had dropped to 30% and 10%, respectively. Polyamine analysis revealed that new needles are preferred in protecting the different parts of the seedlings against drought stress. Despite growth losses, the maintenance of rather high photochemical efficiency in current-year needles under severe water stress would appear to indicate a potential for seedling recovery if water availability in the peat improved. Given the high tolerance exhibited by Scots pine seedlings, death by drought seems a lesser concern.
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Pearson,
Finnish Forest Research Institute, Parkano Research Unit, Kaironiementie 15, FI-39700 Parkano, Finland
Sähköposti:
ei.tietoa@nn.oo
- Saarinen, Sähköposti: ei.tietoa@nn.oo
- Heiskanen, Sähköposti: ei.tietoa@nn.oo
- Sarjala, Sähköposti: ei.tietoa@nn.oo
- Laine, Sähköposti: ei.tietoa@nn.oo
Kuusen neulasanalyyttinen kaliumravitsemuksen arviointi eri vuodenaikoina.
English title: Estimating potassium nutrition of Norway spruce with needle analysis during different seasons.
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The aims of this study were 1) to get a better background for estimating limit values of potassium nutrition for Norway spruce (Picea abies L. Karst.) and 2) to find out if the needle potassium nutrition during dormancy could be estimated by analysing needles collected before the dormant period. Five groups of trees with different nutritional backgrounds were selected. One was on a shallow-peat (5–30 cm) mineral soil slope and four on a deep-peat site next to it. Needles were collected four times during the autumn months and twice during dormancy. The needle K concentration of a severe potassium deficiency limit indicated by the exponential accumulation of putrescine, was about 4.5 mg g–1. However, trees suffered from potassium shortage already at the potassium concentrations of about 5 mg g–1. The needle potassium concentrations during the autumn months from late August to early October were in very close correlation with the concentration during dormancy, y = 0.869x – 0.208 (r2 = 0.92), where y is the potassium concentration in the winter months and x that during the autumn months.
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Kaunisto,
The Finnish Forest Research Institute, Parkano Research Station, Kaironiementie 54, 39700 Parkano, Finland
Sähköposti:
ei.tietoa@nn.oo
- Sarjala, Sähköposti: ei.tietoa@nn.oo
Ectomycorrhizae in Scots pine seedlings at different trophic levels of a drained mire. A preliminary study.
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The mycorrhizal infection of the roots of four-year-old Scots pine seedlings was stud ied by analysing root ergosterol, endogenous polyamines, nitrogen, phosphorus and potassium concentrations after two years in the field.The seedlings had been planted in a 25-year-old pine plantation on an originally treeless mire representing a wide peat nitrogen gradient.Common mycorrhizal types with Scots pine, such as Cenococcum Piloderma and Boletaceae types, and a number of unidentified types were found in the roots.The roots contained quite normal or a little lower levels of ergosterol than re ported elsewhere on tree roots in mineral soil forests.After two growing seasons in the field a positive correlation (r =0.584**)was found between the root ergosterol and peat nitrogen concentrations.The root ergosterol and spermidine concentrations correlated positively.This may be due to a more abundant physical presence of the fungal tissue which contains more spermidine than the other polyamines, or it may be due to a posi tive effect of the mycorrhizal fungi on the metabolic activity of the roots.
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Sarjala,
Finnish Forest Research Institute, Parkano Research Station, Kaironiementie 54, FIN-39700 Parkano, Finland
Sähköposti:
ei.tietoa@nn.oo
- Kaunisto, Sähköposti: ei.tietoa@nn.oo
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