Artikkelit jotka sisältää sanan 'shelter'
Koivun soveltuvuus suonpohjien metsittämisessä Irlannissa.
English title: The potential of birch afforestation as an after-use option for industrial cutaway peatlands.
Avainsanat:
fertilization;
Biomass;
natural regeneration;
downy birch;
cutaway peatlands;
sowing;
shelter
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In the next few decades, industrial peat extraction will cease gradually over more than 80,000 hectares of cutaway peatlands in Ireland and alternative land uses will change the landscape of these areas. This study showed that substantial natural regeneration of downy birch (Betula pubescens) can occur on abandoned as well as cutaway peatlands afforested with conifers. Natural seedling birch stands measured in this study had an estimated biomass production of between 3100 and 5800 kg dry matter ha–1 year–1. This corresponded to an annual carbon stock increment estimated at between 1500 and 2900 kg C ha–1. Direct sowing experiments conducted in this study were the first of their kind in Ireland and showed that sowing downy birch and fertilization with P and K could be a possible management option for the after-use of cutaway peatlands. Exposure was the main obstacle to successful germination and artificial shelter led to higher rates of germination and survival of birch seedlings after the first winter. It can be concluded that birch (naturally or artificially established) can be a feature of this future landscape, bringing many attributes: nurse species, biomass, increased woodland cover and biodiversity.
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Renou-Wilson,
F. Renou-Wilson, School of Biology and Environmental Science, Agriculture and Food Centre, University College Dublin, Belfield, Dublin 4. Tel: +353 17167725; Fax: +353 17161102; email: Florence.Renou@ucd.ie
Sähköposti:
ei.tietoa@nn.oo
- Pöllänen, Sähköposti: ei.tietoa@nn.oo
- Byrne, Sähköposti: ei.tietoa@nn.oo
- Wilson, Sähköposti: ei.tietoa@nn.oo
- Farrell, Sähköposti: ei.tietoa@nn.oo
Neulasten pääravinnepitoisuuksien muutokset turvekankaan alikasvoskuusikossa ylispuuhakkuun jälkeen.
English title: Effects of the removal of shelterwood on the foliar nutrient concentrations of Norway spruce (Picea abies (L.) Karst.) on drained peatlands.
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Abstract: The foliar chemical composition of a Norway spruce underwood were analysed one year before and in three years after the removal of a downy birch (Betula pubescens Ehrh.) shelterwood on an old drainage area. The most remarkable change due to the release was considered to be the significant decrease in the potassium concentrations. The nitrogen concentrations increased very strongly, and phosphorus increased slightly but not significantly during the first growth period after the release, decreasing later to a level approaching the deficiency limit. Consequently the nutrient balance between N and K was strongly shaken by the increased N/K-ratio. One reason for that might be the increased use of K in the growing points of roots after the root competition of shelterwood was eliminated.
Key words: foliar analysis, nutrients, peatlands, Picea abies, shelterwood, underwood.
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Saarinen,
The Finnish Forest Research Institute, Parkano Research Station, Kaironiementie 54, FIN-39700 Parkano, Finland
Sähköposti:
ei.tietoa@nn.oo
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