Artikkelit kirjoittajalta Edward Farrell

Florence Renou-Wilson, Minna Pöllänen, Kenneth Byrne, David Wilson, Edward Farrell. 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.
  • 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: Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Pöllänen, Sähköposti: ei.tietoa@nn.oo
  • Byrne, Sähköposti: ei.tietoa@nn.oo
  • Wilson, Sähköposti: ei.tietoa@nn.oo
  • Farrell, Sähköposti: ei.tietoa@nn.oo
Alan Gilmer, Nicholas Holden, Shane Ward, Anthony Brereton, Edward Farrell. A model of organic matter accumulation in a developing fen/raised bog complex.
Avainsanat: peat; peatlands; mires; climate; Sphagnum productivity
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A mechanistic simulation model of organic matter accumulation for a developing fen/ raised bog complex in Ireland is presented.Parameter/variable values have been prima rily drawn from the published literature.The development of the theoretical considera tions of fen peat as a substratum to a raised bog is evaluated using the model.Terrestri alization is the pathway of hydroseral succession.The conceptual model treats peat growth as the accumulation of a series of parcels comprising both a labile and a non- labile component.The fen phase of the model uses a discrete description of organic matter accumulation while the raised bog phase uses a continuous description.Both phases use a constant decay rate.The model integrates changes in net primary produc tivity and aerobic decay to simulate four climatic periods.The model generates outputs for peat depth and mass with time and profiles of bulk density with depth.Results over a simulated period of 10 000 years demonstrate how changes in surface net primary productivity and aerobic decay can change the rate of peat accumulation in the develop ing fen/raised bog complex.Sensitivity analysis showed that the most important pa rameters influencing simulated depth and mass were the labile fraction in organic mat ter (raised bog)followed by net primary productivity (raised bog).The potential sig nificance of underlying fen peat as a proportion of the total depth and mass of a devel oping fen/raised bog complex was evaluated and shown to be substantially diminished after 5 000 years.It was established that the model predictions corresponded well with data for Irish Midland bogs and given suitable adjustment of values, could potentially simulate Fennoscandian conditions as well.
  • Gilmer, Department of Agricultural & Food Engineering (Peat Technology Centre), University College Dublin, Earlsfort Terrace, Dublin 2, Ireland Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Holden, Sähköposti: ei.tietoa@nn.oo
  • Ward, Sähköposti: ei.tietoa@nn.oo
  • Brereton, Sähköposti: ei.tietoa@nn.oo
  • Farrell, Sähköposti: ei.tietoa@nn.oo

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