Artikkelit jotka sisältää sanan 'Carbon stores'
Estimates of carbon stores in four Northern Irish lowland raised bogs.
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Soils store more carbon (C) than does vegetation and in Northern Ireland peat has been estimated to account for about 42% of the soil C store. This estimate, however, was based on incomplete field evidence, including uncertainty on peat depths and peat bulk density. This paper aims to show how the estimate might be improved, taking into account bulk density and carbon density measurement. Trial 3-D models are presented to estimate total C content of individual bogs. Results suggest that C stores in northern Irish lowland raised bogs are lower than previously estimated primarily because of low bulk densities which showed no consistent increase with peat depth. Bulk density varied within and between bog profiles on the same bog and between bogs leading to different estimates of C stores. The research indicates a need for more precise modelling of bogs based on stratigraphy and dating of layers and a need for standardised measurement of peat bulk density and carbon storage. The findings, particularly if they apply to the extensive blanket bog, affect local and national totals of soil C stores and have implications for national policies on increasing/preserving C stores.
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Tomlinson,
School of Geography, The Queen’s University of Belfast, BT7 1NN, Northern Ireland
Sähköposti:
ei.tietoa@nn.oo
- Davidson, Sähköposti: ei.tietoa@nn.oo
A method to estimate the effect of forest drainage on the carbon store of a mire.
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Mires are sinks for carbon. Drainage enhances the aerobic microbial decomposition of the surface peat, which may transform mires into net sources of carbon to the atmosphere. However, the increase in the growth of the tree stand and consequent fixation of carbon after drainage may be expected to have a compensating effect. The effects of drainage on the carbon stores of a mire are not easy to establish. This paper discusses a method that can be used to assess the changes in cases where part of the mire has been left in the virgin condition. The method is based on bulk density and carbon content profiles measured along a transect running from the undrained part to the drained part of the mire. The carbon store of the peat in each case is calculated for the peat depth in which drainage is considered to have caused changes. The subsidence at each measuring point on the drained side is subtracted from the original peat depth before carbon store calculations.
Keywords: Boreal zone, carbon stores, peatland forestry
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Laine,
Department of Forest Ecology, P.O. Box 24, FIN-00014 University of Helsinki, Finland
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ei.tietoa@nn.oo
- Vasander, Sähköposti: ei.tietoa@nn.oo
- Puhalainen, Sähköposti: ei.tietoa@nn.oo
Volume and mass budgets of blanket peat in the north of Scotland.
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The ground surface was 0.5 m lower under a 22-year-old lodgepole pine (Pinus contorta) plantation than in the adjacent unplanted ride. The peat was much drier beneath the trees than in the ride. The depth of peat under the trees, adjusted so that each layer had the same dry bulk density as the originally equivalent depths in the ride, effectively reversing shrinkage due to drying, was 2 cm greater than our best estimate of its original depth and the depth in the ride was 8 cm greater than in 1966. The original depths, surveyed in 1966 had too large an uncertainty (± 15 cm) for the changes to be significant.
Keywords: Carbon stores, peatland forestry, Pinus contorta
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Anderson,
Forestry Authority, Northern Research Station, Roslin, Midlothian, EH25 9SY, UK
Sähköposti:
ei.tietoa@nn.oo
- Pyatt, Sähköposti: ei.tietoa@nn.oo
- Sayers, Sähköposti: ei.tietoa@nn.oo
- Blackhall, Sähköposti: ei.tietoa@nn.oo
- Robinson, Sähköposti: ei.tietoa@nn.oo
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