http://www.metla.fi/ Latest publications of Finnish Forest Research Institute Metla Mon, 14 May 2012 12:30:02 +0300 http://blogs.law.harvard.edu/tech/rss erkki.kauhanen@metla.fi (Erkki Kauhanen) mika.galkin@metla.fi (Mika Galkin) Publications 3600 rss.pl http://www.metla.fi/img/metlav73x16.gif http://www.metla.fi/julkaisut/index-en.htm en http://www.metla.fi/julkaisut/workingpapers/2012/mwp235.htm http://www.metla.fi/julkaisut/workingpapers/2012/mwp235.htm 2012-05-10T09:00:00+02:00 http://www.metla.fi/julkaisut/workingpapers/2012/mwp225.htm http://www.metla.fi/julkaisut/workingpapers/2012/mwp225.htm 2012-05-03T09:00:00+02:00 http://www.metla.fi/dissertationes/df142.htm http://www.metla.fi/dissertationes/df142.htm 2012-04-25T09:00:00+02:00 http://www.metla.fi/julkaisut/workingpapers/2012/mwp230.htm http://www.metla.fi/julkaisut/workingpapers/2012/mwp230.htm 2012-04-25T09:00:00+02:00 http://www.metla.fi/julkaisut/workingpapers/2012/mwp227.htm http://www.metla.fi/julkaisut/workingpapers/2012/mwp227.htm 2012-04-20T09:00:00+02:00 http://www.metla.fi/julkaisut/workingpapers/2012/mwp231.htm http://www.metla.fi/julkaisut/workingpapers/2012/mwp231.htm 2012-04-04T09:00:00+02:00 http://www.metla.fi/dissertationes/df141.htm http://www.metla.fi/dissertationes/df141.htm 2012-03-30T09:00:00+02:00 http://www.metla.fi/dissertationes/df140.htm http://www.metla.fi/dissertationes/df140.htm 61cm ) was observed to reduce RPEAT and furthermore, in low water level conditions the temperature sensitivity of RPEAT was reduced. These findings suggest that climate change and the associated increase in temperature would have the potential to substantially increase soil C release from drained peatlands. This C release may, however, be constrained, if warming is accompanied by changes in evapotranspiration, precipitation regimes, or the frequency of extreme events (e.g. droughts) that would severely affect WL and surface soil moisture conditions. Changes in environmental conditions following clearfelling caused only small absolute changes in RPEAT. Following clearfelling, a decrease in evapotranspiration raises water table level which in turn decreases the volume of aerated peat layers. Furthermore the soil surface is exposed to direct solar radiation which causes excessive dryness in surface soil. These factors are capable of compensating and overruling the effect of increased soil temperatures on RPEAT following clearfelling. Below the logging residue piles, however, considerable increase in RPEAT was observed. This indicates that human induced forestry activities could potentially cause significant C release from the oldest and largest C stocks in these ecosystems This C release may, however, be avoided if logging residue is removed from the site. Further investigations on longevity of the effect of logging residues on CO2 emissions as well as on the sources of CO2 under logging residues are required to confirm these findings. The estimated RPEAT from the afforested organic soil croplands varied widely between the sites (from 750 to 2000 g CO2 m-2 a-1). It appeared that afforestation has the potential to reduce the extremely high soil CO2 effluxes of actively cultivated peat soils. Despite this, agricultural history has obvious effects on peat properties and observed RPEAT, with the result that these soils remain sources of CO2. ]]> 2012-03-21T09:00:00+02:00 http://www.metla.fi/julkaisut/workingpapers/2011/mwp218.htm http://www.metla.fi/julkaisut/workingpapers/2011/mwp218.htm 2012-02-09T09:00:00+02:00 http://www.metla.fi/dissertationes/df136.htm http://www.metla.fi/dissertationes/df136.htm 2012-01-19T09:00:00+02:00