Soil greenhouse gas emissions from afforested organic soil croplands and cutaway peatlands

The effects of land-use and land-use change on soil greenhouse gas (GHG) fluxes are of concern due to Kyoto Protocol requirements. To quantify the soil GHG-fluxes of afforested organic soils in Finland, chamber measurements of soil CO 2 , CH 4 and N 2 O fluxes were made during the years 2002 to 2005 on twelve organic soil cropland and six cutaway peatland sites afforested 9 to 35 years ago. The annual soil CO 2 effluxes were statistically modelled using soil temperature as the driving variable and the annual CH 4 and N 2 O fluxes were estimated using the average fluxes during the measurement period. Soil CO 2 effluxes on afforested organic soil croplands varied from 207 to 539 g CO 2 -C m -2 a -1 and on cutaway peatlands from 276 to 479 g CO 2 -C m -2 a -1 . Both the afforested organic soil cropland and cutaway peatland sites acted mainly as small sinks for CH 4 ; the annual flux ranged from 0.32 to 0.61 g CH 4 -C m -2 . Afforested organic croplands emitted more N 2 O (from 0.1 to over 3.0 g N 2 O-N m -2 a -1 ) than cutaway peatland sites (from 0.01 to 0.48 g N 2 O-N m -2 a -1 ). Due to the decrease in soil CO 2 efflux, and no change in CH 4 and N 2 O fluxes, afforestation of organic croplands appears to decrease the greenhouse impact of these lands.

[1]  Per Gundersen,et al.  Soil CN ratio as a scalar parameter to predict nitrous oxide emissions , 2005 .

[2]  M. Nilsson,et al.  Fluxes of CO2, CH4 and N2O from drained organic soils in deciduous forests , 2005 .

[3]  T. Laurila,et al.  Annual CO2 exchange of a peat field growing spring barley or perennial forage grass , 2004 .

[4]  K. Regina,et al.  Fluxes of N2O from farmed peat soils in Finland , 2004 .

[5]  P. Martikainen,et al.  Measuring N2O emissions from organic soils by closed chamber or soil/snow N2O gradient methods , 2003 .

[6]  P. Martikainen,et al.  Nitrous oxide emissions from boreal organic soil under different land-use , 2003 .

[7]  P. Martikainen,et al.  Methane fluxes on agricultural and forested boreal organic soils , 2003 .

[8]  P. Martikainen,et al.  CO2 exchange in an organic field growing barley or grass in eastern Finland , 2001 .

[9]  P. Martikainen,et al.  Fluxes of N2O, CH4 and CO2 on afforested boreal agricultural soils , 2001, Plant and Soil.

[10]  E. Tuittila,et al.  Restored cut-away peatland as a sink for atmospheric CO2 , 1999, Oecologia.

[11]  M. G. Messina,et al.  Forest harvesting effects on soil temperature, moisture, and respiration in a bottomland hardwood forest , 1999 .

[12]  C. Kroeze,et al.  Closing the global N2O budget: A retrospective analysis 1500–1994 , 1999 .

[13]  K. Minkkinen,et al.  Effect of forest drainage on the peat bulk density of pine mires in Finland , 1998 .

[14]  Oene Oenema,et al.  Greenhouse gas emissions from farmed organic soils: a review , 1997 .

[15]  P. Martikainen,et al.  The contribution of plant roots to CO2 fluxes from organic soils , 1996, Biology and Fertility of Soils.

[16]  P. Martikainen,et al.  Emissions of CH4, N20 and CO2 from a virgin fen and a fen drained for grassland in Finland , 1995 .

[17]  P. Martikainen,et al.  Temperature and N fertilization effects on methane oxidation in a drained peatland soil , 1994 .

[18]  J. Lloyd,et al.  On the temperature dependence of soil respiration , 1994 .

[19]  S. Kellomäki,et al.  A procedure for generating synthetic weather records in conjunction of climatic scenario for modelling of ecological impacts of changing climate in boreal conditions , 1993 .

[20]  Eville Gorham,et al.  Methane flux from Minnesota Peatlands , 1988 .

[21]  K. Minkkinen,et al.  Tree stand volume as a scalar for methane fluxes in forestry-drained peatlands in Finland , 2007 .

[22]  N. Shurpali,et al.  Heterotrophic soil respiration in forestry-drained peatlands , 2007 .

[23]  E. Tuittila,et al.  Emission factors and their uncertainty for the exchange of CO2, CH4 and N2O in Finnish managed peatlands , 2007 .

[24]  T. Laurila,et al.  Carbon dioxide exchange above a 30-year-old Scots pine plantation established on organic-soil cropland , 2007 .

[25]  P. Martikainen,et al.  Change in fluxes of carbon dioxide, methane and nitrous oxide due to forest drainage of mire sites of different trophy , 2004, Plant and Soil.

[26]  F. Wagner,et al.  Good Practice Guidance for Land Use, Land-Use Change and Forestry , 2003 .

[27]  Per-Erik Jansson,et al.  A coupled model of water, heat and mass transfer using object orientation to improve flexibility and functionality , 2001, Environ. Model. Softw..

[28]  Juha Heiskanen,et al.  Physical properties of afforested former agricultural peat soils in western Finland , 1998 .

[29]  P. Martikainen,et al.  Emissions of N2O and NO and net nitrogen mineralization in a boreal forested peatland treated with different nitrogen compounds , 1998 .

[30]  Unfccc.  Kyoto Protocol to the United Nations Framework Convention on Climate Change , 1997 .

[31]  A. Mosier,et al.  CO2, CH4 and N2O flux through a Wyoming snowpack and implications for global budgets , 1993, Nature.

[32]  S. Kaunisto,et al.  Nutrient stores in old drainage areas and growth of stands. , 1988 .

[33]  T. Saksa,et al.  1970- ja 1980-luvuilla tehtyjen pellonmetsitysten onnistuminen Pohjois-Karjalassa , 1970 .

[34]  Tenho Hynönen.  Turvemaapeltojen metsitystulos Pohjois-Savossa , 1970 .

[35]  J. Hytönen.  Pellonmetsityksen onnistuminen Keski-Pohjanmaalla , 1970 .