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Soil carbon sequestration under Miscanthus x giganteus - Jesko Zimmermann

Soil carbon sequestration under Miscanthus x giganteus - Jesko Zimmermann






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    Soil carbon sequestration under Miscanthus x giganteus - Jesko Zimmermann Soil carbon sequestration under Miscanthus x giganteus - Jesko Zimmermann Presentation Transcript

    • Soil carbon sequestration under Miscanthus x giganteus A large scale survey Jesko Zimmermann Jens Dauber Michael B. Jones
    • MiscanthusMiscanthus x giganteus• Ligno-cellulosic or „second generation“ bioenergy crop• Rhizomatous perennial grass with a C4 photosynthesis pathway• Originates in Asia (tropics and subtropics)• Remarkable adaptability to cool temperate climates• Introduction subsidised in IrelandSoil carbon sequestration potential due to physiological features and management practices Picture: Jens Dauber
    • Research questionsResearch on carbon sequestration mainly on experimental fields, however differences can be expected in commercial plotsThis study is focused on commercial large-scale Miscanthus fields in south east Ireland, looking at:• Soil carbon sequestration• Initial soil carbon loss• What is influencing the processes? Picture: Susannah Cass
    • Regional-scale study
    • Materials & Methods Sampling Nested sampling design A number of soil cores taken at three subplots in a Miscanthus field and an adjacent control site representing the former land-use Cores divided into three depth and bulked over the sub plot. Additional cores taken for bulk density
    • Materials & Methods Analyses The bulked samples were processed in the lab and following measurements were taken: Total organic carbon 13C/12C stable isotope ratio to determine the Miscanthus-derived carbon (13C natural abundance method) Soil bulk density, particle size distribution, and pH
    • SOC [Mg ha-1] SOC [Mg ha-1] -10.00 0.00 10.00 20.00 30.00 40.00 -10.00 0.00 10.00 20.00 30.00 40.00 Control Control 10 10 Miscanthus Miscanthus Control ControlDepth [cm] Depth [cm] 20 20 Miscanthus Miscanthus Control Control C3-derived carbon C4-derived carbon 30 30 Miscanthus Miscanthus Tillage GrasslandAfter Zimmermann et al., (2012) Global Change Biology Bioenergy, Vol. 4, Issue 4.
    • Field-scale study Picture: Susannah Cass
    • MG14 TCD_2_1Average patch area 4.357 m2 3.710 m2Standard deviation 8.702 25.245No. Patches 901 1243Sum of patch area 0.393 ha 0.461 haOverall field size 4.390 ha 3.982 haShare of field 8.95 % 11.58 % Zimmermann et al. (in prep.)
    • Farm Area [m2] SD Radius [m] SDMT3 8.672 6.287 1.519 0.691MT5 8.151 4.111 1.570 0.372MT6 10.595 6.028 1.772 0.496MG11 18.185 14.109 2.233 0.923MG18 4.329 1.965 1.146 0.264MG20 10.488 6.335 1.751 0.537
    • MG11 MG18 MG20 Farm MT3 High MT5 Medium MT6 Low-50 -40 -30 -20 -10 0 Difference to area of a non-patch field [%] Zimmermann et al. (in prep.)
    • Miscanthus-derived carbon [Mg ha-1]-0.50 0.50 1.50 2.50 -0.50 0.50 1.50 2.50 10 10 20 20 High density 30 Open patch 30 Tillage Grassland Zimmermann et al. (in prep.)
    • Farm scale
    • High MT6_2 Mean MT6_1 Low MT5 MT3 MG20 MG18 MG11-40 -30 -20 -10 0 Difference in Miscanthus-derived carbon to a no-patch field [%]
    • ConclusionsMeasurable soil carbon sequestration even 2 to 3years after planting MiscanthusNo significant loss of soil organic carbon due toplantationHigh variability between farmsCrop patchiness has significant impact on yield andsoil carbon sequestration
    • Acknowledgements David Bourke Susannah Cass Kees-Jan van Groenigen Kate HarteBas Boots The Simbiosys TeamKatie WennigCatherine Fontana The land-owners for theirZeno Wong kind permission to work onMaximilian von Sternburg their landsErin Jo TiedekenSarah Kimberley The EPA for funding the project