Plant and Soil

, Volume 338, Issue 1–2, pp 83–97 | Cite as

Quality and decomposition in soil of rhizome, root and senescent leaf from Miscanthus x giganteus, as affected by harvest date and N fertilization

  • Norbert Amougou
  • Isabelle Bertrand
  • Jean-Marie Machet
  • Sylvie Recous
Regular Article


To predict the environmental benefits of energy crop production and use, the nature and fate of biomass residues in the soil need to be quantified. Our objective was to quantify Miscanthus x giganteus biomass recycling to soil and to assess how harvesting time and N fertilization affect their characteristics and subsequent biodegradability. The quantification of aerial and belowground biomass and their sampling were performed on 2- and 3-year-old Miscanthus stands, either fertilized with 120 kg N ha−1 year−1 or not fertilized, in autumn (maximal biomass production) and winter (maturity). Plant biomass was chemically characterized (total sugars, Klason lignin, C/N) and incubated in optimum decomposition conditions (15°C, −80 kPa) for 263 days, for C and N mineralization. Accumulation of carbon in rhizomes and roots was 7.5 to 10 t C ha−1 and represented about 50% of total plant biomass C. Senescent leaves represented about 1.5 t C ha−1 year−1. All residues, especially the roots, had high lignin contents, while the rhizomes also had a high soluble content due to their nutrient storage function. The C mineralization rates were closely related to the chemical characteristics of the residue, higher sugar and lower lignin contents leading to faster decomposition, as observed for rhizomes.


Carbon Energy crop Litter quality Miscanthus Mineralization Nitrogen 



This work was funded by INRA and the Region Champagne Ardenne who provided the doctoral grant to N. Amougou, and the Region Picardie (MISQUAL project AAP07-52). The authors thank S. Cadoux and M. Preudhomme (INRA Agro-Impact) for field experiment management and for providing the plant material and F. Millon, S. Millon and G. Alavoine for their technical assistance.


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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Norbert Amougou
    • 1
    • 2
  • Isabelle Bertrand
    • 1
    • 2
  • Jean-Marie Machet
    • 3
  • Sylvie Recous
    • 1
    • 2
  1. 1.INRA, UMR614 FAREReimsFrance
  2. 2.URCA, UMR614 FAREReimsFrance
  3. 3.INRA, US1158 Agro-ImpactLaonFrance

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