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Feedback interactions between needle litter decomposition and rhizosphere activity.

Jens-Arne Subke1, Volker Hahn, Giovanna Battipaglia

  • 1Department of Environmental Sciences, Second University of Naples, Via Vivaldi 43, 81100 Caserta, Italy. jens.subke@unina2.it

Oecologia
|March 26, 2004
PubMed
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Litter decomposition and rhizosphere activity positively influence each other in Norway spruce forests. Girdling trees reduced soil CO2 efflux, while litter addition stimulated soil respiration and microbial activity.

Area of Science:

  • Forest ecology
  • Soil science
  • Biogeochemistry

Background:

  • Aboveground litter decomposition and rhizosphere activity are key soil processes.
  • Understanding their interactions is crucial for forest carbon cycling.
  • Forest girdling can alter resource availability and soil conditions.

Purpose of the Study:

  • To investigate the interactions between aboveground litter decomposition and rhizosphere activity.
  • To determine the effects of forest girdling and litter addition on soil CO2 efflux.
  • To partition soil respiration into contributions from litter and native soil organic matter.

Main Methods:

  • Experimental design with labelled litter (delta13C) and forest girdling in a Norway spruce stand.
  • Four treatment combinations: girdled/litter (GL), girdled/no litter (GNL), not girdled/litter (NGL), not girdled/no litter (NGNL).

Related Experiment Videos

  • Monthly sampling of soil CO2 efflux and delta13C of respired CO2; soil biological analysis (microbial and fungal biomass).

    • Main Results:

    • Forest girdling significantly reduced soil CO2 efflux, particularly in the GNL treatment.
    • Litter addition increased soil CO2 efflux, with greater litter-derived flux in non-girdled plots (NGL).
    • A significant positive feedback between litter decomposition and rhizosphere activity was observed, indicated by increased soil respiration and microbial biomass in NGL plots.

    Conclusions:

    • Litter decomposition and rhizosphere activity exhibit mutual positive feedbacks in Norway spruce forests.
    • Rhizosphere activity plays an active role in soil priming effects.
    • Changes in carbon input affect fungal community structure, potentially shifting towards saprotrophic dominance.