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Biology and Fertility of Soils

, Volume 39, Issue 3, pp 146–152 | Cite as

Effect of earthworm addition on soil nitrogen availability, microbial biomass and litter decomposition in mesocosms

  • Yelinda Araujo
  • Flavio J. Luizão
  • Eleusa Barros
Original Paper

Abstract

The aim of the study was to determine the effect of adding two tropical earthworm species, Rhinodrilus contortus and Pontoscolex corethrurus, to mesocosms on the availability of mineral N (NH4 + and NO3 concentrations), soil microbial biomass (bio-N), and the decomposition rates of three contrasting leaf litter species, in a glasshouse experiment. The mesocosms were filled with forest soil and covered with a layer of leaf litter differing in nutritional quality: (1) Hevea brasiliensis (C/N=27); (2) Carapa guianensis (C/N=32); (3) Vismia sp., the dominant tree species in the second growth forest (control, C/N= 42); and, (4) a mixture of the former three leaf species, in equal proportions (C/N=34). At the end of the 97-day experiment, the soil mineral N concentrations, bio-N, and leaf litter weight loss were determined. Both earthworm species showed significant effects on the concentrations of soil NO3 (p<0.01) and NH4 + (p<0.05). Bio-N was always greater in the mesocosms with earthworms (especially with R. contortus) and in the mesocosms with leaf litter of H. brasiliensis (6 µg N g−1 soil), the faster decomposing species, than in the other treatments (0.1–1.6 µg N g−1). Thus, earthworm activity increased soil mineral-N concentrations, possibly due to the consumption of soil microbial biomass, which can speed turnover and mineralization of microbial tissues. No significant differences in decomposition rate were found between the mesocosms with and without earthworms, suggesting that experiments lasting longer are needed to determine the effect of earthworms on litter decomposition rates.

Keywords

Earthworms Nitrogen mineralization Litter decomposition process Amazonia 

Notes

Acknowledgements

Funding was provided by projects PNOPG/CNPq 400033/99-2 and PPI 1-3200 INPA. Dr. Ilse Walker is thanked for the use of laboratory facilities in part of the work.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Yelinda Araujo
    • 1
  • Flavio J. Luizão
    • 2
  • Eleusa Barros
    • 2
  1. 1.Instituto Nacional de Investigaciones Agrícolas (INIA-Mérida)Avenida Urdaneta, Edificio del Ministerio de Agricultura y TierrasMéridaVenezuela
  2. 2.National Institute for Research in Amazonia (INPA)ManausBrazil

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