Plant and Soil

, Volume 360, Issue 1–2, pp 163–174

Litter VOCs induce changes in soil microbial biomass C and N and largely increase soil CO2 efflux

  • Dolores Asensio
  • Jorge Curiel Yuste
  • Stefania Mattana
  • Àngela Ribas
  • Joan Llusià
  • Josep Peñuelas
Regular Article

Abstract

Aims

We investigated the effects of volatile organic compounds (VOCs) emitted by pine litter, specifically terpenes, on soil microbial biomass carbon and nitrogen and heterotrophic soil respiration under different microclimatic scenarios of water availability and temperature.

Methods

Soil in glass jars (0.6 L headspace) was exposed to pine needle litter, avoiding any physical contact between soils and litter. Treatments were subjected to two moisture levels, control and drought (20 % and 10 % gravimetric soil water content respectively) and to different temperatures (temperature response curve from 5 °C to 45 °C).

Results

In control soils, exposure to litter was associated with a significant decrease in microbial biomass carbon and ninhydrin extractable organic nitrogen, and with a significant increase in heterotrophic respiration (up to 46 %) under optimum temperature (25 °C). Drought, on the other hand, restricted the effects of litter exposure on heterotrophic respiration but exposure to litter was associated with a significant increase in microbial biomass nitrogen. We did not detect significant overall microbial consumption of terpenes in this study.

Conclusions

These results suggest either that other VOCs not measured in the study were being consumed and/or that VOCs emissions were triggering strong changes in the composition and functioning of soil microbial communities. More studies under field conditions are needed to assess the magnitude of litter VOCs effects on carbon and nitrogen cycles.

Keywords

Litter Terpenes VOCs Microbial biomass carbon Microbial biomass nitrogen Fast-growing microbial populations Soil microbial respiration Drought Warming 

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Dolores Asensio
    • 1
  • Jorge Curiel Yuste
    • 2
  • Stefania Mattana
    • 1
  • Àngela Ribas
    • 1
  • Joan Llusià
    • 1
  • Josep Peñuelas
    • 1
  1. 1.Global Ecology Unit CREAF-CEAB-CSIC, Centre for Ecological Research and Forestry Applications, Edifici CUniversitat Autònoma de BarcelonaBarcelonaSpain
  2. 2.Museo Nacional de Ciencias Naturales CSICMadridSpain

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