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Background and aims <p>Biogenic volatile organic compounds (BVOCs) play numerous ecological functions as they account for organism defenses and are drivers of organic matter decomposition, organism development and trophic interactions. BVOCs also act as precursors of secondary organic pollutants. Thus, studying their variability according to climate change is of crucial importance. This research aimed to assess the variability of BVOC emissions from natural forest soil under both natural drought (ND) and amplified drought (AD, ~ 30% rainfall exclusion over 9&#xa0;years), as projected for the Mediterranean region by the end of the century.</p> Methods <p>The experiment took place in a representative and homogenous Mediterranean mixed forest (<i>Pinus halepensis</i> Mill. and <i>Quercus ilex</i> L.) using five different soil surfaces covered by litter under ND and AD conditions in July 2018. BVOCs were collected using a push–pull system, trapped within adsorbent cartridges and analyzed (quantitatively and qualitatively) by GC–MS.</p> Results <p>Forest soil emissions released 184 µgC m<sup>−2</sup>&#xa0;h<sup>−1</sup> under ND but diminished by 84% under AD. Most monoterpenoids and oxygenated compounds were correlated with <i>P. halepensis</i> litter dry mass. Interestingly, sesquiterpenoids were positively corelated to <i>Q. ilex</i> litter while this litter does not possess terpene storage structures.</p> Conclusions <p>The future limited precipitation in the Mediterranean basin will result in the decline of forest soil BVOCs certainly implying a loss of both forest functionality and interaction with the atmosphere.</p> <p>Although litter biomass appeared as&#xa0;a driver of forest soil BVOCs, microorganisms and roots need to be further characterized to better understand their contribution to BVOC fluxes in natural forest soil.</p>

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Contrasting emissions of biogenic volatile organic compounds from soil in a Mediterranean evergreen forest under natural and amplified long-term rain scarcity

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Thibaud Legros,
  • Justine Viros,
  • Caroline Lecareux,
  • Catherine Fernandez,
  • Elena Ormeno

摘要

Background and aims

Biogenic volatile organic compounds (BVOCs) play numerous ecological functions as they account for organism defenses and are drivers of organic matter decomposition, organism development and trophic interactions. BVOCs also act as precursors of secondary organic pollutants. Thus, studying their variability according to climate change is of crucial importance. This research aimed to assess the variability of BVOC emissions from natural forest soil under both natural drought (ND) and amplified drought (AD, ~ 30% rainfall exclusion over 9 years), as projected for the Mediterranean region by the end of the century.

Methods

The experiment took place in a representative and homogenous Mediterranean mixed forest (Pinus halepensis Mill. and Quercus ilex L.) using five different soil surfaces covered by litter under ND and AD conditions in July 2018. BVOCs were collected using a push–pull system, trapped within adsorbent cartridges and analyzed (quantitatively and qualitatively) by GC–MS.

Results

Forest soil emissions released 184 µgC m−2 h−1 under ND but diminished by 84% under AD. Most monoterpenoids and oxygenated compounds were correlated with P. halepensis litter dry mass. Interestingly, sesquiterpenoids were positively corelated to Q. ilex litter while this litter does not possess terpene storage structures.

Conclusions

The future limited precipitation in the Mediterranean basin will result in the decline of forest soil BVOCs certainly implying a loss of both forest functionality and interaction with the atmosphere.

Although litter biomass appeared as a driver of forest soil BVOCs, microorganisms and roots need to be further characterized to better understand their contribution to BVOC fluxes in natural forest soil.