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Strong sesquiterpene emissions from Amazonian soils

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Bourtsoukidis,  Efstratios
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Yanez-Serrano,  A M
Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101196

Pozzer,  A.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101057

Kesselmeier,  J.
Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101104

Lelieveld,  J.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101364

Williams,  J.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Bourtsoukidis, E., Behrendt, T., Yanez-Serrano, A. M., Hellen, H., Diamantopoulos, E., Catao, E., et al. (2018). Strong sesquiterpene emissions from Amazonian soils. Nature Communications, 9: 2226. doi:10.1038/s41467-018-04658-y.


Cite as: https://hdl.handle.net/21.11116/0000-0001-A9D6-F
Abstract
The Amazon rainforest is the world’s largest source of reactive volatile isoprenoids to the atmosphere. It is generally assumed that these emissions are products of photosynthetically driven secondary metabolism and released from the rainforest canopy from where they influence the oxidative capacity of the atmosphere. However, recent measurements indicate that further sources of volatiles are present. Here we show that soil microorganisms are a strong, unaccounted source of highly reactive and previously unreported sesquiterpenes (C15H24; SQT). The emission rate and chemical speciation of soil SQTs were determined as a function of soil moisture, oxygen, and rRNA transcript abundance in the laboratory. Based on these results, a model was developed to predict soil–atmosphere SQT fluxes. It was found SQT emissions from a Terra Firme soil in the dry season were in comparable magnitude to current global model canopy emissions, establishing an important ecological connection between soil microbes and atmospherically relevant SQTs.