Strong sesquiterpene emissions from Amazonian soils

Bourtsoukidis, E.; Behrendt, Thomas; Yanez-Serrano, A. M.; Hellen, H.; Diamantopoulos, E.; Catao, Elisa C. P.; Ashworth, K.; Pozzer, A.; Quesada, C. A.; Martins, D. L.; Sa, M.; Araujo, A.; Brito, J.; Artaxo, P.; Kesselmeier, J.; Lelieveld, J.; Williams, J.

doi:10.1038/s41467-018-04658-y

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Strong sesquiterpene emissions from Amazonian soils

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Behrendt, Thomas
Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Catao, Elisa C. P.
Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;

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http://dx.doi.org/10.1038/s41467-018-04658-y
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Citation

Bourtsoukidis, E., Behrendt, T., Yanez-Serrano, A. M., Hellen, H., Diamantopoulos, E., Catao, E. C. P., 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/21.11116/0000-0001-9706-E

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.