Final published version, 1.85 MB, PDF document
Available under license: CC BY: Creative Commons Attribution 4.0 International License
Final published version
Licence: CC BY: Creative Commons Attribution 4.0 International License
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Strong sesquiterpene emissions from Amazonian soils
AU - Bourtsoukidis, Efstratios
AU - Behrendt, Thomas
AU - Yañez-Serrano, Ana Maria
AU - Hellén, Heidi
AU - Diamantopoulos, Efstathios
AU - Catão, Elisa
AU - Ashworth, Kirsti
AU - Pozzer, Andrea
AU - Quesada, C.A.
AU - Martins, Demétrios
AU - Sá, Marta
AU - Araujo, Alessandro
AU - Brito, Joel
AU - Artaxo, Paulo
AU - Kesselmeier, Jürgen
AU - Lelieveld, Jos
AU - Williams, Jonathan
PY - 2018/6/8
Y1 - 2018/6/8
N2 - 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 through reaction with hydroxyl radicals (OH) and ozone (O3). However, recent volatile organic compound (VOC) budgeting experiments (based on OH reactivity) show that further important sources remain to be discovered. 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. Simulated results compared closely with SQT flux measurements in the field, so a two-year period (2014-2015) was modelled based on in-situ rainfall and soil moisture measurements. It was found SQT emissions from a Terra Firme soil in the dry season were in comparable magnitude to current global model canopy emissions and dominated O3 reactivity on the forest floor, establishing an important ecological connection between soil microbes and atmospherically relevant SQTs.
AB - 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 through reaction with hydroxyl radicals (OH) and ozone (O3). However, recent volatile organic compound (VOC) budgeting experiments (based on OH reactivity) show that further important sources remain to be discovered. 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. Simulated results compared closely with SQT flux measurements in the field, so a two-year period (2014-2015) was modelled based on in-situ rainfall and soil moisture measurements. It was found SQT emissions from a Terra Firme soil in the dry season were in comparable magnitude to current global model canopy emissions and dominated O3 reactivity on the forest floor, establishing an important ecological connection between soil microbes and atmospherically relevant SQTs.
U2 - 10.1038/s41467-018-04658-y
DO - 10.1038/s41467-018-04658-y
M3 - Journal article
VL - 9
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 2226
ER -