Strong sesquiterpene emissions from Amazonian soils

• Autor(a) principal: Bourtsoukidis, Efstratios
• Data de Publicação: 2018
• Outros Autores: Behrendt, Thomas, Yáñez-Serrano, Ana Maria, Hel?en, Heidi, Diamantopoulos, Efstathios, Catão, Elisa Caldeira Pires, Ashworth, Kirsti, Pozzer, Andrea, Quesada, Carlos Alberto, Martins, Demétrius L., Sá, Marta O., Araüjo, Alessandro Carioca de, Brito, Joel F., Artaxo, Paulo, Kesselmeier, Jürgen, Lelieveld, Jos, Williams, Jonathan C.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional do INPA
• Texto Completo: https://repositorio.inpa.gov.br/handle/1/15592
• topic: Oxygen; Ribosome Rna; Rna 16s; Rna 18s; Sesquiterpenes; Volatile Organic Compound; Air-soil Interaction; Biogeochemical Cycle; Dry Season; Emission; Forest Canopy; Isoprenoid; Metabolism; Oxidation; Rainforest; Soil Microorganism; Speciation (chemistry); Canopy; Clinical Evaluation; Ecosystem; Environmental Factor; Field Emission; Humidity; Mass Fragmentography; Microbial Activity; Nonhuman; Prediction; Proton Transfer Reaction Mass Spectrometry; Rna Transcription; Season; Soil; Soil Microflora; Soil Moisture; Spatial Soil Variability; Amazonia

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. © 2018 The Author(s).