EGU23-357, updated on 12 Apr 2023
EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Is priming influenced more by in situ or incubation temperatures? Evidence from a 1500 m elevation gradient in the Amazon

Angela Katherine Martin Vivanco1, Outi-Maaria Sietiö1,2, Aino Seppänen1, Bruno Glaser3, Oona Uhlgren1, Kevin Mganga1,4, Subin Kalu1, Andrew Nottingham5, and Kristiina Karhu1
Angela Katherine Martin Vivanco et al.
  • 1Helsinki University, Forest Sciences, Helsinki, Finland (
  • 2Current address: Häme University of Applied Sciences, 13101 Hämeenlinna, Finland
  • 3University Halle - Martin-Luther, Faculty of Natural Sciences III, 06120 Halle, Germany
  • 4Current address: Utrecht University, Copernicus Institute of Sustainable Development, Utrecht, Netherlands
  • 5University of Leeds, School of Geography, LS2 9JT Leeds, United Kingdom


Growing attention has been paid to the significance of microbial metabolism for soil carbon (C) and nutrient cycle as well as their feedback effects on global warming. The estimated annual release of carbon dioxide from soil microbial respiration is 60 petagrams, and because aged native soil organic matter (SOM) has higher temperature sensitivity, the anticipated warming is expected to speed up its C release. Warming might increase litter and root exudate C inputs to hasten the decomposition of older SOM through priming effects. Microorganisms, however, have a rapid rate of growth and turnover and the new SOC formation from labile C inputs may be able to partly counteract the C losses through primed SOM decomposition. We are examining how temperature and the availability of C and nutrients affect the size and direction of priming effects. We conducted an incubation experiment on intact soil cores collected from altitudes ranging from 1500 to 3050 m a.s.l, and that were part of the Kosñipata gradient in the Peruvian Amazon. We incubated the soils for seven months, at two different temperatures to evaluate the impact of temperature, on the magnitude of priming effect caused by added 13C-labeled glucose, which was used as a model compound for labile root derived C inputs. At the end of the incubation, we determined the amount of 13C integrated into the microbial biomass and amino sugars, as well as the 13C remaining in bulk SOM.


Soil organic carbon, Priming effect, Soil respiration, Microbial residues, Elevational (altitudinal) gradient, Amazon

How to cite: Martin Vivanco, A. K., Sietiö, O.-M., Seppänen, A., Glaser, B., Uhlgren, O., Mganga, K., Kalu, S., Nottingham, A., and Karhu, K.: Is priming influenced more by in situ or incubation temperatures? Evidence from a 1500 m elevation gradient in the Amazon, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-357,, 2023.

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