For those who did not get any Email invitations, please note, there are two EcolChange affiliated seminars this week in Tartu, held in English. If you cannot join but would like to know more, feel free to contact the presenters directly.
Good luck for the EcolChange presenters and have great discussions.
23.03.2022 at 16:00 in Vanemuise 46 /virtually in MS Teams
Mohit Masta, PhD student
“Partitioning N2O fluxes with help of microbial and isotopic analysis in drained peat”
Peatlands are an important source of nitrous oxide (N2O) emissions, which is a potent greenhouse gas and is also involved in the depletion of stratospheric ozone. Due to the large number of N2O production process it is challenging to trace N2O emissions to the individual source processes. We investigated the effect of different water regimes (dry, intermediately moist and flooded) on N2O emissions via 15N tracing in a microcosm study with well-decomposed nitrogen-rich alluvial fen peat. The isotopic composition of the peat and emitted N2O gas was analysed in combination with qPCR analysis of abundances and diversity of N-cycle functional genes. Bacterial denitrification was the predominant source of N2O emission, followed by nitrification (ammonia oxidation). This was identified by a close relationship between 15N-N2O and 15N-NO3– under flooded (anoxic) and intermediately moist (sub-oxic) treatments and concomitant increases in nirK, nirS and nosZ after the flooding. Hence, we feel that a combined microbial and isotopic analysis approach provides a deeper insight into the N2O production and consumption mechanisms.
If you can’t join physically then the seminar can be joined by using the following link: Koosolekuga liitumiseks klõpsa siin
Botaanika osakonna ja tippkeskuse EcolChange seminar/ Seminar of the Department of Botany and Centre of Excellence EcolChange
24.03.2022 at 14.15 In Oecologicum, J. Liivi 2-127 (in English)
Marina Semtšenko (University of Tartu)
“Functional diversity and local adaptation in grassland plants: consequences for soil functioning and resilience to drought “
Summary: Plant functional traits and their diversity across plant species are known to modify ecosystem functions, such as primary production, carbon storage and nutrient cycling. Do the same principles apply within species? What is the role of evolutionary processes within species for wider ecosystem processes? I will use examples from my published work, as well as preliminary findings, to explore how functional diversity and local adaptation within plant species can impact biotic interactions in grasslands and their adaptive potential to future change.
NB! Vastavalt praegu kehtivatele suunistele peavad kõik seminaril osalejad kandma maski. /
NB! According to the current guidelines, everybody who will participate in the seminar must wear a mask.