Impact of droughts and heavy rain on greenhouse gas emissions and soil microbial communities
Abstract
Our research questions are: • What are the effects of increased drought-rewetting frequencies on soil nutrient cycling and the availability of forest soil organic C? • Will total soil emissions of greenhouse gases be reduced by extended drought periods or will potential pulses during rewetting periods compensate or even outweigh this reduction, thereby leading to increased overall fluxes? • How do soil microbial communities respond to increased frequency and intensity of drying-rewetting cycles in a beech forest? The response of soil emissions of climate-relevant gases to drying and rewetting and the underlying mechanisms are still not well understood. To explain gas pulses after rewetting, a temporary increase of substrate availability has been proposed, which might occur either due to (1) dying of microorganisms during drought or rewetting, (2) release and metabolizing of osmotically active substances such as sugars during rewetting, or (3) breaking of soil aggregates which are physically protecting SOM, thereby making formerly protected substrates available to microorganisms [5, 44-46]. Whereas the first two mechanisms will not alter the size of the actual substrate pool, the disruption of protective bonds and the formation of new surfaces could increase the accessibility of the available substrate, and thus increase total soil emissions of climate-relevant gases. Drought followed by rewetting as well as frost followed by thawing cause strong physical stress for soil aggregates. When dry aggregates are immersed in water, air trapped inside the aggregates is enclosed and cannot diffuse through capillary pores, which increases the internal pressure and finally disrupts the aggregates, thus making formerly occluded organic matter available for microbial decomposition.
Soil Climate Microbiology greenhouse gases
Publikationen
Impact of repeated dry-wet cycles on soil CO2 efflux and extracellular enzyme activities in a beech forest
Autoren: Leitner, S; Zimmermann, M; Holtermann, C; Keiblinger, K; Saronjic, N; Zechmeister-Boltenstern, S Jahr: 2014
Conference & Workshop proceedings, paper, abstract
Impact of repeated dry-wet cycles on soil greenhouse gas emissions, extracellular enzyme activity and nutrient cycling in a temperate forest
Autoren: Leitner, S; Zimmermann, M; Bockholt, J; Schartner, M; Brugner, P; Holtermann, C; Zechmeister-Boltenstern, S Jahr: 2014
Conference & Workshop proceedings, paper, abstract
Impact of droughts and heavy rain on greenhouse gas emissions and soil microbial activities in a beech forest
Autoren: Zechmeister-Boltenstern, S; Leitner, S; Zimmermann, M Jahr: 2014
Conference & Workshop proceedings, paper, abstract
Impact of repeated dry-wet cycles on soil CO2 efflux in a beech forest
Autoren: Leitner, S; Saronjic, N; Kobler, J; Holtermann, C; Zechmeister-Boltenstern, S; Zimmermann, M Jahr: 2015
Conference & Workshop proceedings, paper, abstract
How do soil microbial communities react on droughts and heavy rainfall events?
Autoren: Saronjic, N; Leitner, S; Keiblinger, K; Zechmeister-Boltenstern, S; Zimmermann, M Jahr: 2015
Conference & Workshop proceedings, paper, abstract
Response of Soil Respiration to Repeated Extreme Events in a Temperate Beech Forest in Austria
Autoren: Leitner, S; Kobler, J; Holtermann, C; Saronjic, N; Zechmeister-Boltenstern, S; Zimmermann, M Jahr: 2015
Conference & Workshop proceedings, paper, abstract
Contribution of litter layer to soil greenhouse gas emissions in a temperate beech forest
Autoren: Leitner, S; Sae-Tun, O; Kranzinger, L; Zechmeister-Boltenstern, S; Zimmermann, M Jahr: 2016
Journal articles
Moisture sensitivity of soil respiration in the context of extreme dry-wet events
Autoren: Leitner, S; Kobler, J; Zimmermann, M; Zechmeister-Boltenstern, S Jahr: 2016
Conference & Workshop proceedings, paper, abstract
Linking NO, N2O and CO2 emission peaks to the mobilization of mineral N upon rewetting of dry soil
Autoren: Leitner, S; Homyak, PM; Blankinship, JC; Eberwein, J; Jenerette, D; Zechmeister-Boltenstern, S; Schimel, JP Jahr: 2016
Conference & Workshop proceedings, paper, abstract
Response of soil microbial communities to droughts and heavy rainfall events
Autoren: Saronjic N, Leitner S, Keiblinger K, Zechmeister-Boltenstern S, Zimmermann M Jahr: 2016
Conference & Workshop proceedings, paper, abstract
Pulsed responses of soil-atmosphere CO2, CH4 and N2O fluxes to extreme rewetting events
Autoren: Leitner, S; Díaz-Pinés, E; Zechmeister-Boltenstern, S Jahr: 2018
Conference & Workshop proceedings, paper, abstract
Project staff
Eugenio Diaz-Pines
Priv.-Doz. Dr. Eugenio Diaz-Pines
eugenio.diaz-pines@boku.ac.at
Tel: +43 1 47654-91120
Project Leader
06.02.2017 - 31.12.2017
Michael Zimmermann
Priv.-Doz. Dipl.phil.-nat.Geogr. Dr.sc.nat. Michael Zimmermann
michael.zimmermann@boku.ac.at
Project Leader
01.03.2014 - 05.02.2017
Katharina Keiblinger
Priv.-Doz. Dipl.-Ing. Dr. Katharina Keiblinger
katharina.keiblinger@boku.ac.at
Tel: +43 1 47654-91141
Project Staff
01.03.2014 - 31.12.2017
Sophie Zechmeister-Boltenstern
Univ.Prof. Dr.phil. Sophie Zechmeister-Boltenstern
sophie.zechmeister@boku.ac.at
Tel: +43 1 47654-91111
Project Staff
01.03.2014 - 31.12.2017