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Swedish Research Council (SRC) 2019

Defining the microbial dependence on soil moisture and response to rewetting after drought

Microbial Soil Rewetting Drought

Titre : Defining the microbial dependence on soil moisture and response to rewetting after drought

Date : 1 January 2019–31 December 2021

Identifiant : 2018-01315_Formas

Présentation
Terrestrial ecosystems will be exposed to more extreme drought and rainfall events. This will have a profound effect on the functioning of terrestrial ecosystems. Microbes control decomposition of organic matter (OM) and dominate the terrestrial contribution to the global carbon (C) cycle.

Water availability is a dominant controller ofmicrobial activity. Microbes are also dependent on labile C from plants and on the physical structure of soil, creating important interactions with soil moisture. We will define the microbial moisture dependence during steady state conditions and during the dramatic perturbations induced by rewetting dry soil. We will work in both experimental model systems and in intact ecosystems. This understanding will be incorporated into global C-models. Our specific aims are:To determine the legacy effect of climate on (i) the direct dependence of moisture on microbial processes and (ii) the response of the active microbial community and their functions to rewetting a soil systemTo assess how (a) land-use management and different plant functional types and (b) C-resource availability determined by plant productivity can modulate the microbial tolerance to drought and response to rewetting.To evaluate how soil physical structure affects microbial tolerance to drought and response to rewetting.To develop a mechanistic representation of microbial dependence on moisture derived from 1-3 into (i) conceptual models and (ii) global-scale C models.

Coordination : Lund University

Financement : Formas
Budget : 3,000,000 kr

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Page publiée le 26 août 2023