Precipitation patterns and N availability alter plant-soil microbial C and N dynamics

Shifts in the frequency and magnitude of rain events (precipitation patterns) associated with climate change may impact ecosystem nitrogen and carbon cycling through effects on plant physiology and soil microbial activity. Here, we determined how the combination of temporal irrigation distribution a...

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Bibliographic Details
Published in:Plant and soil 2021-09, Vol.466 (1-2), p.151-163
Main Authors: Engelhardt, Ilonka C., Niklaus, Pascal A., Bizouard, Florian, Breuil, Marie-Christine, Rouard, Nadine, Deau, Florence, Philippot, Laurent, Barnard, Romain L.
Format: Article
Language:English
Subjects:
Agriculture
Analysis
Biological activity
Biomass
Biomedical and Life Sciences
Carbon cycle
Carbon cycle (Biogeochemistry)
Carbon dioxide
Climate change
Climate prediction
Competitiveness
Denitrification
Ecology
Environmental impact
Environmental Sciences
Growth
Irrigation
Life Sciences
Microbial activity
Microcosms
Microorganisms
Nitrification
Nitrogen
Nitrogen cycle
Photosynthesis
Plant biomass
Plant Physiology
Plant Sciences
Precipitation
Precipitation (Meteorology)
Rainfall
Regular Article
Soil dynamics
Soil microorganisms
Soil moisture
Soil Science & Conservation
Temperate zones
Winter wheat
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Summary:Shifts in the frequency and magnitude of rain events (precipitation patterns) associated with climate change may impact ecosystem nitrogen and carbon cycling through effects on plant physiology and soil microbial activity. Here, we determined how the combination of temporal irrigation distribution and N supply affects plant-microbial C and N dynamics in microcosms with winter wheat. First, we investigated legacy effect of 12 weeks of contrasting irrigation distribution (frequent and small versus infrequent and large water inputs) and N inputs (high versus low) on plant biomass, organic and inorganic N pools, and potential nitrification and denitrification rates. Second, we investigated legacy effects of these treatments on C and N fluxes in plants and microbes over 29 h after a rewetting event, using 13 C-CO 2 and 15 N-NH 4 labeling. We found that irrigation distribution and N input led to significant differences in plant responses and soil C input, setting the scene for the rewetting response. Immediately after rewetting, microorganisms outcompeted plants for soil mineral N. However, over time, the net outcome of competition improved for plants regardless of water or N input history. Further, we found that a history of frequent irrigation led to more productive plants (biomass and rate of photosynthesis) and increased their net competitiveness for N over microorganisms. This suggests that the shift toward more extreme fluctuations in soil moisture predicted by climate forecasts for most temperate zones may have negative implications for plant productivity due to altered N dynamics between plants and soil microorganisms.
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-021-05015-7