0000000000375861
AUTHOR
Ilonka Engelhardt
Effects of precipitation regime on soil bacterial and fungal activity upon rewetting of a plant-soil system using 18O-SIP: depth matters
EASPEBIOmEDOCT INRA; Climate change is predicted to affect not only the amount but also the temporal distribution of rain. Changes in frequency and amplitude of rain events, likely shape the activity of plants and soil microbes. Fluctuating water conditions will differ with soil depth between precipitation patterns, affecting plant growth and may result in differential microbial response upon rewetting. Our objective was to investigate, in plant-soil systems, the response of the metabolically active microbial communities to a rewetting event and to which extent this was modulated by 1) soil depth and 2) precipitation legacy. Wheat planted in soil mesocosms were subjected to frequent or infr…
Legacy effects of contrasting water and N-availability patterns on plant-microbial response to rewetting
Shifts in frequency and magnitude of rain events may affect plant physiology and soil microbial activity. We aimed to determine how precipitation history shapes the response dynamics of soil microbial communities to rewetting, as well as plant-microbial competition for N, and how the N status of the system may modulate the effects of precipitation regime. The legacy effects of 12 weeks of contrasting precipitation and N inputs was assessed in wheat mesocosms. The legacy effects on the response to rewetting of potentially active (rRNA-based) bacterial and fungal communities was then documented over 29h, by sequencing phylogenetic marker genes, and following the dynamics of plant-microbial co…
Legacy effects of contrasting water and N-availability patterns on plantmicrobial response to rewetting
National audience; Introduction. Shifts in the frequency and magnitude of rain events (precipitation regime) associated with climate change may affect plant morphological and physiological strategies as well as soil microbial activity.Objectives. The objective of this study was to determine i) how precipitation history shapes the response dynamics of soil bacterial and fungal communities to rewetting, as well as plant-microbial competition for N, and ii) how the N status of the system may modulate the effect of precipitation regime.Materials & methods. The legacy effects of 12 weeks of contrasting precipitation (frequent or infrequent watering, equal total water input) and N inputs was asse…
Réponse des interactions plante-sol aux régimes de précipitations
Water availability governs terrestrial nutrient cycles by impacting the functioning of both plants and of soil microorganisms. The predicted changes in precipitation patterns (i.e. the magnitude and frequency of precipitation events) associated with climate change, will thus likely have important consequences on ecosystem functioning. Dry and seasonally dry ecosystems are particularly vulnerable to changes in precipitation patterns, as they are already constrained to a large extent by water availability. However, more mesic systems may also experience dry periods that may impact plant-soil functions. In this thesis, experiments in soil-only systems and plant-soil systems were used to gain i…
Effects of precipitation regime on soil bacterial and fungal activity upon rewetting of a plant-soil system using 18O-SIP : depth matters
Climate change is predicted to a ect not only the amount but also the temporal distribu- tion of rain. Changes in frequency and amplitude of rain events, i.e. precipitation patterns, likely shape the activity of plants and soil microbes. Fluctuating water conditions will dier with soil depth between precipitation patterns, a ecting plant growth and may result in dierential microbial response upon rewetting. Our objective was to investigate, in plant-soil systems, the response of the metabolically active microbial communities to a rewetting event and to which extent this was modulated 1) by soil depth and 2) by precipitation legacy. Wheat planted in soil mesocosms was grown under controlled …
Effects of precipitation regime and N-availability on the dynamics of plant-microbial and soil biogeochemical cycling responses to rewetting
International audience; Introduction. Shifts in the frequency and magnitude of rain events (precipitation regime) associated with climate change may affect plant morphological and physiological strategies as well as soil microbial activity. Objectives. The objective of this study was to determine i) how precipitation history shapes the response dynamics of soil bacterial and fungal communities to rewetting, as well as plant-microbial competition for N, and ii) how the N status of the system may modulate the effect of precipitation regime. Materials & methods. The legacy effects of 12 weeks of contrasting precipitation (frequent or infrequent watering, equal total water input) and N inputs w…
Effects of precipitation regime on soil microbial activity upon rewetting of a plant-soil system
Climate change is predicted to a ect not only the amount but also the temporal distribu- tion of rain. Changes in frequency and amplitude of rain events, i.e. precipitation patterns, likely shape the activity of plants and soil microbes. Fluctuating water conditions will dier with soil depth between precipitation patterns, a ecting plant growth and may result in dierential microbial response upon rewetting. Our objective was to investigate, in plant-soil systems, the response of the metabolically active microbial communities to a rewetting event and to which extent this was modulated 1) by soil depth and 2) by precipitation legacy. Wheat planted in soil mesocosms was grown under controlled …