Reference : The legacy of mixed planting and precipitation reduction treatments on soil microbial...
Scientific journals : Article
Life sciences : Phytobiology (plant sciences, forestry, mycology...)
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/224890
The legacy of mixed planting and precipitation reduction treatments on soil microbial activity, biomass and community composition in a young tree plantation
English
Hicks, L. C.* [> >]
Rahman, Md Masudur* mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Ecologie végétale et microbienne >]
Carnol, Monique mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Ecologie végétale et microbienne >]
Verheyen, Kris [> >]
Rousk, J [> >]
* These authors have contributed equally to this work.
2018
Soil Biology and Biochemistry
Elsevier
124
227-235
Yes (verified by ORBi)
International
0038-0717
1879-3428
United Kingdom
[en] plant diversity ; soil carbon mineralization ; soil decomposer ecology ; bacterial and fungal growth ; precipitation manipulation ; temperate forest ecosystems
[en] Drought events are expected to increase as a consequence of climate change, with the potential to influence both plant and soil microbial communities. Mixed planting may be an option to mitigate drought stress to plants, however, the extent to which mixed planting mitigates the indirect effect of drought (reduced plant-derived carbon input) on soil microorganisms remains unknown. Using soils from a young experimental plantation in Central Europe, we investigated whether mixed planting (oak monoculture, and oak admixed with 1–3 other tree species) under simulated drought (50% precipitation reduction for 2 years) influenced soil microbial activity, biomass and community composition. To focus on legacy effects - i.e. indirect effects mediated by plant composition and a history of drought, rather than direct effects of reduced water availability - soils were measured at a standardised moisture content (28±1% water holding capacity). Rates of bacterial growth and respiration were lower in soils with a legacy of drought. In contrast, fungal growth was not affected by a history of drought, suggesting that fungi were less adversely affected by reduced plant-input during drought, compared to bacteria. The effect of drought on the fungal-to-bacterial growth ratio was influenced by mixed planting, leading to a disproportionate decrease in bacterial growth in drought-exposed soils under oak monoculture than when oak was admixed with two or three different tree species. The presence of a particular tree species (with specific functional traits) in the admixture, rather than increased tree richness per se, may explain this response. Microbial biomass parameters, reflecting both the direct and indirect effects of past drought conditions, were consistently lower in drought-exposed soils than controls. While bacteria were more sensitive to the indirect effect of drought than fungi, the biomass concentrations suggested that the direct effect of reduced moisture affected both groups similarly. Overall, our findings demonstrate that drought can have lasting effects on microbial communities, with consequences for microbial function. Results also suggest that admixing oak with other tree species may alleviate the drought-legacy effect on bacteria and increase tolerance to future drought.
Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; COST Action FP1305 BioLink- Linking belowground biodiversity and ecosystem function in European forests ; Crafoord Foundation (grant no. 20150561) ; Swedish Research Council Formas (grant no. 941-2015-270) ; Swedish Research Council Vetenskapsrådet (grant no. 2015-04942)
FORBIO Climate- Adaptation potential of biodiverse forests in the face of climate change
Researchers
http://hdl.handle.net/2268/224890
10.1016/j.soilbio.2018.05.027
https://authors.elsevier.com/sd/article/S0038071718301834

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