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Soil management intensity shifts microbial catabolic profiles across a range of European long-term field experiments

Bongiorno, Giulia; Bünemann, Else K.; Brussaard, Lijbert; Mäder, Paul; Oguejiofor, Chidinma U. and de Goede, Ron G. M. (2020) Soil management intensity shifts microbial catabolic profiles across a range of European long-term field experiments. Applied Soil Ecology, 154, p. 103596.

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Online at: https://www.sciencedirect.com/science/article/pii/S0929139319314258

Summary

Assessing soil microbial functionality has the potential to reveal meaningful effects of soil management on soil processes influencing soil quality. We used MicroResp™ to assess microbial respiration upon the addition of six carbon substrates (glucose, alanine, aminobutyric acid, N-acetyl glucosamine, alpha-ketoglutaric acid, and lignin). From this, we calculated the multiple substrate induced respiration (MSIR), the microbial catabolic profile expressed as absolute and relative utilization rate, and the Shannon microbial functional diversity index (H′). We tested the effect of tillage (reduced vs. conventional) and organic matter addition (high vs. low) on these microbial parameters in soil from 10 European long-term field experiments (LTEs), and investigated their relationships with labile organic carbon fractions and various soil parameters linked to soil functions. Reduced tillage and high organic matter input increased MSIR compared to conventional tillage and low organic matter input. In addition, reduced tillage resulted in a small but significant increase in functional diversity compared to conventional tillage. An increase in soil management intensity (CT-Low > CT-High > RT-Low > RT-High) was associated with lower utilization of all the substrates expressed as absolute utilization rate, and a proportionately higher utilization of alpha-ketoglutaric acid compared to the other substrates. More intensive management systems also showed lower soil quality as measured by various soil parameters, in particular total and labile organic carbon, basal respiration, and microbial biomass nitrogen. The present work shows for the first time the key role of labile organic carbon, as affected by soil management, in determining microbial functional diversity. Aggregating results from 10 European arable LTEs, making use of a comprehensive dataset, MicroResp™ showed that reduced tillage and increased organic matter addition created a more favourable habitat for the microbial community to utilize different carbon substrates and, thereby, the potential for nutrient cycling.


EPrint Type:Journal paper
Keywords:Community level physiological profiling, MicroResp™, Tillage, Organic matter addition, Microbial functional diversity, Structural equation modelling, Department of Soil Sciences, Nutrient Management & Symbiosis, FiBL10092, iSQAPER, FiBL1009203, Abacus
Agrovoc keywords:
LanguageValueURI
Englishtillagehttp://aims.fao.org/aos/agrovoc/c_7771
Englishorganic matterhttp://aims.fao.org/aos/agrovoc/c_5387
Subjects: Soil > Soil quality
Crop husbandry > Soil tillage
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil > Tillage > Reduced Tillage
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil > Soil quality
Netherlands > Wageningen University & Research (WUR)
H2020 or FP7 Grant Agreement Number:635750
DOI:10.1016/j.apsoil.2020.103596
Related Links:https://www.fibl.org/en/themes/projectdatabase/projectitem/project/1014.html
Deposited By: Mäder, Paul
ID Code:38667
Deposited On:01 Dec 2020 11:49
Last Modified:21 Jan 2021 16:47
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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