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Research article - Peer-reviewed, 2022

Long-term ley and manure managements have consistent effects on microbial functional profiles and organic C groups across soils from a latitudinal gradient

Shi, Andong; Nunan, Naoise; Figueira, Joao; Herrmann, Anke M.; Wetterlind, Johanna

Abstract

Soil organic matter (SOM) is important in maintaining soil fertility and other ecosystem functions. Yet, land management in intensive agriculture has caused SOM level to decrease, with knock-on effects for soil fertility and quality. Therefore, land management options that ensure that SOM is not depleted and that soil functions are better sustained are of increasing interest. However, there is limited knowledge on how different land managements affect the composition of SOM and associated microbial functional profiles. Twelve long-term field experiments, covering a wide range of climatic zones and soil types, were selected in Sweden. They focused on the role of combining ley in crop rotations with the manure application (livestock farm), as opposed to the management without ley and receiving only inorganic fertilizer (arable farm). In ten out of the 12 study sites, livestock farm management tended to have higher proportions of aliphatic and double bonded C groups, as estimated by mid-infrared spectroscopy. This was further confirmed by C-13 NMR analysis, which found greater proportions of O-alkyl and di-O-alkyl groups and less aromatic C in livestock farm than arable farm management in five of the eight sites analyzed. The changes in SOM composition were reflected in microbial functional profiles across many sites: soils from livestock farm management utilized more carbohydrates and amino acids, while polymer and aromatic compounds were associated with arable farm management. Overall, shifts in both microbial functional profiles and SOM composition showed great consistency across geographical and climatic zones. Livestock farm management maintained higher levels of microbial functional diversity and were associated with higher proportions of "reactive" C functional groups. Our investigation demonstrates that livestock farm management could maintain soil fertility over the long-term via the changes in SOM composition and the regulation of microbial functional profiles.

Keywords

DRIFT; Microbial functional diversity; Mid-infrared spectroscopy; Latitudinal gradient; Ley in crop rotation; Livestock farm management; Long-term experiment; C-13 solid-state CP; MAS NMR

Published in

Agronomy for Sustainable Development
2022, volume: 42, article number: 107
Publisher: SPRINGER FRANCE

Authors' information

Shi, Andong
Swedish University of Agricultural Sciences, Department of Soil and Environment
Swedish University of Agricultural Sciences, Department of Soil and Environment
Sorbonne Université
Figueira, Joao
SciLifeLab
Swedish University of Agricultural Sciences, Department of Soil and Environment
Swedish University of Agricultural Sciences, Department of Soil and Environment

UK√Ą Subject classification

Soil Science
Environmental Sciences related to Agriculture and Land-use

Publication Identifiers

DOI: https://doi.org/10.1007/s13593-022-00837-w

URI (permanent link to this page)

https://res.slu.se/id/publ/119997