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Dynamics of fungal and bacterial groups and their carbon sources during the growing season of maize in a long-term experiment

Shahbaz, Muhammad and Kätterer, Thomas and Thornton, Barry and Börjesson, Gunnar (2020). Dynamics of fungal and bacterial groups and their carbon sources during the growing season of maize in a long-term experiment. Biology and Fertility of Soils. 56 , 759-770
[Journal article]

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Abstract

The relative contribution of different microbial groups to soil organic matter (SOM) turnover and utilisation of rhizodeposits during a cropping season has remained largely unknown. We used a long-term field experiment (started in 1956), in which C3 crops were replaced with C4 silage maize in 2000, to investigate dynamics of fungi and bacterial groups and their utilisation of 'young-C4' and 'old-C3' SOM-derived resource every second week during the cropping season (June-Oct). Treatments include bare fallow, unfertilised, fertilised with mineral N and fertilised with farmyard manure (FYM) addition. Extracted soil phospholipid fatty acids (PLFAs) were pooled into Gram-positive, Gram-negative bacteria and fungi (18:2 omega 6,9) groups and their delta C-13 values determined. Total PLFAs amount correlated to the SOM contents (highest in FYM) and increased over the cropping season in N-fertilised and FYM treatments. As a result of a peak in plant growth during a period with frequent rain events in August, delta C-13 of total PLFAs significantly increased from - 23.8 to - 21.6 parts per thousand and - 26.1 to - 24.7 parts per thousand, in N-fertilised and FYM addition, respectively. This clearly indicated a shift in microbial utilisation from old to young SOM sources, which was linked to increased soil moisture contents and fungal biomass. The abundance of Gram-positive increased and that of Gram-negative bacteria decreased until August and vice versa thereafter. The mean delta C-13 values of individual microbial groups were highest in fungi (corresponding to their seasonal biomass variation) followed by Gram-positive and Gram-negative bacteria. The results clearly demonstrated that irrespective of fertilisation type, fungi were the main players in seasonal SOM dynamics and were strongly influenced by soil moisture and phenological stage of the maize (i.e. rhizodeposition). Disentangling these microbial controls on C resources utilisation will be crucial for understanding C cycling during a cropping season or on an ecosystem scale.

Authors/Creators:Shahbaz, Muhammad and Kätterer, Thomas and Thornton, Barry and Börjesson, Gunnar
Title:Dynamics of fungal and bacterial groups and their carbon sources during the growing season of maize in a long-term experiment
Year of publishing :2020
Volume:56
Page range:759-770
Number of Pages:12
Publisher:Springer
ISSN:0178-2762
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:C3, C4 vegetation shift, Long-term fertilisation, Microbial groups, PLFAs, Seasonal changes, Soil organic matter
URN:NBN:urn:nbn:se:slu:epsilon-p-105147
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105147
Additional ID:
Type of IDID
DOI10.1007/s00374-020-01454-z
Web of Science (WoS)000521860200002
ID Code:17396
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment

(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:04 Sep 2020 07:02
Metadata Last Modified:04 Sep 2020 07:02

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