Microbial community structure mediates response of soil C decomposition to litter addition and warming

Creamer, CA, De Menezes, AB, Krull, E, Sanderman, J, Newton-Walters, R and Farrell, M 2015, 'Microbial community structure mediates response of soil C decomposition to litter addition and warming' , Soil Biology and Biochemistry, 80 , pp. 175-188.

[img] PDF - Published Version
Restricted to Repository staff only

Download (1MB) | Request a copy


Microbial activity has been highlighted as one of the main unknowns controlling the fate and turnover of soil organic matter (SOM) in response to climate change. How microbial community structure and function may (or may not) interact with increasing temperature to impact the fate and turnover of SOM, in particular when combined with changes in litter chemistry, is not well understood. The primary aim of this study was to determine if litter chemistry impacted the decomposition of soil and litter-derived carbon (C), and its interaction with temperature, and whether this response was controlled by microbial community structure and function. Fresh or pre-incubated eucalyptus leaf litter (13C enriched) was added to a woodland soil and incubated at 12, 22, or 32 �C. We tracked the movement of litter and soilderived C into CO2, water-extractable organic carbon (WEOC), and microbial phospholipids (PLFA). The litter additions produced significant changes in every parameter measured, while temperature, interacting with litter chemistry, predominately affected soil C respiration (priming and temperature sensitivity), microbial community structure, and the metabolic quotient (a proxy for microbial carbon use efficiency [CUE]). The direction of priming varied with the litter additions (negative with fresh litter, positive with pre-incubated litter) and was related to differences in the composition of microbial communities degrading soil-C, particularly gram-positive and gram-negative bacteria, resulting from litter addition. Soil-C decomposition in both litter treatments was more temperature sensitive (higher Q10) than in the soil-only control, and soil-C priming became increasingly positive with temperature. However, microbes utilizing soil-C in the litter treatments had higher CUE, suggesting the longer-term stability of soil-C may be increased at higher temperature with litter addition. Our results show that in the same soil, the growth of distinct microbial communities can alter the turnover and fate of SOM and, in the context of global change, its response to temperature.

Item Type: Article
Schools: Schools > School of Environment and Life Sciences
Journal or Publication Title: Soil Biology and Biochemistry
Publisher: Elsevier
ISSN: 0038-0717
Related URLs:
Funders: CSIRO Office of the Chief Executive (OCE)
Depositing User: AB De Menezes
Date Deposited: 09 Dec 2015 12:17
Last Modified: 15 Feb 2022 20:04
URI: https://usir.salford.ac.uk/id/eprint/37410

Actions (login required)

Edit record (repository staff only) Edit record (repository staff only)


Downloads per month over past year