Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/29026
Title: Determination of Agricultural Impact on Soil Microbial Activity Using δ18OPHCl and Respiration Experiments
Contributor(s): Polain, Katherine  (author)orcid ; Guppy, Christopher  (author)orcid ; Knox, Oliver  (author)orcid ; Lisle, Leanne  (author); Wilson, Brian  (author)orcid ; Osanai, Yui  (author)orcid ; Siebers, Nina (author)
Publication Date: 2018-05-04
DOI: 10.1021/acsearthspacechem.8b00021
Handle Link: https://hdl.handle.net/1959.11/29026
Abstract: Improved understanding of microbial activity and associated nutrient cycling in agricultural systems is required to maximize production while maintaining and improving soil fertility. We compared past and current microbial activity using the stable δ18OP HCl pool and respiration incubations under crop and native systems to a depth of 1 m. Contrary to current understanding, agricultural practices have not decreased microbial activity in our crop system. Differences in average δ18OP HCl signatures between land use systems, indicated higher past microbial activity in the entire soil profile under the crop system (13.7‰) compared to the native system soil profile (11.0‰), while current microbial activity was double under the crop system, especially between 15 and 100 cm. Evenly distributed microbial activity in the top and subsoils of the crop system, as well as an increase of biomass in the native system subsoil, highlight the importance of investigating microbial dynamics beyond the top 0-30 cm of the soil profile. In these relatively dry, carbon and nutrient poor Australian soils, the influence of water is perhaps the key to explaining our results.
Publication Type: Journal Article
Source of Publication: ACS Earth and Space Chemistry, 2(7), p. 683-691
Publisher: American Chemical Society
Place of Publication: United States of America
ISSN: 2472-3452
Fields of Research (FoR) 2008: 070107 Farming Systems Research
050303 Soil Biology
050304 Soil Chemistry (excl. Carbon Sequestration Science)
Fields of Research (FoR) 2020: 410603 Soil biology
410203 Ecosystem function
410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
Socio-Economic Objective (SEO) 2008: 960904 Farmland, Arable Cropland and Permanent Cropland Land Management
970105 Expanding Knowledge in the Environmental Sciences
Socio-Economic Objective (SEO) 2020: 280111 Expanding knowledge in the environmental sciences
180607 Terrestrial erosion
180603 Evaluation, allocation, and impacts of land use
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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