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Title: | Subsoil Microbial Diversity and Stability in Rotational Cotton Systems | Contributor(s): | Polain, Katherine (author); Knox, Oliver (author) ; Wilson, Brian (author) ; Pereg, Lily (author) | Publication Date: | 2020-07-25 | Open Access: | Yes | DOI: | 10.3390/soilsystems4030044 | Handle Link: | https://hdl.handle.net/1959.11/30645 | Abstract: | Microbial diversity has been well documented for the top 0-0.30 m of agricultural soils. However, spatio-temporal research into subsoil microbial diversity and the effects of agricultural management remains limited. Soil type may influence subsoil microbial diversity, particularly Vertosols. These soils lack distinct horizons and are known to facilitate the downward movement of organic matter, potentially supporting subsoil microbiota, removed from the crop root system (i.e., bulk soils). Our research used the MiSeq Illumina Platform to investigate microbial diversity down the profile of an agricultural Australian Vertosol to 1.0 m in bulk soils, as influenced by crop system (continuous cotton and cotton-maize) and sample time (pre- and in-crop samples collected over two seasons). Overall, both alpha- (Chao1, Gini-Simpson Diversity and Evenness indices) and beta-diversity (nMDS and Sørensen's Index of Similarity) metrics indicated that both bacterial (16S) diversity and fungal (ITS) diversity decreased with increasing soil depth. The addition of a maize rotation did not significantly influence alpha-diversity metrics until 0.70-1.0 m depth in the soil, where bacterial diversity was significantly higher in this system, with beta-diversity measures indicating this is likely due to root system differences influencing dissolved organic carbon. Sample time did not significantly affect bacterial or fungal diversity over the two seasons, regardless of the crop type and status (i.e., crop in ground and post crop). The relatively stable subsoil fungal and overall microbial diversity in bulk soils over two crop seasons suggests that these microbiota have developed a tolerance to prolonged agricultural management. | Publication Type: | Journal Article | Source of Publication: | Soil Systems, 4(3), p. 1-18 | Publisher: | MDPI AG | Place of Publication: | Switzerland | ISSN: | 2571-8789 | Fields of Research (FoR) 2008: | 050301 Carbon Sequestration Science | Fields of Research (FoR) 2020: | 410203 Ecosystem function 410101 Carbon sequestration science 410603 Soil biology |
Socio-Economic Objective (SEO) 2008: | 961402 Farmland, Arable Cropland and Permanent Cropland Soils | Socio-Economic Objective (SEO) 2020: | 180605 Soils | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Environmental and Rural Science School of Science and Technology |
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openpublished/SubsoilPolainKnoxWilsonPereg2020JournalArticle.pdf | Published version | 2.66 MB | Adobe PDF Download Adobe | View/Open |
openpublished/SubsoilPolainKnoxWilson2020JournalArticle.pdf | Published version | 2.66 MB | Unknown Download Adobe | View/Open |
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