Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/30218
Title: Contrasting agricultural management effects on soil organic carbon dynamics between topsoil and subsoil
Contributor(s): Osanai, Yui  (author)orcid ; Knox, Oliver  (author)orcid ; Nachimuthu, Gunasekhar (author); Wilson, Brian  (author)orcid 
Publication Date: 2020-08-21
DOI: 10.1071/SR19379
Handle Link: https://hdl.handle.net/1959.11/30218
Abstract: Agricultural practices (e.g. tillage, crop rotation and fertiliser application) have a strong influence on the balance between carbon (C) input and output by altering physicochemical and microbial properties that control decomposition processes in the soil. Recent studies suggest that the mechanisms by which agricultural practice impacts soil organic carbon (SOC) dynamics in the topsoil may not be the same as those in the subsoil. Here, we assessed SOC stock, soil organic fractions and nitrogen availability to 1.0 m in soils under a cotton (Gossypium hirsutum L.)-based cropping system, and assessed the impact of agricultural management (three historical cropping systems with or without maize (Zea mays L.) rotation) on SOC storage. We found that the maize rotation and changes in the particulate organic fraction influenced SOC stock in the topsoil, although the overall change in SOC stock was small. The large increase in subsoil SOC stock (by 31%) was dominated by changes in the mineral-associated organic fraction, which were influenced by historical cropping systems and recent maize rotation directly and indirectly via changes in soil nitrogen availability. The strong direct effect of maize rotation on SOC stock, particularly in the subsoil, suggests that the direct transfer of C into the subsoil SOC pool may dominate C dynamics in this cropping system. Therefore, agricultural management that affects the movement of C within the soil profile (e.g. changes in soil physical properties) could have a significant consequence for subsoil C storage.
Publication Type: Journal Article
Source of Publication: Soil Research, 59(1), p. 24-33
Publisher: CSIRO Publishing
Place of Publication: Australia
ISSN: 1838-6768
1838-675X
Fields of Research (FoR) 2008: 050301 Carbon Sequestration Science
Fields of Research (FoR) 2020: 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
410101 Carbon sequestration science
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
Appears in Collections:Journal Article
School of Environmental and Rural Science

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