Greater soil carbon stocks and faster turnover rates with increasing agricultural productivity
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Sanderman, Jon; Creamer, Courtney; Baisden, W. Troy; Farrell, Mark; Fallon, Stewart
Description
Devising agricultural management schemes that enhance food security and soil carbon levels is a high priority for many nations. However, the coupling between agricultural productivity, soil carbon stocks and organic matter turnover rates is still unclear. Archived soil samples from four decades of a long-term crop rotation trial were analyzed for soil organic matter (SOM) cycling-relevant properties: C and N content, bulk composition by nuclear magnetic resonance (NMR) spectroscopy, amino sugar...[Show more]
dc.contributor.author | Sanderman, Jon | |
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dc.contributor.author | Creamer, Courtney | |
dc.contributor.author | Baisden, W. Troy | |
dc.contributor.author | Farrell, Mark | |
dc.contributor.author | Fallon, Stewart | |
dc.date.accessioned | 2019-04-30T01:20:14Z | |
dc.date.available | 2019-04-30T01:20:14Z | |
dc.identifier.issn | 2199-3971 | |
dc.identifier.uri | http://hdl.handle.net/1885/160762 | |
dc.description.abstract | Devising agricultural management schemes that enhance food security and soil carbon levels is a high priority for many nations. However, the coupling between agricultural productivity, soil carbon stocks and organic matter turnover rates is still unclear. Archived soil samples from four decades of a long-term crop rotation trial were analyzed for soil organic matter (SOM) cycling-relevant properties: C and N content, bulk composition by nuclear magnetic resonance (NMR) spectroscopy, amino sugar content, short-term C bioavailability assays, and long-term C turnover rates by modeling the incorporation of the bomb spike in atmospheric 14C into the soil. After > 40 years under consistent management, topsoil carbon stocks ranged from 14 to 33MgCha-1 and were linearly related to the mean productivity of each treatment. Measurements of SOM composition demonstrated increasing amounts of plant- and microbially derived SOM along the productivity gradient. Under two modeling scenarios, radiocarbon data indicated overall SOM turnover time decreased from 40 to 13 years with increasing productivity - twice the rate of decline predicted from simple steady-state models or static three-pool decay rates of measured C pool distributions. Similarly, the half-life of synthetic root exudates decreased from 30.4 to 21.5 h with increasing productivity, indicating accelerated microbial activity. These findings suggest that there is a direct feedback between accelerated biological activity, carbon cycling rates and rates of carbon stabilization with important implications for how SOM dynamics are represented in models. | |
dc.description.sponsorship | We would like to thank our predecessors at the Waite Research Institute for having the foresight to archive soil samples from this long-term trial, T. Carter for laboratory assistance, and J. McGowan for assistance in running NMR analyses. Funds for this research were provided by the CSIRO Sustainable Agriculture National Research Flagship and New Zealand public research funding through GNS Science (540GCT82). Mark Farrell was supported by a CSIRO Julius Career Award. | |
dc.format.extent | 16 pages | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | European Geosciences Union (EGU) and Copernicus GmbH | |
dc.rights | © Author(s) 2017. CC Attribution 3.0 License. | |
dc.source | SOIL | |
dc.subject | soil | |
dc.subject | carbon | |
dc.subject | soil organic matter (SOM) | |
dc.subject | modeling | |
dc.title | Greater soil carbon stocks and faster turnover rates with increasing agricultural productivity | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 3 | |
dcterms.dateAccepted | 2016-12-12 | |
dc.date.issued | 2017-01-04 | |
local.identifier.absfor | 050302 - Land Capability and Soil Degradation | |
local.identifier.ariespublication | u4485658xPUB288 | |
local.publisher.url | https://www.egu.eu/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Sanderman, Jon, CSIRO Land and Water | |
local.contributor.affiliation | Creamer, Courtney, CSIRO | |
local.contributor.affiliation | Baisden, W. Troy, GNS Science | |
local.contributor.affiliation | Farrell, Mark, CSIRO | |
local.contributor.affiliation | Fallon, Stewart, College of Science, The Australian National University | |
local.identifier.essn | 2199-398X | |
local.bibliographicCitation.issue | 1 | |
local.bibliographicCitation.startpage | 1 | |
local.bibliographicCitation.lastpage | 16 | |
local.identifier.doi | 10.5194/soil-3-1-2017 | |
local.identifier.absseo | 961402 - Farmland, Arable Cropland and Permanent Cropland Soils | |
dc.date.updated | 2019-03-12T07:35:29Z | |
local.identifier.scopusID | 2-s2.0-85030566896 | |
dcterms.accessRights | Open Access | |
Collections | ANU Research Publications |
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