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Total and fresh organic carbon distribution in aggregate size classes and single aggregate regions using natural 13C/12C tracer

Emilia Urbanek Orcid Logo, Alvin J.M. Smucker, Rainer Horn

Geoderma, Volume: 164, Issue: 3-4, Pages: 164 - 171

Swansea University Author: Emilia Urbanek Orcid Logo

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DOI (Published version): 10.1016/j.geoderma.2011.05.020

Abstract

Soil structure is known to stabilise organic carbon (Corg), and act as physical barrier between thedecomposing microorganisms and the substrates. It is, however, not fully understood how Corg and especially fresh material from plants is distributed within the soil structure. The aim of the study is...

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Published in: Geoderma
ISSN: 00167061
Published: 2011
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URI: https://cronfa.swan.ac.uk/Record/cronfa13506
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2017-12-15T14:22:59.4562660</datestamp><bib-version>v2</bib-version><id>13506</id><entry>2012-12-05</entry><title>Total and fresh organic carbon distribution in aggregate size classes and single aggregate regions using natural 13C/12C tracer</title><swanseaauthors><author><sid>6d7e46bd913e12897d7f222ca78a718f</sid><ORCID>0000-0002-7748-4416</ORCID><firstname>Emilia</firstname><surname>Urbanek</surname><name>Emilia Urbanek</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2012-12-05</date><deptcode>SGE</deptcode><abstract>Soil structure is known to stabilise organic carbon (Corg), and act as physical barrier between thedecomposing microorganisms and the substrates. It is, however, not fully understood how Corg and especially fresh material from plants is distributed within the soil structure. The aim of the study is to investigate the long- and short-term accumulation of Corg in soil macro-aggregates according to main soil structure formation models: hierarchical and gradient development around plant debris. Two typesof differently vegetated and tilled silty loam soil were selected for the examination of Corg and &#x3B4;13C signals within 4 aggregate size classes (&lt;2, 2&#x2013;5, 5&#x2013;8, and 8&#x2013;12 mm across) and 3 different concentric regions(exterior, transitional and interior) of single macro-aggregates. The total and fresh Corg distribution was identified in soil i) 24 years following the crop conversion from C3 to C4 and ii) 6 weeks greenhouse plant growth after conversion from C3 to C4 and vice-versa.The results showthat maize soil 24 years after C3 to C4 plant conversion has (9&#x2013;27%) higher Corg content and theleast negative &#x3B4;13C signal in the aggregate size class b2 mmin the topsoil, and 30&#x2013;40% higher Corg content in thesubsoil and is the only size fraction enriched in the fresh Corg while larger aggregates contain old carboncharacteristic for the C3 vegetation. Although without statistical significance, a consistent pattern of higher Corgcontent and less negative &#x3B4;13C values in the aggregate exteriors vs. the interior are found in the original soil.The aggregates from the greenhouse experiment 6 weeks after crop conversion are enriched by 6&#x2013;15% in thefresh organic carbon from the recently grown plant. The fresh Corg, however, is rather randomly distributedwithin the aggregates showing no particular enhancement in any of the aggregate regions</abstract><type>Journal Article</type><journal>Geoderma</journal><volume>164</volume><journalNumber>3-4</journalNumber><paginationStart>164</paginationStart><paginationEnd>171</paginationEnd><publisher/><issnPrint>00167061</issnPrint><keywords>soil carbon, soil aggregates</keywords><publishedDay>16</publishedDay><publishedMonth>6</publishedMonth><publishedYear>2011</publishedYear><publishedDate>2011-06-16</publishedDate><doi>10.1016/j.geoderma.2011.05.020</doi><url>http://www.sciencedirect.com/science/article/pii/S0016706111001583</url><notes/><college>COLLEGE NANME</college><department>Geography</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>SGE</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2017-12-15T14:22:59.4562660</lastEdited><Created>2012-12-05T10:12:46.1661752</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Biosciences, Geography and Physics - Geography</level></path><authors><author><firstname>Emilia</firstname><surname>Urbanek</surname><orcid>0000-0002-7748-4416</orcid><order>1</order></author><author><firstname>Alvin J.M.</firstname><surname>Smucker</surname><order>2</order></author><author><firstname>Rainer</firstname><surname>Horn</surname><order>3</order></author></authors><documents/><OutputDurs/></rfc1807>
spelling 2017-12-15T14:22:59.4562660 v2 13506 2012-12-05 Total and fresh organic carbon distribution in aggregate size classes and single aggregate regions using natural 13C/12C tracer 6d7e46bd913e12897d7f222ca78a718f 0000-0002-7748-4416 Emilia Urbanek Emilia Urbanek true false 2012-12-05 SGE Soil structure is known to stabilise organic carbon (Corg), and act as physical barrier between thedecomposing microorganisms and the substrates. It is, however, not fully understood how Corg and especially fresh material from plants is distributed within the soil structure. The aim of the study is to investigate the long- and short-term accumulation of Corg in soil macro-aggregates according to main soil structure formation models: hierarchical and gradient development around plant debris. Two typesof differently vegetated and tilled silty loam soil were selected for the examination of Corg and δ13C signals within 4 aggregate size classes (<2, 2–5, 5–8, and 8–12 mm across) and 3 different concentric regions(exterior, transitional and interior) of single macro-aggregates. The total and fresh Corg distribution was identified in soil i) 24 years following the crop conversion from C3 to C4 and ii) 6 weeks greenhouse plant growth after conversion from C3 to C4 and vice-versa.The results showthat maize soil 24 years after C3 to C4 plant conversion has (9–27%) higher Corg content and theleast negative δ13C signal in the aggregate size class b2 mmin the topsoil, and 30–40% higher Corg content in thesubsoil and is the only size fraction enriched in the fresh Corg while larger aggregates contain old carboncharacteristic for the C3 vegetation. Although without statistical significance, a consistent pattern of higher Corgcontent and less negative δ13C values in the aggregate exteriors vs. the interior are found in the original soil.The aggregates from the greenhouse experiment 6 weeks after crop conversion are enriched by 6–15% in thefresh organic carbon from the recently grown plant. The fresh Corg, however, is rather randomly distributedwithin the aggregates showing no particular enhancement in any of the aggregate regions Journal Article Geoderma 164 3-4 164 171 00167061 soil carbon, soil aggregates 16 6 2011 2011-06-16 10.1016/j.geoderma.2011.05.020 http://www.sciencedirect.com/science/article/pii/S0016706111001583 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University 2017-12-15T14:22:59.4562660 2012-12-05T10:12:46.1661752 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Emilia Urbanek 0000-0002-7748-4416 1 Alvin J.M. Smucker 2 Rainer Horn 3
title Total and fresh organic carbon distribution in aggregate size classes and single aggregate regions using natural 13C/12C tracer
spellingShingle Total and fresh organic carbon distribution in aggregate size classes and single aggregate regions using natural 13C/12C tracer
Emilia Urbanek
title_short Total and fresh organic carbon distribution in aggregate size classes and single aggregate regions using natural 13C/12C tracer
title_full Total and fresh organic carbon distribution in aggregate size classes and single aggregate regions using natural 13C/12C tracer
title_fullStr Total and fresh organic carbon distribution in aggregate size classes and single aggregate regions using natural 13C/12C tracer
title_full_unstemmed Total and fresh organic carbon distribution in aggregate size classes and single aggregate regions using natural 13C/12C tracer
title_sort Total and fresh organic carbon distribution in aggregate size classes and single aggregate regions using natural 13C/12C tracer
author_id_str_mv 6d7e46bd913e12897d7f222ca78a718f
author_id_fullname_str_mv 6d7e46bd913e12897d7f222ca78a718f_***_Emilia Urbanek
author Emilia Urbanek
author2 Emilia Urbanek
Alvin J.M. Smucker
Rainer Horn
format Journal article
container_title Geoderma
container_volume 164
container_issue 3-4
container_start_page 164
publishDate 2011
institution Swansea University
issn 00167061
doi_str_mv 10.1016/j.geoderma.2011.05.020
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
url http://www.sciencedirect.com/science/article/pii/S0016706111001583
document_store_str 0
active_str 0
description Soil structure is known to stabilise organic carbon (Corg), and act as physical barrier between thedecomposing microorganisms and the substrates. It is, however, not fully understood how Corg and especially fresh material from plants is distributed within the soil structure. The aim of the study is to investigate the long- and short-term accumulation of Corg in soil macro-aggregates according to main soil structure formation models: hierarchical and gradient development around plant debris. Two typesof differently vegetated and tilled silty loam soil were selected for the examination of Corg and δ13C signals within 4 aggregate size classes (<2, 2–5, 5–8, and 8–12 mm across) and 3 different concentric regions(exterior, transitional and interior) of single macro-aggregates. The total and fresh Corg distribution was identified in soil i) 24 years following the crop conversion from C3 to C4 and ii) 6 weeks greenhouse plant growth after conversion from C3 to C4 and vice-versa.The results showthat maize soil 24 years after C3 to C4 plant conversion has (9–27%) higher Corg content and theleast negative δ13C signal in the aggregate size class b2 mmin the topsoil, and 30–40% higher Corg content in thesubsoil and is the only size fraction enriched in the fresh Corg while larger aggregates contain old carboncharacteristic for the C3 vegetation. Although without statistical significance, a consistent pattern of higher Corgcontent and less negative δ13C values in the aggregate exteriors vs. the interior are found in the original soil.The aggregates from the greenhouse experiment 6 weeks after crop conversion are enriched by 6–15% in thefresh organic carbon from the recently grown plant. The fresh Corg, however, is rather randomly distributedwithin the aggregates showing no particular enhancement in any of the aggregate regions
published_date 2011-06-16T03:15:27Z
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score 11.013731

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