Estimating Annual Soil Carbon Loss in Agricultural Peatland Soils Using a Nitrogen Budget Approach
Identifieur interne : 000545 ( Ncbi/Merge ); précédent : 000544; suivant : 000546Estimating Annual Soil Carbon Loss in Agricultural Peatland Soils Using a Nitrogen Budget Approach
Auteurs : Emilie R. Kirk [États-Unis] ; Chris Van Kessel [États-Unis] ; William R. Horwath [États-Unis] ; Bruce A. Linquist [États-Unis]Source :
- PLoS ONE [ 1932-6203 ] ; 2015.
Abstract
Around the world, peatland degradation and soil subsidence is occurring where these soils have been converted to agriculture. Since initial drainage in the mid-1800s, continuous farming of such soils in the California Sacramento-San Joaquin Delta (the Delta) has led to subsidence of up to 8 meters in places, primarily due to soil organic matter (SOM) oxidation and physical compaction. Rice (
Url:
DOI: 10.1371/journal.pone.0121432
PubMed: 25822494
PubMed Central: 4379157
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Estimating Annual Soil Carbon Loss in Agricultural Peatland Soils Using a Nitrogen Budget Approach</title>
<author><name sortKey="Kirk, Emilie R" sort="Kirk, Emilie R" uniqKey="Kirk E" first="Emilie R." last="Kirk">Emilie R. Kirk</name>
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<author><name sortKey="Linquist, Bruce A" sort="Linquist, Bruce A" uniqKey="Linquist B" first="Bruce A." last="Linquist">Bruce A. Linquist</name>
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<front><div type="abstract" xml:lang="en"><p>Around the world, peatland degradation and soil subsidence is occurring where these soils have been converted to agriculture. Since initial drainage in the mid-1800s, continuous farming of such soils in the California Sacramento-San Joaquin Delta (the Delta) has led to subsidence of up to 8 meters in places, primarily due to soil organic matter (SOM) oxidation and physical compaction. Rice (<italic>Oryza sativa</italic>
) production has been proposed as an alternative cropping system to limit SOM oxidation. Preliminary research on these soils revealed high N uptake by rice in N fertilizer omission plots, which we hypothesized was the result of SOM oxidation releasing N. Testing this hypothesis, we developed a novel N budgeting approach to assess annual soil C and N loss based on plant N uptake and fallow season N mineralization. Through field experiments examining N dynamics during growing season and winter fallow periods, a complete annual N budget was developed. Soil C loss was calculated from SOM-N mineralization using the soil C:N ratio. Surface water and crop residue were negligible in the total N uptake budget (3 – 4 % combined). Shallow groundwater contributed 24 – 33 %, likely representing subsurface SOM-N mineralization. Assuming 6 and 25 kg N ha-1 from atmospheric deposition and biological N2 fixation, respectively, our results suggest 77 – 81 % of plant N uptake (129 – 149 kg N ha<sup>-1</sup>
) was supplied by SOM mineralization. Considering a range of N uptake efficiency from 50 – 70 %, estimated net C loss ranged from 1149 – 2473 kg C ha<sup>-1</sup>
. These findings suggest that rice systems, as currently managed, reduce the rate of C loss from organic delta soils relative to other agricultural practices.</p>
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<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">PLoS One</journal-id>
<journal-id journal-id-type="iso-abbrev">PLoS ONE</journal-id>
<journal-id journal-id-type="publisher-id">plos</journal-id>
<journal-id journal-id-type="pmc">plosone</journal-id>
<journal-title-group><journal-title>PLoS ONE</journal-title>
</journal-title-group>
<issn pub-type="epub">1932-6203</issn>
<publisher><publisher-name>Public Library of Science</publisher-name>
<publisher-loc>San Francisco, CA USA</publisher-loc>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">25822494</article-id>
<article-id pub-id-type="pmc">4379157</article-id>
<article-id pub-id-type="doi">10.1371/journal.pone.0121432</article-id>
<article-id pub-id-type="publisher-id">PONE-D-14-22156</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>Estimating Annual Soil Carbon Loss in Agricultural Peatland Soils Using a Nitrogen Budget Approach</article-title>
<alt-title alt-title-type="running-head">Nitrogen Budget for Estimating Soil Carbon Loss</alt-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Kirk</surname>
<given-names>Emilie R.</given-names>
</name>
<xref ref-type="aff" rid="aff001"><sup>1</sup>
</xref>
<xref rid="cor001" ref-type="corresp">*</xref>
</contrib>
<contrib contrib-type="author"><name><surname>van Kessel</surname>
<given-names>Chris</given-names>
</name>
<xref ref-type="aff" rid="aff001"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Horwath</surname>
<given-names>William R.</given-names>
</name>
<xref ref-type="aff" rid="aff002"><sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Linquist</surname>
<given-names>Bruce A.</given-names>
</name>
<xref ref-type="aff" rid="aff001"><sup>1</sup>
</xref>
</contrib>
</contrib-group>
<aff id="aff001"><label>1</label>
<addr-line>Department of Plant Sciences, University of California Davis, Davis, California, United States of America</addr-line>
</aff>
<aff id="aff002"><label>2</label>
<addr-line>Department of Land, Air, and Water Resources, University of California Davis, Davis, California, United States of America</addr-line>
</aff>
<contrib-group><contrib contrib-type="editor"><name><surname>Wang</surname>
<given-names>Xiujun</given-names>
</name>
<role>Academic Editor</role>
<xref ref-type="aff" rid="edit1"></xref>
</contrib>
</contrib-group>
<aff id="edit1"><addr-line>University of Maryland, UNITED STATES</addr-line>
</aff>
<author-notes><fn fn-type="conflict" id="coi001"><p><bold>Competing Interests: </bold>
The authors have declared that no competing interests exist.</p>
</fn>
<fn fn-type="con" id="contrib001"><p>Conceived and designed the experiments: EK CVK WRH BAL. Performed the experiments: EK BAL. Analyzed the data: EK. Contributed reagents/materials/analysis tools: CVK BAL. Wrote the paper: EK CVK WRH BAL.</p>
</fn>
<corresp id="cor001">* E-mail: <email>erkirk@ucdavis.edu</email>
</corresp>
</author-notes>
<pub-date pub-type="epub"><day>30</day>
<month>3</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="collection"><year>2015</year>
</pub-date>
<volume>10</volume>
<issue>3</issue>
<elocation-id>e0121432</elocation-id>
<history><date date-type="received"><day>11</day>
<month>6</month>
<year>2014</year>
</date>
<date date-type="accepted"><day>16</day>
<month>2</month>
<year>2015</year>
</date>
</history>
<permissions><copyright-year>2015</copyright-year>
<copyright-holder>Kirk et al</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/"><license-p>This is an open access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License</ext-link>
, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited</license-p>
</license>
</permissions>
<self-uri content-type="pdf" xlink:type="simple" xlink:href="pone.0121432.pdf"></self-uri>
<abstract><p>Around the world, peatland degradation and soil subsidence is occurring where these soils have been converted to agriculture. Since initial drainage in the mid-1800s, continuous farming of such soils in the California Sacramento-San Joaquin Delta (the Delta) has led to subsidence of up to 8 meters in places, primarily due to soil organic matter (SOM) oxidation and physical compaction. Rice (<italic>Oryza sativa</italic>
) production has been proposed as an alternative cropping system to limit SOM oxidation. Preliminary research on these soils revealed high N uptake by rice in N fertilizer omission plots, which we hypothesized was the result of SOM oxidation releasing N. Testing this hypothesis, we developed a novel N budgeting approach to assess annual soil C and N loss based on plant N uptake and fallow season N mineralization. Through field experiments examining N dynamics during growing season and winter fallow periods, a complete annual N budget was developed. Soil C loss was calculated from SOM-N mineralization using the soil C:N ratio. Surface water and crop residue were negligible in the total N uptake budget (3 – 4 % combined). Shallow groundwater contributed 24 – 33 %, likely representing subsurface SOM-N mineralization. Assuming 6 and 25 kg N ha-1 from atmospheric deposition and biological N2 fixation, respectively, our results suggest 77 – 81 % of plant N uptake (129 – 149 kg N ha<sup>-1</sup>
) was supplied by SOM mineralization. Considering a range of N uptake efficiency from 50 – 70 %, estimated net C loss ranged from 1149 – 2473 kg C ha<sup>-1</sup>
. These findings suggest that rice systems, as currently managed, reduce the rate of C loss from organic delta soils relative to other agricultural practices.</p>
</abstract>
<funding-group><funding-statement>This work was supported by the U.S. Department of Agriculture, National Institute of Food and Agriculture, Agriculture and Food Research Initiative. Award #2011-67003-30371, <ext-link ext-link-type="uri" xlink:href="http://www.nifa.usda.gov/">http://www.nifa.usda.gov/</ext-link>
to WRH and the University of California, Davis Department of Plant Sciences Graduate Student Research Assistantship, <ext-link ext-link-type="uri" xlink:href="http://www.plantsciences.ucdavis.edu/plantsciences/">http://www.plantsciences.ucdavis.edu/plantsciences/</ext-link>
to EK. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.</funding-statement>
</funding-group>
<counts><fig-count count="3"></fig-count>
<table-count count="6"></table-count>
<page-count count="18"></page-count>
</counts>
<custom-meta-group><custom-meta id="data-availability"><meta-name>Data Availability</meta-name>
<meta-value>All relevant data are within the paper and its Supporting Information files.</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
<notes><title>Data Availability</title>
<p>All relevant data are within the paper and its Supporting Information files.</p>
</notes>
</front>
</pmc>
<affiliations><list><country><li>États-Unis</li>
</country>
<region><li>Californie</li>
</region>
</list>
<tree><country name="États-Unis"><region name="Californie"><name sortKey="Kirk, Emilie R" sort="Kirk, Emilie R" uniqKey="Kirk E" first="Emilie R." last="Kirk">Emilie R. Kirk</name>
</region>
<name sortKey="Horwath, William R" sort="Horwath, William R" uniqKey="Horwath W" first="William R." last="Horwath">William R. Horwath</name>
<name sortKey="Linquist, Bruce A" sort="Linquist, Bruce A" uniqKey="Linquist B" first="Bruce A." last="Linquist">Bruce A. Linquist</name>
<name sortKey="Van Kessel, Chris" sort="Van Kessel, Chris" uniqKey="Van Kessel C" first="Chris" last="Van Kessel">Chris Van Kessel</name>
</country>
</tree>
</affiliations>
</record>
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