Patterns of soil nitrogen storage in China
Identifieur interne : 001107 ( Istex/Corpus ); précédent : 001106; suivant : 001108Patterns of soil nitrogen storage in China
Auteurs : Hanqin Tian ; Shaoqiang Wang ; Jiyuan Liu ; Shufen Pan ; Hua Chen ; Chi Zhang ; Xuezheng ShiSource :
- Global Biogeochemical Cycles [ 0886-6236 ] ; 2006-03.
Abstract
We have investigated the storage and spatial distribution of soil nitrogen (N) in China based on a data set of 2480 soil profiles and a map of Chinese soil types at a spatial resolution of 1:1,000,000. Our estimate indicates that the total N storage in China is 8.29 × 1015 g, representing 5.9–8.7% of the total global N storage. The total N storage in China is on average or slightly above the average of its share in the global N storage, even though low nitrogen content soils cover a large area in China. N density varies substantially with soil types and regions. Peat soils in the southeast of Tibet, southwest China, show the highest averaged N density with a value of 7314.9 g/m3 among all soil types. This is more than 30 times of the lowest N density of brown desert soils in the western desert and arid region. The highest N storages among all the soil types are the felty soil in southeast of Tibet, dark‐brown earths in northeast China, and red earths in southeast China with values of 921.1, 611.4, and 569.6 Tg, respectively. N density also varies with land cover types in China. Wetlands in southwest China exhibit the highest N density at 6775.9 g/m3 and deserts in northwest China have the least at 447.5 g/m3. Our analysis also indicates that land cover types are poor predictors of N content. Further research is needed to examine how transformation from organic agriculture to increased use of fertilizers and pesticides has influenced N storage in China.
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DOI: 10.1029/2005GB002464
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Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China</mods:affiliation></affiliation></author><author><name sortKey="Pan, Shufen" sort="Pan, Shufen" uniqKey="Pan S" first="Shufen" last="Pan">Shufen Pan</name><affiliation><mods:affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</mods:affiliation></affiliation></author><author><name sortKey="Chen, Hua" sort="Chen, Hua" uniqKey="Chen H" first="Hua" last="Chen">Hua Chen</name><affiliation><mods:affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</mods:affiliation></affiliation></author><author><name sortKey="Zhang, Chi" sort="Zhang, Chi" uniqKey="Zhang C" first="Chi" last="Zhang">Chi Zhang</name><affiliation><mods:affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</mods:affiliation></affiliation></author><author><name sortKey="Shi, Xuezheng" sort="Shi, Xuezheng" uniqKey="Shi X" first="Xuezheng" last="Shi">Xuezheng Shi</name><affiliation><mods:affiliation>State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:013140506240DDEE071365F726ED2C79678E6F51</idno><date when="2006" year="2006">2006</date><idno type="doi">10.1029/2005GB002464</idno><idno type="url">https://api.istex.fr/document/013140506240DDEE071365F726ED2C79678E6F51/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001107</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001107</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Patterns of soil nitrogen storage in China</title><author><name sortKey="Tian, Hanqin" sort="Tian, Hanqin" uniqKey="Tian H" first="Hanqin" last="Tian">Hanqin Tian</name><affiliation><mods:affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: tianhan@auburn.edu</mods:affiliation></affiliation></author><author><name sortKey="Wang, Shaoqiang" sort="Wang, Shaoqiang" uniqKey="Wang S" first="Shaoqiang" last="Wang">Shaoqiang Wang</name><affiliation><mods:affiliation>Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China</mods:affiliation></affiliation></author><author><name sortKey="Liu, Jiyuan" sort="Liu, Jiyuan" uniqKey="Liu J" first="Jiyuan" last="Liu">Jiyuan Liu</name><affiliation><mods:affiliation>Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China</mods:affiliation></affiliation></author><author><name sortKey="Pan, Shufen" sort="Pan, Shufen" uniqKey="Pan S" first="Shufen" last="Pan">Shufen Pan</name><affiliation><mods:affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</mods:affiliation></affiliation></author><author><name sortKey="Chen, Hua" sort="Chen, Hua" uniqKey="Chen H" first="Hua" last="Chen">Hua Chen</name><affiliation><mods:affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</mods:affiliation></affiliation></author><author><name sortKey="Zhang, Chi" sort="Zhang, Chi" uniqKey="Zhang C" first="Chi" last="Zhang">Chi Zhang</name><affiliation><mods:affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</mods:affiliation></affiliation></author><author><name sortKey="Shi, Xuezheng" sort="Shi, Xuezheng" uniqKey="Shi X" first="Xuezheng" last="Shi">Xuezheng Shi</name><affiliation><mods:affiliation>State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Global Biogeochemical Cycles</title><title level="j" type="abbrev">Global Biogeochem. Cycles</title><idno type="ISSN">0886-6236</idno><idno type="eISSN">1944-9224</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2006-03">2006-03</date><biblScope unit="volume">20</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0886-6236</idno></series><idno type="istex">013140506240DDEE071365F726ED2C79678E6F51</idno><idno type="DOI">10.1029/2005GB002464</idno><idno type="ArticleID">2005GB002464</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0886-6236</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">We have investigated the storage and spatial distribution of soil nitrogen (N) in China based on a data set of 2480 soil profiles and a map of Chinese soil types at a spatial resolution of 1:1,000,000. Our estimate indicates that the total N storage in China is 8.29 × 1015 g, representing 5.9–8.7% of the total global N storage. The total N storage in China is on average or slightly above the average of its share in the global N storage, even though low nitrogen content soils cover a large area in China. N density varies substantially with soil types and regions. Peat soils in the southeast of Tibet, southwest China, show the highest averaged N density with a value of 7314.9 g/m3 among all soil types. This is more than 30 times of the lowest N density of brown desert soils in the western desert and arid region. The highest N storages among all the soil types are the felty soil in southeast of Tibet, dark‐brown earths in northeast China, and red earths in southeast China with values of 921.1, 611.4, and 569.6 Tg, respectively. N density also varies with land cover types in China. Wetlands in southwest China exhibit the highest N density at 6775.9 g/m3 and deserts in northwest China have the least at 447.5 g/m3. Our analysis also indicates that land cover types are poor predictors of N content. Further research is needed to examine how transformation from organic agriculture to increased use of fertilizers and pesticides has influenced N storage in China.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Hanqin Tian</name><affiliations><json:string>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</json:string><json:string>E-mail: tianhan@auburn.edu</json:string></affiliations></json:item><json:item><name>Shaoqiang Wang</name><affiliations><json:string>Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China</json:string></affiliations></json:item><json:item><name>Jiyuan Liu</name><affiliations><json:string>Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China</json:string></affiliations></json:item><json:item><name>Shufen Pan</name><affiliations><json:string>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</json:string></affiliations></json:item><json:item><name>Hua Chen</name><affiliations><json:string>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</json:string></affiliations></json:item><json:item><name>Chi Zhang</name><affiliations><json:string>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</json:string></affiliations></json:item><json:item><name>Xuezheng Shi</name><affiliations><json:string>State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>China</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>nitrogen cycle</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>soil organic nitrogen</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>spatial distribution</value></json:item></subject><articleId><json:string>2005GB002464</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>We have investigated the storage and spatial distribution of soil nitrogen (N) in China based on a data set of 2480 soil profiles and a map of Chinese soil types at a spatial resolution of 1:1,000,000. Our estimate indicates that the total N storage in China is 8.29 × 1015 g, representing 5.9–8.7% of the total global N storage. The total N storage in China is on average or slightly above the average of its share in the global N storage, even though low nitrogen content soils cover a large area in China. N density varies substantially with soil types and regions. Peat soils in the southeast of Tibet, southwest China, show the highest averaged N density with a value of 7314.9 g/m3 among all soil types. This is more than 30 times of the lowest N density of brown desert soils in the western desert and arid region. The highest N storages among all the soil types are the felty soil in southeast of Tibet, dark‐brown earths in northeast China, and red earths in southeast China with values of 921.1, 611.4, and 569.6 Tg, respectively. N density also varies with land cover types in China. Wetlands in southwest China exhibit the highest N density at 6775.9 g/m3 and deserts in northwest China have the least at 447.5 g/m3. Our analysis also indicates that land cover types are poor predictors of N content. 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Our estimate indicates that the total N storage in China is 8.29 × 1015 g, representing 5.9–8.7% of the total global N storage. The total N storage in China is on average or slightly above the average of its share in the global N storage, even though low nitrogen content soils cover a large area in China. N density varies substantially with soil types and regions. Peat soils in the southeast of Tibet, southwest China, show the highest averaged N density with a value of 7314.9 g/m3 among all soil types. This is more than 30 times of the lowest N density of brown desert soils in the western desert and arid region. The highest N storages among all the soil types are the felty soil in southeast of Tibet, dark‐brown earths in northeast China, and red earths in southeast China with values of 921.1, 611.4, and 569.6 Tg, respectively. N density also varies with land cover types in China. Wetlands in southwest China exhibit the highest N density at 6775.9 g/m3 and deserts in northwest China have the least at 447.5 g/m3. Our analysis also indicates that land cover types are poor predictors of N content. Further research is needed to examine how transformation from organic agriculture to increased use of fertilizers and pesticides has influenced N storage in China.</p></abstract><textClass><keywords scheme="keyword"><list><head>keywords</head><item><term>China</term></item><item><term>nitrogen cycle</term></item><item><term>soil organic nitrogen</term></item><item><term>spatial distribution</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>index-terms</head><item><term>BIOGEOSCIENCES</term></item><item><term>Nitrogen cycling</term></item><item><term>Biogeochemical cycles, processes, and modeling</term></item><item><term>Nutrients and nutrient cycling</term></item><item><term>Soils/pedology</term></item><item><term>Biogeochemical kinetics and reaction modeling</term></item><item><term>CRYOSPHERE</term></item><item><term>Biogeochemistry</term></item><item><term>GLOBAL CHANGE</term></item><item><term>Biogeochemical cycles, processes, and modeling</term></item><item><term>HYDROLOGY</term></item><item><term>Soils</term></item><item><term>OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL</term></item><item><term>Biogeochemical cycles, processes, and modeling</term></item><item><term>Nutrients and nutrient cycling</term></item><item><term>Marine organic chemistry</term></item><item><term>PALEOCEANOGRAPHY</term></item><item><term>Biogeochemical cycles, processes, and modeling</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2005-01-20">Received</change><change when="2005-10-31">Registration</change><change when="2006-03">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/013140506240DDEE071365F726ED2C79678E6F51/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component type="serialArticle" version="2.0" xml:lang="en" xml:id="gbc1240"><header><publicationMeta level="product"><doi>10.1002/(ISSN)1944-9224</doi><issn type="print">0886-6236</issn><issn type="electronic">1944-9224</issn><idGroup><id type="product" value="GBC"></id><id type="coden" value="GBCYEP"></id></idGroup><titleGroup><title type="main" xml:lang="en" sort="GLOBAL BIOGEOCHEMICAL CYCLES">Global Biogeochemical Cycles</title><title type="short">Global Biogeochem. 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Cycles</journalTitle>, <vol>20</vol>, GB1001, doi:<accessionId ref="info:doi/10.1029/2005GB002464">10.1029/2005GB002464</accessionId>.</citation></selfCitationGroup><linkGroup><link type="toTypesetVersion" href="file:GBC.GBC1240.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="figureTotal" number="3"></count><count type="tableTotal" number="3"></count></countGroup><titleGroup><title type="main">Patterns of soil nitrogen storage in China</title><title type="short">SOIL ORGANIC NITROGEN IN CHINA</title><title type="shortAuthors">Tian <i>et al</i>.</title></titleGroup><creators><creator creatorRole="author" xml:id="gbc1240-cr-0001" affiliationRef="#gbc1240-aff-0001"><personName><givenNames>Hanqin</givenNames> <familyName>Tian</familyName></personName><contactDetails><email normalForm="tianhan@auburn.edu">tianhan@auburn.edu</email></contactDetails></creator><creator creatorRole="author" xml:id="gbc1240-cr-0002" affiliationRef="#gbc1240-aff-0002"><personName><givenNames>Shaoqiang</givenNames> <familyName>Wang</familyName></personName></creator><creator creatorRole="author" xml:id="gbc1240-cr-0003" affiliationRef="#gbc1240-aff-0002"><personName><givenNames>Jiyuan</givenNames> <familyName>Liu</familyName></personName></creator><creator creatorRole="author" xml:id="gbc1240-cr-0004" affiliationRef="#gbc1240-aff-0001"><personName><givenNames>Shufen</givenNames> <familyName>Pan</familyName></personName></creator><creator creatorRole="author" xml:id="gbc1240-cr-0005" affiliationRef="#gbc1240-aff-0001"><personName><givenNames>Hua</givenNames> <familyName>Chen</familyName></personName></creator><creator creatorRole="author" xml:id="gbc1240-cr-0006" affiliationRef="#gbc1240-aff-0001"><personName><givenNames>Chi</givenNames> <familyName>Zhang</familyName></personName></creator><creator creatorRole="author" xml:id="gbc1240-cr-0007" affiliationRef="#gbc1240-aff-0003"><personName><givenNames>Xuezheng</givenNames> <familyName>Shi</familyName></personName></creator></creators><affiliationGroup><affiliation countryCode="US" type="organization" xml:id="gbc1240-aff-0001"><orgDiv>School of Forestry and Wildlife Sciences</orgDiv><orgName>Auburn University</orgName><address><city>Auburn</city><countryPart>Alabama</countryPart><country>USA</country></address></affiliation><affiliation countryCode="CN" type="organization" xml:id="gbc1240-aff-0002"><orgDiv>Institute of Geographic Sciences and Natural Resources Research</orgDiv><orgName>Chinese Academy of Sciences</orgName><address><city>Beijing</city><country>China</country></address></affiliation><affiliation countryCode="CN" type="organization" xml:id="gbc1240-aff-0003"><orgDiv>State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science</orgDiv><orgName>Chinese Academy of Sciences</orgName><address><city>Nanjing</city><country>China</country></address></affiliation></affiliationGroup><keywordGroup type="author"><keyword xml:id="gbc1240-kwd-0001">China</keyword><keyword xml:id="gbc1240-kwd-0002">nitrogen cycle</keyword><keyword xml:id="gbc1240-kwd-0003">soil organic nitrogen</keyword><keyword xml:id="gbc1240-kwd-0004">spatial distribution</keyword></keywordGroup><supportingInformation><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:08866236:media:gbc1240:gbc1240-sup-0001-t01"></mediaResource><caption>Tab‐delimited Table 1.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:08866236:media:gbc1240:gbc1240-sup-0002-t02"></mediaResource><caption>Tab‐delimited Table 2.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:08866236:media:gbc1240:gbc1240-sup-0003-t03"></mediaResource><caption>Tab‐delimited Table 3.</caption></supportingInfoItem></supportingInformation><abstractGroup><abstract type="main"><p xml:id="gbc1240-para-0001" label="1">We have investigated the storage and spatial distribution of soil nitrogen (N) in China based on a data set of 2480 soil profiles and a map of Chinese soil types at a spatial resolution of 1:1,000,000. Our estimate indicates that the total N storage in China is 8.29 × 10<sup>15</sup> g, representing 5.9–8.7% of the total global N storage. The total N storage in China is on average or slightly above the average of its share in the global N storage, even though low nitrogen content soils cover a large area in China. N density varies substantially with soil types and regions. Peat soils in the southeast of Tibet, southwest China, show the highest averaged N density with a value of 7314.9 g/m<sup>3</sup> among all soil types. This is more than 30 times of the lowest N density of brown desert soils in the western desert and arid region. The highest N storages among all the soil types are the felty soil in southeast of Tibet, dark‐brown earths in northeast China, and red earths in southeast China with values of 921.1, 611.4, and 569.6 Tg, respectively. N density also varies with land cover types in China. Wetlands in southwest China exhibit the highest N density at 6775.9 g/m<sup>3</sup> and deserts in northwest China have the least at 447.5 g/m<sup>3</sup>. Our analysis also indicates that land cover types are poor predictors of N content. Further research is needed to examine how transformation from organic agriculture to increased use of fertilizers and pesticides has influenced N storage in China.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Patterns of soil nitrogen storage in China</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>SOIL ORGANIC NITROGEN IN CHINA</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Patterns of soil nitrogen storage in China</title></titleInfo><name type="personal"><namePart type="given">Hanqin</namePart><namePart type="family">Tian</namePart><affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</affiliation><affiliation>E-mail: tianhan@auburn.edu</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Shaoqiang</namePart><namePart type="family">Wang</namePart><affiliation>Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Jiyuan</namePart><namePart type="family">Liu</namePart><affiliation>Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Shufen</namePart><namePart type="family">Pan</namePart><affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Hua</namePart><namePart type="family">Chen</namePart><affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Chi</namePart><namePart type="family">Zhang</namePart><affiliation>School of Forestry and Wildlife Sciences, Auburn University, Alabama, Auburn, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Xuezheng</namePart><namePart type="family">Shi</namePart><affiliation>State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><dateIssued encoding="w3cdtf">2006-03</dateIssued><dateCaptured encoding="w3cdtf">2005-01-20</dateCaptured><dateValid encoding="w3cdtf">2005-10-31</dateValid><edition>Tian, H., S. Wang, J. Liu, S. Pan, H. Chen, C. Zhang, and X. Shi (2006), Patterns of soil nitrogen storage in China, Global Biogeochem. Cycles, 20, GB1001, doi:10.1029/2005GB002464.</edition><copyrightDate encoding="w3cdtf">2006</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">3</extent><extent unit="tables">3</extent></physicalDescription><abstract>We have investigated the storage and spatial distribution of soil nitrogen (N) in China based on a data set of 2480 soil profiles and a map of Chinese soil types at a spatial resolution of 1:1,000,000. Our estimate indicates that the total N storage in China is 8.29 × 1015 g, representing 5.9–8.7% of the total global N storage. The total N storage in China is on average or slightly above the average of its share in the global N storage, even though low nitrogen content soils cover a large area in China. N density varies substantially with soil types and regions. Peat soils in the southeast of Tibet, southwest China, show the highest averaged N density with a value of 7314.9 g/m3 among all soil types. This is more than 30 times of the lowest N density of brown desert soils in the western desert and arid region. The highest N storages among all the soil types are the felty soil in southeast of Tibet, dark‐brown earths in northeast China, and red earths in southeast China with values of 921.1, 611.4, and 569.6 Tg, respectively. N density also varies with land cover types in China. Wetlands in southwest China exhibit the highest N density at 6775.9 g/m3 and deserts in northwest China have the least at 447.5 g/m3. Our analysis also indicates that land cover types are poor predictors of N content. Further research is needed to examine how transformation from organic agriculture to increased use of fertilizers and pesticides has influenced N storage in China.</abstract><note type="additional physical form">Tab‐delimited Table 1.Tab‐delimited Table 2.Tab‐delimited Table 3.</note><subject><genre>keywords</genre><topic>China</topic><topic>nitrogen cycle</topic><topic>soil organic nitrogen</topic><topic>spatial distribution</topic></subject><relatedItem type="host"><titleInfo><title>Global Biogeochemical Cycles</title></titleInfo><titleInfo type="abbreviated"><title>Global Biogeochem. Cycles</title></titleInfo><genre type="journal">journal</genre><subject><genre>index-terms</genre><topic authorityURI="http://psi.agu.org/taxonomy5/0400">BIOGEOSCIENCES</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0469">Nitrogen cycling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0414">Biogeochemical cycles, processes, and modeling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0470">Nutrients and nutrient cycling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0486">Soils/pedology</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0412">Biogeochemical kinetics and reaction modeling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0700">CRYOSPHERE</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0793">Biogeochemistry</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1600">GLOBAL CHANGE</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1615">Biogeochemical cycles, processes, and modeling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1800">HYDROLOGY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1865">Soils</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4800">OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4805">Biogeochemical cycles, processes, and modeling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4845">Nutrients and nutrient cycling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4850">Marine organic chemistry</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4900">PALEOCEANOGRAPHY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4912">Biogeochemical cycles, processes, and modeling</topic></subject><identifier type="ISSN">0886-6236</identifier><identifier type="eISSN">1944-9224</identifier><identifier type="DOI">10.1002/(ISSN)1944-9224</identifier><identifier type="CODEN">GBCYEP</identifier><identifier type="PublisherID">GBC</identifier><part><date>2006</date><detail type="volume"><caption>vol.</caption><number>20</number></detail><detail type="issue"><caption>no.</caption><number>1</number></detail><extent unit="pages"><start>n/a</start><end>n/a</end><total>9</total></extent></part></relatedItem><identifier type="istex">013140506240DDEE071365F726ED2C79678E6F51</identifier><identifier type="DOI">10.1029/2005GB002464</identifier><identifier type="ArticleID">2005GB002464</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright 2006 by the American Geophysical Union.</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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