State and change in carbon pools in the forests of tropical Africa
Identifieur interne : 000F34 ( Istex/Corpus ); précédent : 000F33; suivant : 000F35State and change in carbon pools in the forests of tropical Africa
Auteurs : Greg Gaston ; Sandra Brown ; Massimiliano Lorenzini ; K. D. SinghSource :
- Global Change Biology [ 1354-1013 ] ; 1998-01.
Abstract
To improve estimates of the state and change in C pools due to changes in land use in tropical forests of Africa, we combined spatially explicit estimates of biomass C density, obtained by modelling in a geographical information system (GIS), with new data on the area of forests (woody formations with a minimum of 10% crown cover) reported at subnational units for 1980 and 1990 by the Food and Agriculture Organization (FAO). Estimates of the biomass C densities for grass/shrub savannas were also included using a simple model based on precipitation. The total C pool in above– and below–ground forests and grass/shrub savannas of Africa for 1980 was 50.8 Pg (1015g), with aboveground forest biomass accounting for 75% of the total, below–ground forest biomass for 21%, and grass/shrub savannas for 4%. Area weighted mean biomass C densities were about 180 Mg ha–1 for lowland moist forests, 82 Mg ha–1 for all forests, and 6 Mg ha–1 for grass savannas. The total change in the aboveground forest C pool for the decade 1980–90 due to changes in land cover and use was estimated to be a decrease of 6.6 Pg C. Of this total, 43% was due to deforestation and 57% due to biomass reduction by other human activities. Six countries, mostly in central Africa, accounted for more than 73% of the total change in the C pool. The difference between state and change of C pool estimates made at the subnational scale and those made at the national scale proved to be insignificant across the region as a whole (2% for pools and – 1% for change in pool) but potentially important to individual countries (from + 36% to – 39% for pools and from + 43% to – 57% for change in pool). The differences between the two approaches may reflect a better match of the areas being deforested with the biomass C density of forests being cleared.
Url:
DOI: 10.1046/j.1365-2486.1998.00114.x
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ISTEX:FD3DEE62F1A731CD1FAF1959483CC2AC41AB7827Le document en format XML
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Estimates of the biomass C densities for grass/shrub savannas were also included using a simple model based on precipitation. The total C pool in above– and below–ground forests and grass/shrub savannas of Africa for 1980 was 50.8 Pg (1015g), with aboveground forest biomass accounting for 75% of the total, below–ground forest biomass for 21%, and grass/shrub savannas for 4%. Area weighted mean biomass C densities were about 180 Mg ha–1 for lowland moist forests, 82 Mg ha–1 for all forests, and 6 Mg ha–1 for grass savannas. The total change in the aboveground forest C pool for the decade 1980–90 due to changes in land cover and use was estimated to be a decrease of 6.6 Pg C. Of this total, 43% was due to deforestation and 57% due to biomass reduction by other human activities. Six countries, mostly in central Africa, accounted for more than 73% of the total change in the C pool. The difference between state and change of C pool estimates made at the subnational scale and those made at the national scale proved to be insignificant across the region as a whole (2% for pools and – 1% for change in pool) but potentially important to individual countries (from + 36% to – 39% for pools and from + 43% to – 57% for change in pool). 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Estimates of the biomass C densities for grass/shrub savannas were also included using a simple model based on precipitation. The total C pool in above– and below–ground forests and grass/shrub savannas of Africa for 1980 was 50.8 Pg (1015g), with aboveground forest biomass accounting for 75% of the total, below–ground forest biomass for 21%, and grass/shrub savannas for 4%. Area weighted mean biomass C densities were about 180 Mg ha–1 for lowland moist forests, 82 Mg ha–1 for all forests, and 6 Mg ha–1 for grass savannas. The total change in the aboveground forest C pool for the decade 1980–90 due to changes in land cover and use was estimated to be a decrease of 6.6 Pg C. Of this total, 43% was due to deforestation and 57% due to biomass reduction by other human activities. Six countries, mostly in central Africa, accounted for more than 73% of the total change in the C pool. The difference between state and change of C pool estimates made at the subnational scale and those made at the national scale proved to be insignificant across the region as a whole (2% for pools and – 1% for change in pool) but potentially important to individual countries (from + 36% to – 39% for pools and from + 43% to – 57% for change in pool). The differences between the two approaches may reflect a better match of the areas being deforested with the biomass C density of forests being cleared.</p></abstract></profileDesc><revisionDesc><change when="1998-01">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-12-13">References added</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2017-02-9">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/FD3DEE62F1A731CD1FAF1959483CC2AC41AB7827/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley component found"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Science Ltd</publisherName><publisherLoc>Oxford BSL</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1365-2486</doi><issn type="print">1354-1013</issn><issn type="electronic">1365-2486</issn><idGroup><id type="product" value="GCB"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="GLOBAL CHANGE BIOLOGY">Global Change Biology</title></titleGroup></publicationMeta><publicationMeta level="part" position="01001"><doi origin="wiley">10.1111/gcb.1998.4.issue-1</doi><numberingGroup><numbering type="journalVolume" number="4">4</numbering><numbering type="journalIssue" number="1">1</numbering></numberingGroup><coverDate startDate="1998-01">January 1998</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="0009700" status="forIssue"><doi origin="wiley">10.1046/j.1365-2486.1998.00114.x</doi><idGroup><id type="unit" value="GCB114"></id></idGroup><countGroup><count type="pageTotal" number="18"></count></countGroup><titleGroup><title type="tocHeading1">Original Article</title></titleGroup><copyright>Blackwell Science Ltd</copyright><eventGroup><event type="firstOnline" date="2002-01-04"></event><event type="publishedOnlineFinalForm" date="2002-01-04"></event><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:2.3.2 mode:FullText source:Header result:Header" date="2010-03-06"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-01-25"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-10-23"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="97">97</numbering><numbering type="pageLast" number="114">114</numbering></numberingGroup><correspondenceTo> SANDRA BROWN tel +1/ 541 754 4346, fax +1/ 541 754 4799<email>british@heart.cor.epa.gov</email></correspondenceTo><linkGroup><link type="toTypesetVersion" href="file:GCB.GCB114.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="figureTotal" number="0"></count><count type="tableTotal" number="0"></count><count type="referenceTotal" number="0"></count><count type="linksPubMed" number="0"></count><count type="linksCrossRef" number="0"></count></countGroup><titleGroup><title type="main">State and change in carbon pools in the forests of tropical Africa</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1"><personName><givenNames>GREG </givenNames><familyName>GASTON</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a1"><personName><givenNames> SANDRA </givenNames><familyName>BROWN</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a2"><personName><givenNames> MASSIMILIANO </givenNames><familyName>LORENZINI</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a2"><personName><givenNames>K. D. </givenNames><familyName>SINGH</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1"><unparsedAffiliation>US Environmental Protection Agency, National Health and Environmental Effects Research Laboratory, Western Ecology Division, 200 SW 35th St, Corvallis, OR 97333, USA,</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="IT"><unparsedAffiliation>Food and Agriculture Organization of the United Nations, Forestry Department, Viale delle Terme di Caracalla, 00100 Rome, Italy</unparsedAffiliation></affiliation></affiliationGroup><abstractGroup><abstract type="main" xml:lang="en"><p>To improve estimates of the state and change in C pools due to changes in land use in tropical forests of Africa, we combined spatially explicit estimates of biomass C density, obtained by modelling in a geographical information system (GIS), with new data on the area of forests (woody formations with a minimum of 10% crown cover) reported at subnational units for 1980 and 1990 by the Food and Agriculture Organization (FAO). Estimates of the biomass C densities for grass/shrub savannas were also included using a simple model based on precipitation. The total C pool in above– and below–ground forests and grass/shrub savannas of Africa for 1980 was 50.8 Pg (10<sup>15</sup>g), with aboveground forest biomass accounting for 75% of the total, below–ground forest biomass for 21%, and grass/shrub savannas for 4%. Area weighted mean biomass C densities were about 180 Mg ha<sup>–1</sup> for lowland moist forests, 82 Mg ha<sup>–1</sup> for all forests, and 6 Mg ha<sup>–1</sup> for grass savannas. The total change in the aboveground forest C pool for the decade 1980–90 due to changes in land cover and use was estimated to be a decrease of 6.6 Pg C. Of this total, 43% was due to deforestation and 57% due to biomass reduction by other human activities. Six countries, mostly in central Africa, accounted for more than 73% of the total change in the C pool. The difference between state and change of C pool estimates made at the subnational scale and those made at the national scale proved to be insignificant across the region as a whole (2% for pools and – 1% for change in pool) but potentially important to individual countries (from + 36% to – 39% for pools and from + 43% to – 57% for change in pool). The differences between the two approaches may reflect a better match of the areas being deforested with the biomass C density of forests being cleared.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>State and change in carbon pools in the forests of tropical Africa</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>State and change in carbon pools in the forests of tropical Africa</title></titleInfo><name type="personal"><namePart type="given">GREG</namePart><namePart type="family">GASTON</namePart><affiliation>US Environmental Protection Agency, National Health and Environmental Effects Research Laboratory, Western Ecology Division, 200 SW 35th St, Corvallis, OR 97333, USA,</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">SANDRA</namePart><namePart type="family">BROWN</namePart><affiliation>US Environmental Protection Agency, National Health and Environmental Effects Research Laboratory, Western Ecology Division, 200 SW 35th St, Corvallis, OR 97333, USA,</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">MASSIMILIANO</namePart><namePart type="family">LORENZINI</namePart><affiliation>Food and Agriculture Organization of the United Nations, Forestry Department, Viale delle Terme di Caracalla, 00100 Rome, Italy</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">K. D.</namePart><namePart type="family">SINGH</namePart><affiliation>Food and Agriculture Organization of the United Nations, Forestry Department, Viale delle Terme di Caracalla, 00100 Rome, Italy</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Science Ltd</publisher><place><placeTerm type="text">Oxford BSL</placeTerm></place><dateIssued encoding="w3cdtf">1998-01</dateIssued><copyrightDate encoding="w3cdtf">1998</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">To improve estimates of the state and change in C pools due to changes in land use in tropical forests of Africa, we combined spatially explicit estimates of biomass C density, obtained by modelling in a geographical information system (GIS), with new data on the area of forests (woody formations with a minimum of 10% crown cover) reported at subnational units for 1980 and 1990 by the Food and Agriculture Organization (FAO). Estimates of the biomass C densities for grass/shrub savannas were also included using a simple model based on precipitation. The total C pool in above– and below–ground forests and grass/shrub savannas of Africa for 1980 was 50.8 Pg (1015g), with aboveground forest biomass accounting for 75% of the total, below–ground forest biomass for 21%, and grass/shrub savannas for 4%. Area weighted mean biomass C densities were about 180 Mg ha–1 for lowland moist forests, 82 Mg ha–1 for all forests, and 6 Mg ha–1 for grass savannas. The total change in the aboveground forest C pool for the decade 1980–90 due to changes in land cover and use was estimated to be a decrease of 6.6 Pg C. Of this total, 43% was due to deforestation and 57% due to biomass reduction by other human activities. Six countries, mostly in central Africa, accounted for more than 73% of the total change in the C pool. The difference between state and change of C pool estimates made at the subnational scale and those made at the national scale proved to be insignificant across the region as a whole (2% for pools and – 1% for change in pool) but potentially important to individual countries (from + 36% to – 39% for pools and from + 43% to – 57% for change in pool). The differences between the two approaches may reflect a better match of the areas being deforested with the biomass C density of forests being cleared.</abstract><relatedItem type="host"><titleInfo><title>Global Change Biology</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">1354-1013</identifier><identifier type="eISSN">1365-2486</identifier><identifier type="DOI">10.1111/(ISSN)1365-2486</identifier><identifier type="PublisherID">GCB</identifier><part><date>1998</date><detail type="volume"><caption>vol.</caption><number>4</number></detail><detail type="issue"><caption>no.</caption><number>1</number></detail><extent unit="pages"><start>97</start><end>114</end><total>18</total></extent></part></relatedItem><identifier type="istex">FD3DEE62F1A731CD1FAF1959483CC2AC41AB7827</identifier><identifier type="DOI">10.1046/j.1365-2486.1998.00114.x</identifier><identifier type="ArticleID">GCB114</identifier><accessCondition type="use and reproduction" contentType="copyright">Blackwell Science Ltd</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Science Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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