State and change in carbon pools in the forests of tropical Africa
Identifieur interne : 001456 ( Main/Exploration ); précédent : 001455; suivant : 001457State and change in carbon pools in the forests of tropical Africa
Auteurs : Greg Gaston ; Sandra Brown ; Massimiliano Lorenzini [Italie] ; K. D. Singh [Italie]Source :
- 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
Affiliations:
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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.</div></front></TEI><affiliations><list><country><li>Italie</li></country><region><li>Latium</li></region><settlement><li>Rome</li></settlement></list><tree><noCountry><name sortKey="Brown, Sandra" sort="Brown, Sandra" uniqKey="Brown S" first="Sandra" last="Brown">Sandra Brown</name><name sortKey="Gaston, Greg" sort="Gaston, Greg" uniqKey="Gaston G" first="Greg" last="Gaston">Greg Gaston</name></noCountry><country name="Italie"><region name="Latium"><name sortKey="Lorenzini, Massimiliano" sort="Lorenzini, Massimiliano" uniqKey="Lorenzini M" first="Massimiliano" last="Lorenzini">Massimiliano Lorenzini</name></region><name sortKey="Singh, K D" sort="Singh, K D" uniqKey="Singh K" first="K. D." last="Singh">K. D. Singh</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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