Impacts of fine root turnover on forest NPP and soil C sequestration potential.
Science
; 302(5649): 1385-7, 2003 Nov 21.
Article
em En
| MEDLINE
| ID: mdl-14631037
ABSTRACT
Estimates of forest net primary production (NPP) demand accurate estimates of root production and turnover. We assessed root turnover with the use of an isotope tracer in two forest free-air carbon dioxide enrichment experiments. Growth at elevated carbon dioxide did not accelerate root turnover in either the pine or the hardwood forest. Turnover of fine root carbon varied from 1.2 to 9 years, depending on root diameter and dominant tree species. These long turnover times suggest that root production and turnover in forests have been overestimated and that sequestration of anthropogenic atmospheric carbon in forest soils may be lower than currently estimated.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Solo
/
Árvores
/
Carbono
/
Raízes de Plantas
/
Liquidambar
/
Pinus taeda
País/Região como assunto:
America do norte
Idioma:
En
Ano de publicação:
2003
Tipo de documento:
Article