Ecosystem feedbacks and nitrogen fixation in boreal forests.
Science
; 320(5880): 1181, 2008 May 30.
Article
em En
| MEDLINE
| ID: mdl-18511682
ABSTRACT
Biological feedback mechanisms regulate fundamental ecosystem processes and potentially regulate ecosystem productivity. To date, no studies have documented the down-regulation of terrestrial nitrogen (N) fixation via an ecosystem-level feedback mechanism. Herein, we demonstrate such a feedback in boreal forests. Rapid cycling of N in early secondary succession forests yielded greater throughfall N deposition, which in turn decreased N fixation by cyanobacterial associates in feather moss carpets that reside on the forest floor. The forest canopy exerts a tight control on biotic N input at a period of high productivity.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Árvores
/
Ecossistema
/
Fixação de Nitrogênio
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article