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Science ; 315(5810): 361-4, 2007 Jan 19.
Artigo em Inglês | MEDLINE | ID: mdl-17234944

RESUMO

Litter decomposition provides the primary source of mineral nitrogen (N) for biological activity in most terrestrial ecosystems. A 10-year decomposition experiment in 21 sites from seven biomes found that net N release from leaf litter is dominantly driven by the initial tissue N concentration and mass remaining regardless of climate, edaphic conditions, or biota. Arid grasslands exposed to high ultraviolet radiation were an exception, where net N release was insensitive to initial N. Roots released N linearly with decomposition and exhibited little net N immobilization. We suggest that fundamental constraints on decomposer physiologies lead to predictable global-scale patterns in net N release during decomposition.


Assuntos
Biodegradação Ambiental , Ecossistema , Nitrogênio/metabolismo , Plantas/metabolismo , Carbono/metabolismo , Clima , Umidade , Matemática , Folhas de Planta/metabolismo , Raízes de Plantas/metabolismo , Poaceae , Análise de Regressão , Estações do Ano , Microbiologia do Solo , Temperatura , Fatores de Tempo , Árvores
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