Yield Response of Lolium perenne Swards to Free Air CO sub(2) Enrichment Increased over Six Years in a High N Input System on Fertile Soil

Following a step increase in atmospheric levels of carbon dioxide, availability of mineral nitrogen may be insufficient to meet a plant's increased need for N. With time, the ecosystem may adapt to the new conditions, resulting in the development of a new equilibrium in the fluxes of C and N. T...

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Bibliographic Details
Published in:Global change biology 2000-10, Vol.6 (7), p.805-805
Main Authors: Daepp, Markus, Suter, Daniel, Almeida, Jose P, Isopp, Hubert, Hartwig, Ueli A, Frehner, Marco, Blum, Herbert
Format: Article
Language:English
Subjects:
Lolium perenne
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Summary:Following a step increase in atmospheric levels of carbon dioxide, availability of mineral nitrogen may be insufficient to meet a plant's increased need for N. With time, the ecosystem may adapt to the new conditions, resulting in the development of a new equilibrium in the fluxes of C and N. This process would cause a higher dry mass yield response in the plants to elevated CO sub(2). Findings are presented from tests investigating the impacts of elevated atmospheric partial pressure of CO sub(2) on Lolium perenne L. swards receiving two N fertilization regimes as part of a six-year FACE (Free Air Carbon dioxide Enrichment) test. Both CO sub(2) treatments resulted in an apparent net input of N into the ecosystem. Other impacts of the tested treatments are detailed.
ISSN:1354-1013
DOI:10.1046/j.1365-2486.2000.00359.x