Effects of Elevated CO sub(2) and N Fertilization on Fine Root Dynamics and Fungal Growth in Seedling Pinus Ponderosa

Minirhizotrons were used to monitor the impacts of elevated carbon dioxide and nitrogen fertilization on fine root growth of Pinus ponderosa Dougl. ex P. Laws. C. Laws. during a two-year testing period. The seedlings used for these experiments were raised in native soil in open-top field-exposure ch...

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Bibliographic Details
Published in:Environmental and experimental botany 1997-06, Vol.37 (2), p.73-73
Main Authors: Tingey, David T, Phillips, Donald L, Johnson, Mark G, Storm, Marjorie J, Ball, J T
Format: Article
Language:English
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Summary:Minirhizotrons were used to monitor the impacts of elevated carbon dioxide and nitrogen fertilization on fine root growth of Pinus ponderosa Dougl. ex P. Laws. C. Laws. during a two-year testing period. The seedlings used for these experiments were raised in native soil in open-top field-exposure chambers at a site near Placerville, CA. Seedlings used in the tests were exposed to ambient air (as controls) or ambient air plus one of two levels of elevated CO sub(2) and one of three levels of elevated N. In the second year, plants exposed to elevated CO sub(2) exhibited increased fine root occurence and root length. Elevated N did not appear to affect the seedlings significantly. No remarkable interactions were observed between the CO sub(2) and the N.
ISSN:0098-8472