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- W2000557587 abstract "Increased belowground labile C inputs under elevated [CO 2 ] could stimulate nonsymbiotic N 2 fixation, thereby enhancing growth responses of vegetation to elevated [CO 2 ] on nutrient-poor sites. To test this hypothesis, nonsymbiotic N 2 fixation rates in soils planted with 3-year-old Jeffrey pine (Pinus jeffreyi Grev. & Balf.) trees grown under 365 and 700 µL·L 1 atmospheric [CO 2 ] were measured by exposing the soil to 15 N 2 -enriched air for 78 d. Nitrogen fixation rates were estimated by measuring 15 N content of trees and soil. Compared with the ambient CO 2 treatment, the elevated CO 2 treatment did not affect biomass, N content, or δ 15 N of individual plant parts and soils, indicating that elevated [CO 2 ] did not stimulate nonsymbiotic N 2 fixation. Because belowground C inputs did not increase under elevated [CO 2 ], the initial hypothesis could not be accepted or rejected. The results from the 15 N 2 labeling study agree with other studies showing that nonsymbiotic N 2 fixation is not likely to provide a large input of N in forest ecosystems. The 15 N 2 labeling technique was promising for studying N 2 fixation in plantsoil systems, but the preliminary nature of this study did not allow for firm conclusions with regard to the effects of elevated [CO 2 ]." @default.
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- W2000557587 date "2004-09-01" @default.
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- W2000557587 title "Nonsymbiotic nitrogen fixation in 3-year-old Jeffrey pines and the role of elevated [CO2]" @default.
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- W2000557587 doi "https://doi.org/10.1139/x04-077" @default.
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