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• W2077897344 abstract "Three perennial grass species, perennial ryegrass ( Lolium perenne L.), colonial bentgrass ( Agrostis capillaris L.), and sheep fescue ( Festuca ovina L.), were grown at two CO 2 concentrations (350 and 700 μL L −1 ) and under two N regimes: one with a minor addition of 8 kg N ha −1 and one with an addition of ≈278 kg N ha −1 , both labeled with 15 N. The effects of elevated CO 2 on 15 N and N uptake and dynamics in the plant–soil systems were determined after 32 and 55 d, with close attention to the rhizosphere. Total N uptake by the plants was not affected by elevated CO 2 , compared with ambient CO 2 , independent of N treatment and grass species. A clear decrease from 1.77 at ambient CO 2 to 1.25 at elevated CO 2 was observed in the shoot/root (S/R) ratio of N, resulting from a significant decrease of the N concentration in shoots, and an unchanged root N concentration. At 700 μL L −1 CO 2 , N concentration in the shoots decreased from 12.9 to 9.9 g kg −1 , even at the low N supply, whereas the slight decrease in root N concentration for plants grown at elevated CO 2 (7.9 vs. 7.3 g kg −1 ) was not significantly different. The relative increase of 15 N found in the rhizosphere soil microbial biomass (SMB) and the rhizosphere soil residue under elevated CO 2 was too small to affect plant growth, even in the low N treatment. The total amount of 15 N recovered in the plants was not affected by the CO 2 treatment. Although at the second harvest slightly more 15 N was found in the plants than at the first harvest, probably due to turnover of the SMB, no interaction with CO 2 was observed. This shows that the fertilizer 15 N had not been immobilized to a larger extent or for a longer time by the SMB at elevated CO 2 than under ambient CO 2 , even independent of N level and grass species. No evidence was found that under elevated CO 2 substantial amounts of N had been immobilized by the SMB, nor that mineralization of native soil organic matter (SOM) had been stimulated by an increased supply of substrate to the SMB. We conclude that elevated CO 2 has the potential to induce significant changes in plant N nutrition, modifying N allocation and tissue quality within perennial grasses, but that these effects appear to be independent of the SMB." @default.
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• W2077897344 date "1999-11-01" @default.
• W2077897344 modified "2023-09-27" @default.
• W2077897344 title "Elevated Carbon Dioxide Effects on Nitrogen Dynamics in Grasses, with Emphasis on Rhizosphere Processes" @default.
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• W2077897344 doi "https://doi.org/10.2136/sssaj1999.6361695x" @default.
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