Short-Term Uptake of 15N by a Grass and Soil Micro-Organisms after Long-Term Exposure to Elevated CO2

Barnard, Romain L.; Barthes, Laure; Leadley, Paul

doi:10.1007/s11104-005-2553-4

Cited by 31 publications

(31 citation statements)

References 31 publications

(35 reference statements)

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“…However, with an estimate of 10-15 kg N ha −1 yr −1 this is likely to be a comparably low contributor in the N balance in any case. The 15 N recovery from slurry (49% ± 7%) is in general agreement with other 15 N tracing studies, including a 24%-62% loss of 15 N labeled slurry in a permanent grass sward in Ireland [43] and a 32% recovery in a 15 NH4 + tracing experiment in grassland mesocosms [45]. Overall 15 N recovery may be slightly underestimated since recovery in belowground biomass remains unmeasured within this…”

Section: 1n Cycling In Montane Grassland Soilsupporting

confidence: 88%

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Management Intensity Controls Nitrogen-Use-Efficiency and Flows in Grasslands—A 15N Tracing Experiment

et al. 2020

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The consequences of land use intensification and climate warming on productivity, fates of fertilizer nitrogen (N) and the overall soil N balance of montane grasslands remain poorly understood. Here, we report findings of a 15N slurry-tracing experiment on large grassland plant–soil lysimeters exposed to different management intensities (extensive vs. intensive) and climates (control; translocation: +2 °C, reduced precipitation). Surface-applied cattle slurry was enriched with both 15NH4+ and 15N-urea in order to trace its fate in the plant–soil system. Recovery of 15N tracer in plants was low (7–17%), while it was considerably higher in the soil N pool (32–42%), indicating N stabilization in soil organic nitrogen (SON). Total 15N recovery was only 49% ± 7% indicating substantial fertilizer N losses to the environment. With harvest N exports exceeding N fertilization rates, the N balance was negative for all climate and management treatments. Intensive management had an increased deficit relative to extensive management. In contrast, simulated climate change had no significant effects on the grassland N balance. These results suggest a risk of soil N mining in montane grasslands under land use intensification based on broadcast liquid slurry application.

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Section: 1n Cycling In Montane Grassland Soilsupporting

confidence: 88%

“…+ tracing experiment in grassland mesocosms [45]. Overall 15 N recovery may be slightly underestimated since recovery in belowground biomass remains unmeasured within this study.…”

Section: N Cycling In Montane Grassland Soilmentioning

confidence: 71%

Management Intensity Controls Nitrogen-Use-Efficiency and Flows in Grasslands—A 15N Tracing Experiment

et al. 2020

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“…The direct effects of warming and CO 2 on plant growth in natural ecosystems can be limited if nutrient stocks are gradually depleted (Arnone et al 2000;Gill et al 2006). However, several examples exist that show no evidence of progressive nitrogen limitation even after several years of treatment with elevated CO 2 in forests (Barnard et al 2006;Norby and Iversen 2006;Phillips et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Root growth and N dynamics in response to multi-year experimental warming, summer drought and elevated CO2 in a mixed heathland-grass ecosystem

Arndal

Schmidt

Beier

et al. 2014

Functional Plant Biol.

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Abstract. Ecosystems exposed to elevated CO 2 are often found to sequester more atmospheric carbon due to increased plant growth. We exposed a Danish heath ecosystem to elevated CO 2 , elevated temperature and extended summer drought alone and in all combinations in order to study whether the expected increased growth would be matched by an increase in root nutrient uptake of NH 4 + -N and NO 3 --N. Root growth was significantly increased by elevated CO 2 . The roots, however, did not fully compensate for the higher growth with a similar increase in nitrogen uptake per unit of root mass. Hence the nitrogen concentration in roots was decreased in elevated CO 2 , whereas the biomass N pool was unchanged or even increased. The higher net root production in elevated CO 2 might be a strategy for the plants to cope with increased nutrient demand leading to a long-term increase in N uptake on a whole-plant basis. Drought reduced grass root biomass and N uptake, especially when combined with warming, but CO 2 was the most pronounced main factor effect. Several significant interactions of the treatments were found, which indicates that the responses were nonadditive and that changes to multiple environmental changes cannot be predicted from single-factor responses alone.

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“…Indeed, elevated CO 2 may alter soil substrate availability for nitrifiers by altering NH 4 + production rates as a consequence of higher labile carbon inputs to the soil, but the magnitude and direction of changes in mineralization vary considerably between studies (Hoosbeek et al 2006;Hungate 1999;Reich et al 2006b). In addition, elevated CO 2 may alter soil substrate availability for nitrifiers by altering competition for NH 4 + between nitrifiers and other NH 4 + consumers: CO 2 can stimulate plant and heterotrophic microbial growth and associated NH 4 + plant and microbial uptake (Barnard et al 2006a;Hu et al 2001). Such effects are likely to depend on soil N status, since plant and microbial growth are often N limited (Hu et al 2006;Vitousek and Howarth 1991).…”

Section: Introductionmentioning

confidence: 99%

Responses of soil nitrogen cycling to the interactive effects of elevated CO2 and inorganic N supply

et al. 2009

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Despite increasing interest in the effects of climate change on soil processes, the response of nitrification to elevated CO 2 remains unclear. Responses may depend on soil nitrogen (N) status, and inferences may vary depending on the methodological approach used. We investigated the interactive effects of elevated CO 2 and inorganic N supply on gross nitrification (using 15 N pool dilution) and potential nitrification (using nitrifying enzyme activity assays) in Dactylis glomerata mesocosms. We measured the responses of putative drivers of nitrification (NH 4 + production, NH 4 + consumption, and soil environmental conditions) and of potential denitrification, a process functionally linked to nitrification. Gross nitrification was insensitive to all treatments, whereas potential nitrification was higher in the high N treatment and was further stimulated by elevated CO 2 in the high N treatment. Gross mineralization and NH 4 + consumption rates were also significantly increased in response to elevated CO 2 in the high N treatment, while potential denitrification showed a significant increase in response to N addition. The discrepancy between the responses of gross and potential nitrification to elevated CO 2 and inorganic N supply suggest that these measurements provide different information, and should be used as complementary approaches to understand nitrification response to global change.

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Short-Term Uptake of 15N by a Grass and Soil Micro-Organisms after Long-Term Exposure to Elevated CO2

Cited by 31 publications

References 31 publications

Management Intensity Controls Nitrogen-Use-Efficiency and Flows in Grasslands—A 15N Tracing Experiment

Management Intensity Controls Nitrogen-Use-Efficiency and Flows in Grasslands—A 15N Tracing Experiment

Root growth and N dynamics in response to multi-year experimental warming, summer drought and elevated CO2 in a mixed heathland-grass ecosystem

Responses of soil nitrogen cycling to the interactive effects of elevated CO2 and inorganic N supply

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