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Nitrogen limitation of microbial decomposition in a grassland under elevated CO2

Abstract

Carbon accumulation in the terrestrial biosphere could partially offset the effects of anthropogenic CO2 emissions on atmospheric CO2 (refs 1, 2). The net impact of increased CO2 on the carbon balance of terrestrial ecosystems is unclear, however, because elevated CO2 effects on carbon input to soils and plant use of water and nutrients often have contrasting effects on microbial processes3,4,5. Here we show suppression of microbial decomposition in an annual grassland after continuous exposure to increased CO2 for five growing seasons. The increased CO2 enhanced plant nitrogen uptake, microbial biomass carbon, and available carbon for microbes. But it reduced available soil nitrogen, exacerbated nitrogen constraints on microbes, and reduced microbial respiration per unit biomass. These results indicate that increased CO2 can alter the interaction between plants and microbes in favour of plant utilization of nitrogen, thereby slowing microbial decomposition and increasing ecosystem carbon accumulation.

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Figure 1: Below-ground respiration.
Figure 2: Extractable inorganic soil N over the growing season.
Figure 3: Microbial biomass carbon (a), nitrogen (b) and C:N ratios (c) in ambient (open bars) and elevated (filled bars) CO2.
Figure 4: 15N distribution.

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Acknowledgements

We thank H. A. Mooney, C. Lund and B. A. Hungate for contributing to the design and execution of the field experiment, H. L. Zhong for 15N measurements, and P. Brooks for assistance with 13C measurements. The Jasper Ridge CO2 experiment was supported by grants from the National Science Foundation to the Carnegie Institution of Washington, the University of California, Berkeley, and Stanford University. S.H. was supported by the US NSF under a fellowship awarded in 1996.

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Hu, S., Chapin, F., Firestone, M. et al. Nitrogen limitation of microbial decomposition in a grassland under elevated CO2. Nature 409, 188–191 (2001). https://doi.org/10.1038/35051576

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