Articles | Volume 20, issue 3
https://doi.org/10.5194/bg-20-505-2023
https://doi.org/10.5194/bg-20-505-2023
Research article
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02 Feb 2023
Research article | Highlight paper |  | 02 Feb 2023

The influence of elevated CO2 and soil depth on rhizosphere activity and nutrient availability in a mature Eucalyptus woodland

Johanna Pihlblad, Louise C. Andresen, Catriona A. Macdonald, David S. Ellsworth, and Yolima Carrillo

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Cited articles

Achat, D. L., Augusto, L., Gallet-Budynek, A., and Loustau, D.: Future challenges in coupled C–N–P cycle models for terrestrial ecosystems under global change: a review, Biogeochemistry, 131, 173–202, https://doi.org/10.1007/s10533-016-0274-9, 2016. 
Adeleke, R., Nwangburuka, C., and Oboirien, B.: Origins, roles and fate of organic acids in soils: A review, South Afr. J. Bot., 108, 393–406, https://doi.org/10.1016/j.sajb.2016.09.002, 2017. 
Ainsworth, E. A. and Long, S. P.: What have we learned from 15 years of free-air CO2 enrichment (FACE)? A meta-analytic review of the responses of photosynthesis, canopy properties and plant production to rising CO2, New Phytol., 165, 351–372, https://doi.org/10.1111/j.1469-8137.2004.01224.x, 2005. 
Allison, S. D. and Vitousek, P. M.: Responses of extracellular enzymes to simple and complex nutrient inputs, Soil Biol. Biochem., 37, 937–944, https://doi.org/10.1016/j.soilbio.2004.09.014, 2005. 
Andresen, L. C., Carrillo, Y., Macdonald, C. A., Castañeda-Gómez, L., Bodé, S., and Rütting, T.: Nitrogen dynamics after two years of elevated CO2 in phosphorus limited Eucalyptus woodland, Biogeochemistry, 150, 297–312, https://doi.org/10.1007/s10533-020-00699-y, 2020. 
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This paper advances our understanding of forest responses to elevated CO2 by considering implications for nutrient availability across the soil profile and the particular role of nutrient recycling in the rhizosphere versus soil organic matter mineralization.
Short summary
Elevated CO2 in the atmosphere increases forest biomass productivity when growth is not limited by soil nutrients. This study explores how mature trees stimulate soil availability of nitrogen and phosphorus with free-air carbon dioxide enrichment after 5 years of fumigation. We found that both nutrient availability and processes feeding available pools increased in the rhizosphere, and phosphorus increased at depth. This appears to not be by decomposition but by faster recycling of nutrients.
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