Articles | Volume 18, issue 1
https://doi.org/10.5194/bg-18-55-2021
https://doi.org/10.5194/bg-18-55-2021
Research article
 | 
05 Jan 2021
Research article |  | 05 Jan 2021

Deepening roots can enhance carbonate weathering by amplifying CO2-rich recharge

Hang Wen, Pamela L. Sullivan, Gwendolyn L. Macpherson, Sharon A. Billings, and Li Li

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Cited articles

Abongwa, P. T. and Atekwana, E. A.: Controls on the chemical and isotopic composition of carbonate springs during evolution to saturation with respect to calcite, Chem. Geol., 404, 136–149, https://doi.org/10.1016/j.chemgeo.2015.03.024, 2015. 
Ahrens, B., Braakhekke, M. C., Guggenberger, G., Schrumpf, M., and Reichstein, M.: Contribution of sorption, DOC transport and microbial interactions to the 14C age of a soil organic carbon profile: Insights from a calibrated process model, Soil Biol. Biochem., 88, 390–402, https://doi.org/10.1016/j.soilbio.2015.06.008, 2015. 
Andrews, J. A. and Schlesinger, W. H.: Soil CO2 dynamics, acidification, and chemical weathering in a temperate forest with experimental CO2 enrichment, Global Biogeochem. Cy., 15, 149–162, https://doi.org/10.1029/2000gb001278, 2001. 
Angers, D. A. and Caron, J.: Plant-induced changes in soil structure: Processes and feedbacks, Biogeochemistry, 42, 55–72, https://doi.org/10.1023/a:1005944025343, 1998. 
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Short summary
Carbonate weathering is essential in regulating carbon cycle at the century timescale. Plant roots accelerate weathering by elevating soil CO2 via respiration. It however remains poorly understood how and how much rooting characteristics modify flow paths and weathering. This work indicates that deepening roots in woodlands can enhance carbonate weathering by promoting recharge and CO2–carbonate contact in the deep, carbonate-abundant subsurface.
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