Abstract
AbstractQuantifying the upper limit of stable soil carbon storage is essential for guiding policies to increase soil carbon storage. One pool of carbon considered particularly stable across climate zones and soil types is formed when dissolved organic carbon sorbs to minerals. We quantified, for the first time, the potential of mineral soils to sorb additional dissolved organic carbon (DOC) for six soil orders. We compiled 402 laboratory sorption experiments to estimate the additional DOC sorption potential, that is the potential of excess DOC sorption in addition to the existing background level already sorbed in each soil sample. We estimated this potential using gridded climate and soil geochemical variables within a machine learning model. We find that mid- and low-latitude soils and subsoils have a greater capacity to store DOC by sorption compared to high-latitude soils and topsoils. The global additional DOC sorption potential for six soil orders is estimated to be 107 $$\pm$$
±
13 Pg C to 1 m depth. If this potential was realized, it would represent a 7% increase in the existing total carbon stock.
Funder
H2020 Marie Skłodowska-Curie Actions
National Institute of Food and Agriculture
Agence Nationale de la Recherche
Biological and Environmental Research
Campus France
Publisher
Springer Science and Business Media LLC
Subject
Earth-Surface Processes,Water Science and Technology,Environmental Chemistry
Cited by
33 articles.
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