<b>Biochar-amended soil can further sorb atmospheric CO</b><sub><strong>2</strong></sub><b> for more carbon sequestration</b>
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Input of biochar into soil is considered as an efficient technology for carbon sequestration. This work is aimed to explore if the extra sorption of carbon dioxide (CO<sub>2</sub>) exists in the biochar-amended soil, which has not yet received attention. Here we put biochar and mineral-rich biochar into soils to perform laboratory CO<sub>2</sub> sorption experiments. Our results demonstrate that all biochars increased soil carbon storage and meanwhile further sorb CO<sub>2</sub> for more carbon sequestration. The calcium or magnesium-rich biochar could react with more CO<sub>2 </sub>and eventually be converted into inorganic carbonate minerals in soils. Further, the country-level prediction showed that all cultivated topsoils with biochar application in China could achieve 7.38-12.5 billion tons of carbon sequestration and an additional 0.34-2.66 billion tons of CO₂ sorption. The results require us to take into consideration of both carbon sink and extra CO<sub>2</sub> sorption in the assessment of biochar carbon sequestration potential in soil.
