Quantification of CO2 uptake by enhanced weathering of silicate minerals applied to acidic soils
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Quantification of CO2 uptake by enhanced weathering of silicate minerals applied to acidic soils. / Dietzen, Christiana; Rosing, Minik T.
In: International Journal of Greenhouse Gas Control, Vol. 125, 103872, 2023.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Quantification of CO2 uptake by enhanced weathering of silicate minerals applied to acidic soils
AU - Dietzen, Christiana
AU - Rosing, Minik T.
N1 - Publisher Copyright: © 2023
PY - 2023
Y1 - 2023
N2 - The application of ground silicate minerals to agricultural soils has been proposed as a method for taking up CO2 by enhancing the weathering rate of these minerals through their exposure to soil acids. Alternatively, glacial rock flour, a finely grained material which is abundantly available without the need for energy-intensive grinding, could be used. However, simple and inexpensive methods for determining the amount of CO2 taken up as a result of weathering of applied minerals are still needed, and the impact of non-carbonic acids on CO2 uptake has yet to be accounted for. Here, we present a protocol for correcting estimates of CO2 uptake due to enhanced mineral weathering to account for weathering by non-carbonic soil acids. We determine that soils with a pH below 6.3 need correction for weathering by other acids than carbonic acid and that, given the impact of non-carbonic acids, soils with a pH below 5.2 may not be ideal candidates for mineral applications aimed at CO2 uptake, depending on the pCO2. We report an estimated CO2 uptake of 728 kg CO2 ha−1 after the application of 50 tons ha−1 of Greenlandic glacial rock flour to an acidic, sandy soil in Denmark over 3 years.
AB - The application of ground silicate minerals to agricultural soils has been proposed as a method for taking up CO2 by enhancing the weathering rate of these minerals through their exposure to soil acids. Alternatively, glacial rock flour, a finely grained material which is abundantly available without the need for energy-intensive grinding, could be used. However, simple and inexpensive methods for determining the amount of CO2 taken up as a result of weathering of applied minerals are still needed, and the impact of non-carbonic acids on CO2 uptake has yet to be accounted for. Here, we present a protocol for correcting estimates of CO2 uptake due to enhanced mineral weathering to account for weathering by non-carbonic soil acids. We determine that soils with a pH below 6.3 need correction for weathering by other acids than carbonic acid and that, given the impact of non-carbonic acids, soils with a pH below 5.2 may not be ideal candidates for mineral applications aimed at CO2 uptake, depending on the pCO2. We report an estimated CO2 uptake of 728 kg CO2 ha−1 after the application of 50 tons ha−1 of Greenlandic glacial rock flour to an acidic, sandy soil in Denmark over 3 years.
KW - Alkalinity
KW - Carbon sequestration
KW - Enhanced rock weathering
KW - Glacial rock flour
KW - Silicate minerals
KW - Soil amendment
U2 - 10.1016/j.ijggc.2023.103872
DO - 10.1016/j.ijggc.2023.103872
M3 - Journal article
AN - SCOPUS:85150458997
VL - 125
JO - International Journal of Greenhouse Gas Control
JF - International Journal of Greenhouse Gas Control
SN - 1750-5836
M1 - 103872
ER -
ID: 346411066