In:
Frontiers in Climate, Frontiers Media SA, Vol. 5 ( 2023-6-22)
Abstract:
Nitrous oxide (N 2 O) is a potent and long-lived greenhouse gas that accounts for roughly 6% of global anthropogenic greenhouse gas emissions, and it has risen from its preindustrial concentration of 270 ppb N 2 O to 332 ppb N 2 O as a result of human activities. The majority of anthropogenic N 2 O emissions (52–80%) come from agricultural settings due to high rates of reactive nitrogen fertilizer application. Amending soils with fine-grained basalt is gaining traction as a carbon dioxide removal (CDR) pathway, and model simulations suggest that this process may also significantly decrease soil N 2 O emissions. Here, we continuously measure N 2 O fluxes from large-scale maize mesocosms in a greenhouse setting and use a machine learning framework to assess the relative importance of the levers on N 2 O fluxes. We observe significant decreases in cumulative N 2 O emissions (between 29–32%) from mesocosm systems with basalt addition. We find that basalt application rate, soil pH, and surface soil moisture are the strongest levers on N 2 O emissions depending on the system settings. These results provide empirical support for a potentially significant co-benefit of deploying enhanced rock weathering of silicates (ERW) on managed lands, particularly those subject to elevated rates of reactive nitrogen input.
Type of Medium:
Online Resource
ISSN:
2624-9553
DOI:
10.3389/fclim.2023.1203043
DOI:
10.3389/fclim.2023.1203043.s001
DOI:
10.3389/fclim.2023.1203043.s002
DOI:
10.3389/fclim.2023.1203043.s003
DOI:
10.3389/fclim.2023.1203043.s004
DOI:
10.3389/fclim.2023.1203043.s005
DOI:
10.3389/fclim.2023.1203043.s006
DOI:
10.3389/fclim.2023.1203043.s007
DOI:
10.3389/fclim.2023.1203043.s008
DOI:
10.3389/fclim.2023.1203043.s009
DOI:
10.3389/fclim.2023.1203043.s010
DOI:
10.3389/fclim.2023.1203043.s011
Language:
Unknown
Publisher:
Frontiers Media SA
Publication Date:
2023
detail.hit.zdb_id:
2986708-3
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