Enhancing natural cycles in agro-ecosystems to boost plant carbon capture and soil storage

Buss, Wolfram; Yeates, Kirsty; Rohling, Eelco J.

doi:10.1093/oxfclm/kgab006

Cited by 7 publications

(4 citation statements)

References 128 publications

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“…Such action must include both significant reduction in greenhouse gas emissions and atmospheric greenhouse gas removal largely via land management change (IPCC, 2022). Several promising greenhouse gas removal methods are based on utilising natural cycles to capture and store atmospheric carbon dioxide (Buss, Yeates, et al., 2021; Fuss et al., 2018). These include plant‐derived soil organic carbon formation and enhanced rock weathering.…”

Section: Introductionmentioning

confidence: 99%

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Stabilisation of soil organic matter with rock dust partially counteracted by plants

Buss,

Hasemer,

Ferguson

et al. 2023

Global Change Biology

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Soil application of Ca‐ and Mg‐rich silicates can capture and store atmospheric carbon dioxide as inorganic carbon but could also have the potential to stabilise soil organic matter (SOM). Synergies between these two processes have not been investigated. Here, we apply finely ground silicate rock mining residues (basalt and granite blend) to a loamy sand in a pot trial at a rate of 4% (equivalent to 50 t ha−1) and investigate the effects of a wheat plant and two watering regimes on soil carbon sequestration over the course of 6 months. Rock dust addition increased soil pH, electric conductivity, inorganic carbon content and soil‐exchangeable Ca and Mg contents, as expected for weathering. However, it decreased exchangeable levels of micronutrients Mn and Zn, likely related to the elevated soil pH. Importantly, it increased mineral‐associated organic matter by 22% due to the supply of secondary minerals and associated sites for SOM sorption. Additionally, in the nonplanted treatments, rock supply of Ca and Mg increased soil microaggregation that subsequently stabilised labile particulate organic matter as organic matter occluded in aggregates by 46%. Plants, however, reduced soil‐exchangeable Mg and Ca contents and hence counteracted the silicate rock effect on microaggregates and carbon within. We suggest this cation loss might be attributed to plant exudates released to solubilise micronutrients and hence neutralise plant deficiencies. The effect of enhanced silicate rock weathering on SOM stabilisation could substantially boost its carbon sequestration potential.

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Section: Introductionmentioning

confidence: 99%

“…Several promising greenhouse gas removal methods are based on utilising natural cycles to capture and store atmospheric carbon dioxide (Buss, Yeates, et al, 2021;Fuss et al, 2018). These include plant-derived soil organic carbon formation and enhanced rock weathering.…”

Section: Introductionmentioning

confidence: 99%

Stabilisation of soil organic matter with rock dust partially counteracted by plants

Buss,

Hasemer,

Ferguson

et al. 2023

Global Change Biology

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“…Decarbonizing industry while developing NETs is a daunting challenge. Geochemical NETs could potentially reduce the need for land-or energy-intensive carbon removal approaches, as well as enhance synergetic approaches, such as coupling with biochar or DAC (Buss et al, 2021). Further, wide-scale deployment of geochemical NETs could help enable some of the world's largest industries, including agriculture, concrete, mining, shipping, and steel, to reduce their emissions, toward net zero and perhaps even achieve net negative, in line with global climate targets.…”

Section: Discussionmentioning

confidence: 99%

Geochemical Negative Emissions Technologies: Part II. Roadmap

et al. 2022

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Geochemical negative emissions technologies (NETs) comprise a set of approaches to climate change mitigation that make use of alkaline minerals to remove and/or permanently store carbon dioxide (CO2) as solid carbonate minerals or dissolved ocean bicarbonate ions. This roadmap accompanies the comprehensive review of geochemical NETs by the same authors and offers guidance for the development and deployment of geochemical NETs at gigaton per year (Gt yr.−1) scale. We lay out needs and high-priority initiatives across six key elements required for the responsible and effective deployment of geochemical NETs: (i) technical readiness, (ii) social license, (iii) demand, (iv) supply chains, (v) human capital, and (vi) infrastructure. We put forward proposals for: specific initiatives to be undertaken; their approximate costs and timelines; and the roles that various actors could play in undertaking them. Our intent is to progress toward a working consensus among researchers, practitioners, and key players about initiatives that merit resourcing and action, primarily focusing on the near-term.

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“…Such action must include both significant reduction in greenhouse gas emissions, and atmospheric greenhouse gas removal largely via land change (IPCC, 2022). Several promising greenhouse gas removal methods are based on utilising natural cycles to capture and store atmospheric carbon dioxide (Buss, Yeates, et al, 2021;Fuss et al, 2018). These include soil organic carbon from plants and enhanced rock weathering.…”

Section: Introductionmentioning

confidence: 99%

Stabilisation of soil organic matter with rock dust partially counteracted by plants

Buss¹,

Hasemer²,

Ferguson³

2023

Preprint

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Soil application of Ca- and Mg-rich silicates can capture and store atmospheric carbon dioxide as inorganic carbon but could also have the potential to stabilise soil organic matter (SOM). Synergies between these two processes have not been investigated. Here, we apply finely ground silicate rock mining residues (basalt and granite blend) to a loamy sand in a pot trial at a rate of 4% (equivalent to 50 t ha-1) and investigate the effects of a wheat plant and two watering regimes on soil carbon sequestration. Rock dust addition increased soil pH, electric conductivity and soil-exchangeable Ca and Mg contents, as expected for weathering, but decreased exchangeable levels of micronutrients Mn and Zn, likely related to soil pH. Importantly, it increased mineral-associated organic matter by 22% due to the supply of secondary minerals and associated sites for SOM sorption. Additionally, in the non-planted treatments, rock supply of Ca and Mg increased soil microaggregation that subsequently stabilised labile particulate organic matter as organic matter occluded in aggregates by 46%. Plants, however, reduced soil exchangeable Mg and Ca contents and hence counteracted the silicate rock effect on microaggregates and carbon within. We attribute this cation loss to plant exudates released to solubilise micronutrients and hence neutralise plant deficiencies. The effect of enhanced silicate rock weathering on SOM stabilisation could substantially boost its carbon sequestration potential when pH and micronutrient effects are considered

show abstract

Enhancing natural cycles in agro-ecosystems to boost plant carbon capture and soil storage

Cited by 7 publications

References 128 publications

Stabilisation of soil organic matter with rock dust partially counteracted by plants

Stabilisation of soil organic matter with rock dust partially counteracted by plants

Geochemical Negative Emissions Technologies: Part II. Roadmap

Stabilisation of soil organic matter with rock dust partially counteracted by plants

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