Schlagwort: soil carbon sequestration

Ulysse Gaudaré, Matthias Kuhnert, Pete Smith, Manuel Martin, Pietro Barbieri, Sylvain Pellerin, Thomas Nesme IN: Nat. Clim. Chang. (2023). https://doi.org/10.1038/s41558-023-01721-5

Here the authors use a spatially explicit biogeochemical model to show that the complete conversion of global cropland to organic farming without the use of cover crops and plant residue (normative scenario) will result in a 40% reduction of global soil carbon input and 9% decline in SOC stock. An optimal organic scenario that supports widespread cover cropping and enhanced residue recycling will reduce global soil carbon input by 31%, and SOC can be preserved after 20 yr following conversion to organic farming.

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Isabella Chiaravalloti, Nicolas Theunissen, Shuang Zhang, Jiuyuan Wang, Fengchao Sun, Ayesha A. Ahmed, Evelin Pihlap, Christopher T. Reinhard, Noah J. Planavsky IN: Front. Clim., Sec. Negative Emission Technologies 5, https://doi.org/10.3389/fclim.2023.1203043

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 N₂O emissions. Here, the authors continuously measure N₂O 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 N₂O fluxes. They observe significant decreases in cumulative N₂O emissions (between 29–32%) from mesocosm systems with basalt addition.

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Husen Qiu, Zhuangzhuang Hu, Jieyun Liu, Haiyang Zhang, Weiliang Shen IN: Agronomy 13(5), 1385; https://doi.org/10.3390/agronomy13051385

Biochar is useful for soil organic carbon (SOC) sequestration. However, the effects of biochar aging and addition rates on SOC stabilization are unclear. A field experiment with four biochar application rates (0% (control), 1% (LB), 2% (MB), and 4% (HB) of dry fluvo-aquic soil) was conducted. Soil samples were sampled after 8, 12, and 24 months of its application to clarify the question.

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Aaron M. Prairie, Alison E. King, M. Francesca Cotrufo IN: PNAS, https://doi.org/10.1073/pnas.2217481120

To better understand soil organic carbon (SOC ) formation and persistence, the authors separate it into two distinct forms, particulate organic carbon (POC) and mineral associated (MAOC). This study presents results from a global meta-analysis on the response of SOC, POC, and MAOC, to regenerative agricultural practices including no-till, cropping system intensification, and integrated crop–livestock (ICL). The authors found that regenerative practices increased both POC and MAOC, thus improving soil health and promoting long-term carbon storage.

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Serge Wiltshire, Brian Beckage IN: PLOS Climate, https://doi.org/10.1371/journal.pclm.0000130

Computational models can project how changes in land use and management will affect soil organic carbon (SOC) stocks over time, but these models usually assume an unchanging climate. The authors investigate how incorporating climate change projections affects carbon sequestration and SOC stocks. They apply the Rothamsted Carbon model (RothC) to study agricultural land use and management transitions in the U.S. state of Vermont, comparing several regenerative farming strategies, as well as afforestation, against business-as-usual. In 11 relatively-homogeneous Ecoregions within the study area, they run simulations for each land management scenario from 2022–2099, under both projected climate change and the static climate normal from 1991–2021.

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