![]() ![]() In fact, biochar addition to soils could increase soil organic C (SOC) by an average of 39%, i.e., 6–8-fold of the SOC increase from conservation tillage and cover crops 4. Biochar is produced by heating organic materials under oxygen-limited conditions (i.e., pyrolysis) 12, which results in more recalcitrant and persistent C-rich material 13. Agriculture can contribute to substantial C sequestration by recycling organic materials into soil C pools, thereby enhancing food security and mitigating climate change 6, 7.Īmong the many soil organic amendments under consideration (e.g., fresh crop residues, manure, biosolids, and biochar), biochar has great potential for increasing soil C stocks 8, 9, 10, 11. The urgency of climate change mitigation was highlighted at the 26 th United Nations Framework Convention on Climate Change (UNFCCC) Conference of the Parties (COP26) in Glasgow in 2021 5. Increasing carbon (C) storage in soils could be a promising strategy to mitigate climate change by sequestering atmospheric CO 2 into the soil C pool 2 while improving soil health and crop productivity 3, 4. Similar content being viewed by othersĭeployment of large-scale negative emission technologies is needed to curb average global warming to <2 ☌ or possibly <1.5 ☌ above preindustrial levels to meet the overarching climate goal of the Paris Agreement 1. Overall, biochar-plant interactions drive more nonbiochar C sequestration in the topsoil, and the changes of nonbiochar C in planted soils following biochar addition should be quantified to better assess the soil C sequestration potential in agricultural lands. However, biochar amendment had no effect on the content of nonbiochar organic C in the subsoil. The nonbiochar C content of topsoil was not affected by biochar addition in the absence of rice plants, but was significantly increased by 4.5% in the presence of rice plants, which could result from increases in the soil macroaggregate fraction, iron (Fe)-bound nonbiochar organic C content, and fungal biomass collectively. Here we conducted a 365-day soil microcosm experiment with and without adding 13C-labeled biochar into topsoil to quantify changes in nonbiochar C in the topsoil and subsoil in the presence or absence of rice plants and to determine the mechanisms by which biochar controls nonbiochar C accrual in the soil profile. However, it remains elusive on how biochar addition influences nonbiochar C in soils and its mechanisms, especially in the presence of plants. Soil amendment with biochar is being promoted as a promising strategy for carbon (C) stabilization and accrual, which are key to climate change mitigation. ![]()
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