Inorganic and organic synergies in enhanced weathering to promote carbon dioxide removal

作者：Feng Tao, Benjamin Z. Houlton · 发表于：Global Change Biology · 年份：2024 · DOI：10.1111/gcb.17132 · 被引用次数：21 · 研究领域：CO2 Sequestration and Geologic Interactions、Peatlands and Wetlands Ecology、Soil Carbon and Nitrogen Dynamics

Scientifically verifiable, durable, and scalable carbon dioxide removal (CDR) technologies are essential to reducing atmospheric CO2 concentrations and avoiding the most dangerous impacts of climate change this century. Within the nature-based solution portfolios, the soil system provides promising CDR and sequestration potential, including in both organic and inorganic forms at time scales that reflect durable removals (Smith et al., 2023)—those that exceed 100 years or longer. Soil organic carbon (SOC) and inorganic carbon (SIC) collectively preserve more than eight times as much carbon as does vegetation. Their changes determine the magnitudes of soil carbon sequestration and have profound impacts on the global carbon cycle. A critical challenge is to grow the total amount of carbon in soil pools in a way that is scientifically verifiable and scalable to the billions of tons of CDR needed to stabilize and reverse global warming. Buss et al. (2024) revealed a key interface—organo-mineral association—between soil inorganic and organic carbon dynamics to promote soil carbon sequestration, highlighting a bridge between inorganic and organic soil carbon chemistry. Soils in the first 2 m store more than 2000 billion tons carbon as organic matter globally. While plants provide the very original carbon source for soils via their litterfall, root exudation, and mortality, the formation and stabilization of SOC involves more complex belowground processes such as microbial activities...