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Is the climate change mitigation effect of enhanced silicate weathering governed by biological processes?
Global Change Biology ( IF 10.8 ) Pub Date : 2021-11-13 , DOI: 10.1111/gcb.15993
Sara Vicca 1 , Daniel S Goll 2 , Mathilde Hagens 3 , Jens Hartmann 4 , Ivan A Janssens 1 , Anna Neubeck 5 , Josep Peñuelas 6, 7 , Sílvia Poblador 1 , Jet Rijnders 1 , Jordi Sardans 6, 7 , Eric Struyf 1 , Philipp Swoboda 8 , Jan Willem van Groenigen 9 , Arthur Vienne 1 , Erik Verbruggen 1
Affiliation  

A number of negative emission technologies (NETs) have been proposed to actively remove CO2 from the atmosphere, with enhanced silicate weathering (ESW) as a relatively new NET with considerable climate change mitigation potential. Models calibrated to ESW rates in lab experiments estimate the global potential for inorganic carbon sequestration by ESW at about 0.5–5 Gt CO2 year−1, suggesting ESW could be an important component of the future NETs mix. In real soils, however, weathering rates may differ strongly from lab conditions. Research on natural weathering has shown that biota such as plants, microbes, and macro-invertebrates can strongly affect weathering rates, but biotic effects were excluded from most ESW lab assessments. Moreover, ESW may alter soil organic carbon sequestration and greenhouse gas emissions by influencing physicochemical and biological processes, which holds the potential to perpetuate even larger negative emissions. Here, we argue that it is likely that the climate change mitigation effect of ESW will be governed by biological processes, emphasizing the need to put these processes on the agenda of this emerging research field.

中文翻译:

增强的硅酸盐风化减缓气候变化的效果是否受生物过程控制?

已经提出了一些负排放技术 (NET) 来积极地从大气中去除 CO 2,增强型硅酸盐风化 (ESW) 作为一种相对较新的 NET,具有相当大的气候变化缓解潜力。在实验室实验中根据 ESW 速率校准的模型估计,ESW 对无机碳封存的全球潜力约为 0.5–5 Gt CO 2 年-1,表明 ESW 可能是未来 NET 组合的重要组成部分。然而,在真实土壤中,风化速率可能与实验室条件有很大不同。自然风化研究表明,植物、微生物和大型无脊椎动物等生物群可以强烈影响风化速率,但大多数 ESW 实验室评估都排除了生物效应。此外,ESW 可能通过影响物理化学和生物过程来改变土壤有机碳固存和温室气体排放,这有可能使更大的负排放长期存在。在这里,我们认为 ESW 的气候变化减缓效应很可能会受到生物过程的控制,强调需要将这些过程纳入这一新兴研究领域的议程。
更新日期:2022-01-05
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