Soil carbon management and enhanced rock weathering: The separate fates of organic and inorganic carbon

IF 4 2区 农林科学 Q2 SOIL SCIENCE European Journal of Soil Science Pub Date : 2024-07-09 DOI:10.1111/ejss.13534
David A. C. Manning, Antonio Carlos de Azevedo, Caio F. Zani, Arlete S. Barneze
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Abstract

Soil carbon (C) management has been promoted as one of the few readily available strategies to mitigate the rising concentration of atmospheric CO2 and its associated impacts on climate change. One of these carbon management strategies is enhanced rock weathering (ERW) which involves adding crushed silicate rocks to the soil. These rocks weather and remove atmospheric CO2 by converting it into bicarbonate in solution. The approach requires careful interpretation of the differences between soil organic carbon (SOC) and soil inorganic carbon (SIC) and their measurement, with implications for land management and C credit accounting. In this Opinion, we emphasise the distinct nature and fates of SOC and SIC, advocating for their separate management, particularly in C credit schemes. It is imperative that protocols for soil C management explicitly recognise the difference between SOC and SIC to prevent any ambiguity. Farmers should be able to claim credits for increases in SOC alongside and independently of any claim for credits for ERW (i.e. SIC). Despite the potential of ERW for C removal, we emphasise that further research is needed to improve the measurement and monitoring of SIC and to understand ERW's potential implications for SOC turnover and greenhouse gas emissions.

Highlights

  • Enhanced Rock Weathering increases dissolved inorganic carbon (bicarbonate).
  • Soil organic carbon (SOC) may be influenced by Enhanced Rock Weathering.
  • Carbon credit via Enhanced Rock Weathering is separate from credit linked to soil organic carbon.
  • Soil organic matter and enhanced rock weathering both have roles to play for carbon credits.

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土壤碳管理与强化岩石风化:有机碳和无机碳的不同命运
土壤碳(C)管理是缓解大气中二氧化碳浓度上升及其对气候变化的相关影响的少数可用策略之一。其中一种碳管理策略是加强岩石风化(ERW),即在土壤中添加碎硅酸盐岩石。这些岩石通过将大气中的二氧化碳转化为溶液中的碳酸氢盐来风化和清除大气中的二氧化碳。这种方法需要仔细解释土壤有机碳 (SOC) 和土壤无机碳 (SIC) 之间的差异及其测量方法,并对土地管理和碳信用核算产生影响。在本意见书中,我们强调了土壤有机碳和土壤无机碳的不同性质和命运,主张对它们进行单独管理,特别是在碳信用计划中。土壤碳管理规程必须明确承认 SOC 和 SIC 的区别,以防止出现任何歧义。农民应能在申请战争遗留爆炸物(即 SIC)抵免额度的同时,申请 SOC 的抵免额度。尽管岩石风化工程具有去除碳的潜力,但我们强调,还需要进一步研究,以改进 SIC 的测量和监测,并了解岩石风化工程对 SOC 转化和温室气体排放的潜在影响。土壤有机碳(SOC)可能受到强化岩石风化的影响。通过强化岩石风化作用获得的碳信用与土壤有机碳信用是分开的。土壤有机质和岩石风化作用都可产生碳汇。
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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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