在增强岩石气候变化中平衡有机和无机碳动态:对碳封存的影响
Kaiyu Lei1, Franziska B Bucka1,2, Pedro P C Teixeira1
1Chair of Soil Science, School of Life Science, Technical University of Munich, Freising, Germany.
Global change biology
|April 16, 2025
概括
增强岩石风化 (ERW) 可以去除二氧化碳,但影响土壤有机碳 (SOC). 新鲜的玄武岩增加了无机碳 (IC),但损失了SOC,而经过气候变化的玄武岩稳定了土壤碳,突出了维持SOC的必要性,以有效地封存碳.
科学领域:
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
- 碳封存是一种碳封存技术.
背景情况:
- 增强岩石风化 (ERW) 是一种关键的二氧化碳去除策略,主要是通过无机碳 (IC) 捕获.
- 对于ERW对土壤有机碳 (SOC) 的影响,这是最大的陆地碳池,并且在气候变化过程中它的演变仍然不太清楚.
- 了解这些动态对于优化ERW的长期碳捕获至关重要.
研究的目的:
- 调查新鲜和经过气候变化的玄武岩应用对土壤碳流和有机物 (OM) 周转的影响.
- 评估玄武岩气候变化对温带耕地土壤中无机和有机碳动态的不断变化的影响.
主要方法:
- 一个为期6个月的土壤化实验,使用13C标记的草.
- 新鲜 (精细,富含橄素) 和经过气候变化的 (粗/精细,缺乏橄素) 玄武岩在温带耕地表土的应用.
- 监测土壤pH值,溶解无机碳 (DIC),土壤无机碳 (SIC) 积累和SOC损失.
主要成果:
- 新鲜玄武岩增加了土壤pH值,增强了DIC和SIC积累,但造成了显著的SOC损失 (~17%),导致净C损失 (~13%).
- 经过气候变化的玄武岩稳定了土壤pH值,优先考虑了SIC积累,并增强了OC保留,减少了净C损失 (~6%).
- 土壤和废水中超过95%的总C仍然是有机的;草分解与玄武岩溶解相竞争,限制了IC积累.
结论:
- 石对土壤碳的影响很复杂,新鲜的玄武岩由于SOC耗尽而导致净C损失,而经过气候变化的玄武岩提供了更好的C稳定.
- 通过尽量减少损失来维持SOC对于有效的长期碳封存至关重要,与ERW的IC积累一起.
- 玄武岩气候变化的阶段显著改变其对土壤碳动态的影响,强调需要量身定制的应用策略.
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