气候变化领域集成服务门户(CCPortal): Deep-C storage: Biological, chemical and physical strategies to enhance carbon stocks in agricultural subsoils

CCPortal

DOI	10.1016/j.soilbio.2022.108697
	Deep-C storage: Biological, chemical and physical strategies to enhance carbon stocks in agricultural subsoils
	Button, Erik S.; Pett-Ridge, Jennifer; Murphy, Daniel, V; Kuzyakov, Yakov; Chadwick, David R.; Jones, Davey L.
发表日期	2022
ISSN	0038-0717
EISSN	1879-3428
卷号	170
英文摘要	Due to their substantial volume, subsoils contain more of the total soil carbon (C) pool than topsoils. Much of this C is thousands of years old, suggesting that subsoils offer considerable potential for long-term C sequestration. However, knowledge of subsoil C behaviour and manageability remains incomplete, and subsoil C storage potential has yet to be realised at a large scale, particularly in agricultural systems. A range of biological (e.g. deep-rooting), chemical (e.g. biochar burial) and physical (e.g. deep ploughing) C sequestration strategies have been proposed, but are yet to be assessed. In this review, we identify the main factors that regulate subsoil C cycling and critically evaluate the evidence and mechanistic basis of subsoil strategies designed to promote greater C storage, with particular emphasis on agroecosystems. We assess the barriers and opportunities for the implementation of strategies to enhance subsoil C sequestration and identify 5 key current gaps in scientific understanding. We conclude that subsoils, while highly heterogeneous, are in many cases more suited to long-term C sequestration than topsoils. The proposed strategies may also bring other tangible benefits to cropping systems (e.g. enhanced water holding capacity and nutrient use efficiency). Furthermore, while the subsoil C sequestration strategies we reviewed have large potential, more long-term studies are needed across a diverse range of soils and climates, in conjunction with chronosequence and space-for-time substitutions. Also, it is vital that subsoils are more consistently included in modelled estimations of soil C stocks and C sequestration potential, and that subsoil-explicit C models are developed to specifically reflect subsoil processes. Finally, further mapping of subsoil C is needed in specific regions (e.g. in the Middle East, Eastern Europe, South and Central America, South Asia and Africa). Conducting both immediate and long-term subsoil C studies will fill the knowledge gaps to devise appropriate soil C sequestration strategies and policies to help in the global fight against climate change and decline in soil quality. In conclusion, our evidence-based analysis reveals that subsoils offer an untapped potential to enhance global C storage in terrestrial ecosystems.
英文关键词	Chemical stabilization; Greenhouse gas emissions; Organic matter priming; Physical protection; Regenerative agriculture; Subsoil carbon
语种	英语
WOS研究方向	Soil Science
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000848016600001
来源期刊	SOIL BIOLOGY & BIOCHEMISTRY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/280657
作者单位	Bangor University; United States Department of Energy (DOE); Lawrence Livermore National Laboratory; University of California System; University of California Merced; Murdoch University; University of Gottingen; Peoples Friendship University of Russia
推荐引用方式 GB/T 7714	Button, Erik S.,Pett-Ridge, Jennifer,Murphy, Daniel, V,et al. Deep-C storage: Biological, chemical and physical strategies to enhance carbon stocks in agricultural subsoils[J],2022,170.
APA	Button, Erik S.,Pett-Ridge, Jennifer,Murphy, Daniel, V,Kuzyakov, Yakov,Chadwick, David R.,&Jones, Davey L..(2022).Deep-C storage: Biological, chemical and physical strategies to enhance carbon stocks in agricultural subsoils.SOIL BIOLOGY & BIOCHEMISTRY,170.
MLA	Button, Erik S.,et al."Deep-C storage: Biological, chemical and physical strategies to enhance carbon stocks in agricultural subsoils".SOIL BIOLOGY & BIOCHEMISTRY 170(2022).