气候变化领域集成服务门户(CCPortal): Photosynthetic limits on carbon sequestration in croplands

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DOI	10.1016/j.geoderma.2022.115810
	Photosynthetic limits on carbon sequestration in croplands
	Janzen, Henry; van Groenigen, Kees Jan; Powlson, David S.; Schwinghamer, Timothy; van Groenigen, Jan Willem
发表日期	2022
ISSN	0016-7061
EISSN	1872-6259
卷号	416
英文摘要	How much C can be stored in agricultural soils worldwide to mitigate rising carbon dioxide (CO2) concentrations, and at what cost? This question, because of its critical relevance to climate policy, has been a focus of soil science for decades. The amount of additional soil organic C (SOC) that could be stored has been estimated in various ways, most of which have taken the soil as the starting point: projecting how much of the SOC previously lost can be restored, for example, or calculating the cumulative effect of multiple soil management strategies. Here, we take a different approach, recognizing that photosynthesis, the source of C input to soil, represents the most fundamental constraint to C sequestration. We follow a simple Fermi approach to derive a rough but robust estimate by reducing our problem to a series of approximate relations that can be parameterized using data from the literature. We distinguish two forms of soil C: 'ephemeral C', denoting recently-applied plant-derived C that is quickly decayed to CO2, and 'lingering C,' which remains in the soil long enough to serve as a lasting repository for C derived from atmospheric CO2. First, we estimate global net C inputs into lingering SOC in croplands from net primary production, biomass removal by humans and short-term decomposition. Next, we estimate net additional C storage in cropland soils globally from the estimated C inputs, accounting also for decomposition of lingering SOC already present. Our results suggest a maximum C input rate into the lingering SOC pool of 0.44 Pg C yr(-1), and a maximum net sequestration rate of 0.14 Pg C yr(-1) - significantly less than most previous estimates, even allowing for acknowledged uncertainties. More importantly, we argue for a re-orientation in emphasis from soil processes towards a wider ecosystem perspective, starting with photosynthesis.
英文关键词	Carbon sequestration; Photosynthesis; Croplands; Decomposition
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:000795905200004
来源期刊	GEODERMA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/280856
作者单位	Agriculture & Agri Food Canada; University of Exeter; UK Research & Innovation (UKRI); Biotechnology and Biological Sciences Research Council (BBSRC); Rothamsted Research; Wageningen University & Research
推荐引用方式 GB/T 7714	Janzen, Henry,van Groenigen, Kees Jan,Powlson, David S.,et al. Photosynthetic limits on carbon sequestration in croplands[J],2022,416.
APA	Janzen, Henry,van Groenigen, Kees Jan,Powlson, David S.,Schwinghamer, Timothy,&van Groenigen, Jan Willem.(2022).Photosynthetic limits on carbon sequestration in croplands.GEODERMA,416.
MLA	Janzen, Henry,et al."Photosynthetic limits on carbon sequestration in croplands".GEODERMA 416(2022).