气候变化领域集成服务门户(CCPortal): Constraints on mineral-associated and particulate organic carbon response to regenerative management: carbon inputs and saturation deficit

CCPortal

DOI	10.1016/j.still.2024.106008
	Constraints on mineral-associated and particulate organic carbon response to regenerative management: carbon inputs and saturation deficit
	King, Alison E.; Amsili, Joseph P.; Cordova, S. Carolina; Culman, Steve; Fonte, Steven J.; Kotcon, James; Masters, Michael D.; Mcvay, Kent; Olk, Daniel C.; Prairie, Aaron M.; Schipanski, Meagan; Schneider, Sharon K.; Stewart, Catherine E.; Cotrufo, M. Francesca
发表日期	2024
ISSN	0167-1987
EISSN	1879-3444
起始页码	238
卷号	238
英文摘要	Regenerative management has potential to increase soil organic carbon (SOC), which will be crucial for mitigating climate change and improving soil health. Distinct fractions of SOC, particulate organic carbon (POC) and mineral-associated organic carbon (MAOC), have been posited as having contrasting responses to regenerative management. The POC response has been proposed as a leading indicator of total SOC response, whereas MAOC response has been seen as eventually limiting SOC response due to its saturation behavior. We explored these and linked expectations of SOC, POC and MAOC response by leveraging multiple datasets of regenerative management with cover crops or perennial crops as contrasted with conventional management (n = 42 sites). Across sites, POC as a percentage of SOC was on average 19%. Regenerative management increased both POC and MAOC but increases in POC were smaller and narrower (0.78 +/- 0.26 g C kg soil(-1)) than increases in MAOC (1.41 +/- 0.80 g C kg soil(-1)). Changes in POC were only weakly correlated with changes in SOC (p < 0.001 but R-2 = 0.11), revealing that absolute changes in POC at any timepoint should not be taken as indicative of total SOC responses. The MAOC response made up the majority of SOC response at 58% of sites. Changes in POC and MAOC with regenerative management were also not related (p = 0.72), indicating that comprehensive assessment of POC and MAOC is needed to understand SOC accumulation under regenerative management. Increases in POC were explained by annual average of increase in root C inputs with regenerative management, suggesting a limited ability for the current portfolio of regenerative management practices to increase POC, even when implemented over decadal timescales. In contrast, increases in MAOC were partially explained by cumulative-for-the-trial increases in root C inputs and were not clearly constrained by silt + clay-estimated saturation deficit. Our results indicate that the increase of MAOC storage in agricultural soils is not limited by saturation but rather by the extent to which root C inputs can be augmented, and that increasing POC storage will require novel practices to overcome current limitations on POC accumulation.
英文关键词	Soil organic carbon; Particulate organic carbon; Mineral -associated organic carbon; Regenerative management; Cover crops; Saturation
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:001174060000001
来源期刊	SOIL & TILLAGE RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305589
作者单位	Colorado State University; Cornell University; Michigan State University; Washington State University; West Virginia University; University of Illinois System; University of Illinois Urbana-Champaign; Montana State University System; Montana State University Bozeman; United States Department of Agriculture (USDA); United States Department of Agriculture (USDA); United States Department of Agriculture (USDA)
推荐引用方式 GB/T 7714	King, Alison E.,Amsili, Joseph P.,Cordova, S. Carolina,et al. Constraints on mineral-associated and particulate organic carbon response to regenerative management: carbon inputs and saturation deficit[J],2024,238.
APA	King, Alison E..,Amsili, Joseph P..,Cordova, S. Carolina.,Culman, Steve.,Fonte, Steven J..,...&Cotrufo, M. Francesca.(2024).Constraints on mineral-associated and particulate organic carbon response to regenerative management: carbon inputs and saturation deficit.SOIL & TILLAGE RESEARCH,238.
MLA	King, Alison E.,et al."Constraints on mineral-associated and particulate organic carbon response to regenerative management: carbon inputs and saturation deficit".SOIL & TILLAGE RESEARCH 238(2024).