气候变化领域集成服务门户(CCPortal): Impacts of tillage practices on soil carbon stocks in the US corn-soybean cropping system during 1998 to 2016

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DOI	10.1088/1748-9326/ab6393
	Impacts of tillage practices on soil carbon stocks in the US corn-soybean cropping system during 1998 to 2016
	Yu Z.; Lu C.; Hennessy D.A.; Feng H.; Tian H.
发表日期	2020
ISSN	17489318
卷号	15 期号:1
英文摘要	Tillage alters the thermal and wetness conditions in soil, which facilitates soil organic matter oxidation and water transportation, leading to rapid depletion of soil carbon (C). Little is known about tillage intensity change (TIC) and its impacts in the US corn-soybean rotation system over the past two decades. Using time-series tillage maps developed from a private survey and a process-based land ecosystem model, here we examined how tillage intensity has changed across the nation and affected soil organic carbon (SOC) storage from 1998 to 2016. Results derived from the combination of tillage survey data and cropland distribution maps show that total corn-soybean area consistently increased from 62.3 Mha in 1998 to 66.8 Mha in 2008 and to 73.1 Mha in 2016, among which the acreage under no-till system increased from 16.9 Mha in 1998 to 28.9 Mha in 2008, while conservation and conventional tillage decreased by 3.8 and 3.9 Mha, respectively. The extent of no-till practice in corn-soybean lands shrank by 2.6 Mha from 2008 to 2016, while conservation and conventional tillage increased by 2.8 and 6.1 Mha in the same period. Modeling simulations reveal that historical tillage practices led to a soil C loss of 10.3 (spring till only) to 15.2 (tilled in both spring and fall) Tg C yr-1 in the study area from 1998 to 2016. In addition, reduced tillage intensity in corn-soybean cropland contributed to SOC accumulation at 1.0 Tg C yr-1 (1.6 g C m-2 yr-1) from 1998 to 2008, but the SOC gain was offset by SOC reduction at 2.4 Tg C yr-1 (3.4 g C m-2 yr-1) from increased tillage intensity during the period 2008-2016. For both periods, TIC-induced hydrological C loss accounted for 15% of the SOC change, while the rest was attributed to gaseous-C loss. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	carbon storage; conterminous US; soil erosion; soil organic carbon; tillage
语种	英语
scopus关键词	Digital storage; Organic carbon; Soils; Surveys; Carbon storage; Conventional tillage; Corn-soybean rotations; Soil erosion; Soil organic carbon; Soil organic carbon storages; Soil organic matters; tillage; Agriculture; carbon sequestration; cropping practice; maize; organic carbon; soil carbon; soil erosion; soybean; tillage; United States; Glycine max; Zea mays
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154130
作者单位	School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, 210044, China; Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA 50011, United States; Department of Agricultural, Food and Resource Economics, Michigan State University, East Lansing, MI 48824, United States; International Center for Climate and Global Change Research, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, United States
推荐引用方式 GB/T 7714	Yu Z.,Lu C.,Hennessy D.A.,et al. Impacts of tillage practices on soil carbon stocks in the US corn-soybean cropping system during 1998 to 2016[J],2020,15(1).
APA	Yu Z.,Lu C.,Hennessy D.A.,Feng H.,&Tian H..(2020).Impacts of tillage practices on soil carbon stocks in the US corn-soybean cropping system during 1998 to 2016.Environmental Research Letters,15(1).
MLA	Yu Z.,et al."Impacts of tillage practices on soil carbon stocks in the US corn-soybean cropping system during 1998 to 2016".Environmental Research Letters 15.1(2020).