气候变化领域集成服务门户(CCPortal): Soil N2O emissions following termination of grass pea and oat cover crop residues with different maturity levels

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DOI	10.1002/jpln.202000239
	Soil N2O emissions following termination of grass pea and oat cover crop residues with different maturity levels
	Singh H.; Kandel T.P.; Gowda P.H.; Northup B.K.; Kakani V.G.; Baath G.S.
发表日期	2020
ISSN	14368730
起始页码	734
结束页码	744
卷号	183 期号:6
英文摘要	Background: Although cover crops provide many agronomic and environmental benefits, they may also increase nitrous oxide (N2O) emissions after termination. The N2O emissions from decomposing biomass of cover crops largely depends on the type of cover and maturity level at termination. Aim: The objective of this study was to quantify N2O emissions following soil incorporation of a non-legume (oat; Avena sativa L.) and a legume (grass pea; Lathyrus sphaericus Retz.) cover crop residues at two different maturity levels. Methods: Oat and grass pea were terminated at vegetative (early-termination) and reproductive (late-termination) stages, and stored fresh before soil incorporation (2.5 Mg dry matter ha−1) together in late-May. A treatment with no cover crop was included as the control. The experiment was laid out as completely randomized block design with three replicated plots (2 m × 2 m) in each treatment combination. Finger millet [Eleusine coracana (L.) Gaertn] seedlings were transplanted as a summer crop. The N2O fluxes were measured with a closed chamber with a portable gas analyzer on 25 dates over an experimental period of 98 days. Results: In general, fluxes of N2O increased after rainfall or irrigation events and approximated zero during dry periods. Cumulative N2O emissions during the 98 days study period were higher (p < 0.01) from all cover crops treatments than the control. Effects of maturity level at termination on cumulative N2O emissions were significant (p < 0.05) as 30–35% higher emissions were recorded from both cover crops terminated at the reproductive stage than the vegetative stage. Yields of finger millet biomass from oat incorporated plots were 15–19% greater (p < 0.05) than grass pea incorporated plots, while the yields from control plots were not significantly different from plots receiving cover crop residues. Conclusions: Stage of maturity at termination alone was not a strong predictor of total cumulative N2O emissions from decomposing cover crop residues, as maturity level interacted with environment variables (e.g., timing of rainfall events). © 2020 Wiley-VCH GmbH
英文关键词	biomass decomposition; C/N ratio; finger millet; N mineralization; nitrous oxide
来源期刊	Journal of Plant Nutrition and Soil Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176733
作者单位	Oklahoma State University, Department of Plant and Soil Sciences, Stillwater, OK 74078, United States; Noble Research Institute, LLC, Ardmore, OK 73401, United States; USDA-ARS Southeast Area, Stoneville, MS 38776, United States; USDA-ARS Grazinglands Research Laboratory, Forage and Livestock Production Research Unit, El Reno, OK 73036, United States
推荐引用方式 GB/T 7714	Singh H.,Kandel T.P.,Gowda P.H.,et al. Soil N2O emissions following termination of grass pea and oat cover crop residues with different maturity levels[J],2020,183(6).
APA	Singh H.,Kandel T.P.,Gowda P.H.,Northup B.K.,Kakani V.G.,&Baath G.S..(2020).Soil N2O emissions following termination of grass pea and oat cover crop residues with different maturity levels.Journal of Plant Nutrition and Soil Science,183(6).
MLA	Singh H.,et al."Soil N2O emissions following termination of grass pea and oat cover crop residues with different maturity levels".Journal of Plant Nutrition and Soil Science 183.6(2020).