气候变化领域集成服务门户(CCPortal): Soil N2O emissions after perennial legume termination in an alfalfa-wheat crop rotation system under Mediterranean conditions

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DOI	10.4081/ija.2020.1613
	Soil N2O emissions after perennial legume termination in an alfalfa-wheat crop rotation system under Mediterranean conditions
	Trozzo L.; Francioni M.; Kishimoto-Mo A.W.; Foresi L.; Bianchelli M.; Nora B.; D’Ottavio P.; Toderi M.
发表日期	2020
ISSN	11254718
起始页码	229
结束页码	238
卷号	15 期号:3
英文摘要	Agricultural activities are potential sources of greenhouse gas (GHG) emissions, and nitrous oxide (N2O) is one of the most important non-carbon-dioxide GHGs. Perennial legumes such as alfalfa (Medicago sativa L.) have potential roles for reduction of soil GHG emissions as part of crop rotation systems. However, the implications of perennial legume termination by tillage and subsequent soil incorporation of the residues for reduced GHG emissions have been poorly examined in Mediterranean environments. With the aim to assess the magnitude of soil N2O emissions (important for the definition of mitigation strategies) after perennial legume termination in alfalfa-wheat crop rotation systems in a Mediterranean environment, we defined the hypothesis that alfalfa termination by tillage with incorporation of the crop residues will increase soil N2O emissions during the subsequent wheat season. To test this hypothesis, closed static chambers were used in a field-plot experiment, using a complete randomised block design with three replicates. Soil N2O emissions were monitored across 33 sampling dates from October 2017 to July 2018, as a comparison between an original 6-year-old alfalfa field (‘continuous alfalfa’) and alfalfa termination followed by wheat (‘alfalfa+wheat’). The soil N2O emission fluxes varied markedly across the treatments and throughout the monitoring period (from-0.02±0.01 to 0.53±0.14 g N-N2O ha-1 h-1, and from 0.02±0.07 to 0.37±0.11 g N-N2O ha-1h-1 for continuous alfalfa and alfalfa+wheat, respectively), generally following the changes in soil temperature. Several soil N2O emission peaks were recorded for both treatments, which mainly coincided with rainfall and with increased soil water content. In the 2 months following alfalfa termination, alfalfa+wheat showed higher cumulative weekly soil N2O emissions compared to continuous alfalfa. Following alfalfa termination for alfalfa+wheat, the increased cumulative weekly soil N2O emissions appeared to be due to asynchrony between nitrogen (N) released into the soil from mineralisation of the alfalfa residues and N uptake by the wheat. Despite these initial high soil N2O emissions for alfalfa+wheat, the seasonal cumulative soil N2O emissions were not significantly different (0.77±0.09 vs 0.85±0.18 kg N-N2O ha-1for continuous alfalfa and alfalfa+wheat, respectively). These data suggest that legume perennial crop termination in alfalfa-wheat rotation systems does not lead to significant loss of N2O from the soil. The alfalfa termination by tillage performed in autumn might, on the one hand, have slowed the mineralisation process, and might, on the other hand, have synchronised the N release by the mineralised crop residues, with the N uptake by the wheat reducing the soil N2O emissions. © The Author(s), 2020.
英文关键词	Crop residues; Greenhouse gases; Nitrogen; Soil tillage
scopus关键词	crop residue; crop rotation; farming system; greenhouse gas; herb; human activity; legume; Mediterranean environment; nitrous oxide; reduction; soil emission; soil water; wheat; Desmodium; Medicago sativa; Triticum aestivum
来源期刊	Italian Journal of Agronomy
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177035
作者单位	Department of Agricultural, Food and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy; National Institute for Agro-Environmental Sciences, Tsukuba, Japan; National Institute of Agricultural Botany-East Malling Research, New Road, East Malling, Kent, United Kingdom
推荐引用方式 GB/T 7714	Trozzo L.,Francioni M.,Kishimoto-Mo A.W.,et al. Soil N2O emissions after perennial legume termination in an alfalfa-wheat crop rotation system under Mediterranean conditions[J],2020,15(3).
APA	Trozzo L..,Francioni M..,Kishimoto-Mo A.W..,Foresi L..,Bianchelli M..,...&Toderi M..(2020).Soil N2O emissions after perennial legume termination in an alfalfa-wheat crop rotation system under Mediterranean conditions.Italian Journal of Agronomy,15(3).
MLA	Trozzo L.,et al."Soil N2O emissions after perennial legume termination in an alfalfa-wheat crop rotation system under Mediterranean conditions".Italian Journal of Agronomy 15.3(2020).