Effectiveness of soil management strategies for mitigation of N2O emissions in European arable land: A meta-analysis

IF 4 2区 农林科学 Q2 SOIL SCIENCE European Journal of Soil Science Pub Date : 2024-05-28 DOI:10.1111/ejss.13488
Elena Valkama, Domna Tzemi, Ulises Ramon Esparza-Robles, Alina Syp, Adam O'Toole, Peter Maenhout
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Abstract

Soil management strategies involving the application of organic matter (OM) inputs (crop residues, green and livestock manure, slurry, digestate, compost and biochar) can increase soil carbon storage but simultaneously lead to an increase in non-CO2 greenhouse gas (GHG) emissions such as N2O. Although multiple meta-analyses have been conducted on the topic of OM input impacts on GHG, none has focused specifically on European arable soils. This study plugs this gap and can assist policymakers in steering European agriculture in a more sustainable direction. The objective of this meta-analysis was to quantify how OM inputs of different nature and quality, but also the application strategy, can mitigate soil N2O emissions in different pedoclimatic conditions in Europe. We quantitatively synthesised the results of over 50 field experiments conducted in 15 European countries. Diverse arable crops, mainly cereals, were cultivated in monoculture or in crop rotations on mineral soils. Cumulative N2O emissions were monitored during periods of 30–1070 days in treatments, which received OM inputs, alone or in combination with mineral N fertiliser; and in controls fertilised with mineral N. The overall effect of OM inputs had a slight tendency to reduce N2O emissions by 10% (n = 53). With the increasing carbon-to-nitrogen ratio of the OM inputs, this mitigation effect became more pronounced. In particular, compost and biochar significantly reduced N2O emissions by 25% (n = 6) and 33% (n = 8) respectively. However, their effect strongly depended on pedoclimatic characteristics. Regarding the other types of OM inputs studied, a slight N2O emission reduction can be achieved by their application alone, without mineral N fertiliser (by 16%, n = 17). In contrast, their co-application with mineral N fertiliser elevated emissions to some extent compared to the control (by 14%, n = 22). We conclude that amongst the seven OM inputs studied, the application of compost and biochar are the most promising soil management practices, clearly demonstrating N2O emission reduction compared to mineral N fertiliser. In contrast, other OM inputs had a small tendency to mitigate N2O emissions only when applied without mineral N fertiliser.

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缓解欧洲耕地一氧化二氮排放的土壤管理策略的有效性:荟萃分析
施用有机物(OM)投入(作物秸秆、绿肥和牲畜粪便、泥浆、沼渣、堆肥和生物炭)的土壤管理策略可以增加土壤碳储量,但同时也会导致非二氧化碳温室气体(GHG)排放量(如一氧化二氮)的增加。虽然已有多项关于 OM 投入对温室气体影响的荟萃分析,但没有一项分析是专门针对欧洲耕地土壤的。本研究填补了这一空白,有助于决策者引导欧洲农业朝着更可持续的方向发展。这项荟萃分析的目的是量化不同性质和质量的有机质投入以及施用策略如何在欧洲不同的气候条件下减少土壤中的一氧化二氮排放。我们定量综合了在 15 个欧洲国家进行的 50 多项田间试验的结果。在矿质土壤上以单作或轮作的方式种植了多种耕地作物(主要是谷物)。在 30-1070 天的时间里,对单独或与矿物氮肥一起施用 OM 的处理以及施用矿物氮肥的对照组进行了一氧化二氮累积排放监测。随着 OM 投入的碳氮比增加,这种减排效果变得更加明显。其中,堆肥和生物炭分别显著减少了 25% (n = 6)和 33% (n = 8)的一氧化二氮排放量。不过,它们的效果在很大程度上取决于气候特征。至于所研究的其他类型的 OM 投入,在不施用矿物氮肥的情况下,单独施用可实现轻微的 N2O 排放减少(16%,n = 17)。相反,与对照组相比,与矿物氮肥同时施用会在一定程度上增加排放量(14%,n = 22)。我们的结论是,在所研究的七种 OM 投入中,堆肥和生物炭的施用是最有前景的土壤管理方法,与矿物氮肥相比,能明显减少一氧化二氮的排放。相比之下,只有在不施用矿物氮肥的情况下,其他有机质投入才有减少一氧化二氮排放的小趋势。
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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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