Tillage effects on growing season nitrous oxide emissions in Canadian cropland soils

IF 1.5 4区 农林科学 Q4 SOIL SCIENCE
D. Pelster, Jean-Pascal Matteau, Richard E Farrell, Guillermo Hernandez-Ramirez
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引用次数: 0

Abstract

Minimizing tillage has been promoted as an agricultural practice that may mitigate greenhouse gas emissions through carbon sequestration. However, there is some ambiguity regarding the effect of minimum tillage (MT) on emissions of other greenhouse gases, in particular soil nitrous oxide (N2O) emissions. To determine how effective MT could be in helping Canada mitigate greenhouse gas emissions, we used a meta-analysis to compare growing season N2O emissions from MT versus conventional tillage (CT). Overall, MT had 12% lower N2O emissions compared to CT (P = 0.03). However, there was high variability due to soil texture and growing season precipitation, with MT tending to emit more N2O than CT in climates where growing season precipitation exceeded 600 mm; particularly for soils with sand content less than 60%. Therefore, unless long-term tillage trials, which are urgently needed in eastern Canada, show a reduction in N2O emissions over time, MT should be used as a greenhouse gas mitigation measure only in dry climates or on sandy soils.
耕作对加拿大农田土壤生长季氧化亚氮排放的影响
减少耕作已被推广为一种农业实践,可以通过碳固存来减少温室气体排放。然而,关于最少耕作(MT)对其他温室气体排放的影响,特别是对土壤一氧化二氮(N2O)排放的影响,还存在一些不明确的地方。为了确定MT在帮助加拿大减少温室气体排放方面的有效性,我们使用了一项荟萃分析来比较MT与传统耕作(CT)的生长季节N2O排放量。总体而言,MT的N2O排放量比CT低12% (P = 0.03)。然而,由于土壤质地和生长季降水的影响,N2O在生长季降水超过600 mm的气候条件下,MT倾向于比CT释放更多的N2O;尤其适用于含砂量小于60%的土壤。因此,除非加拿大东部迫切需要的长期耕作试验显示一氧化二氮排放量随着时间的推移而减少,否则MT应仅在干燥气候或沙质土壤中用作温室气体缓解措施。
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来源期刊
Canadian Journal of Soil Science
Canadian Journal of Soil Science 农林科学-土壤科学
CiteScore
2.90
自引率
11.80%
发文量
73
审稿时长
6.0 months
期刊介绍: The Canadian Journal of Soil Science is an international peer-reviewed journal published in cooperation with the Canadian Society of Soil Science. The journal publishes original research on the use, management, structure and development of soils and draws from the disciplines of soil science, agrometeorology, ecology, agricultural engineering, environmental science, hydrology, forestry, geology, geography and climatology. Research is published in a number of topic sections including: agrometeorology; ecology, biological processes and plant interactions; composition and chemical processes; physical processes and interfaces; genesis, landscape processes and relationships; contamination and environmental stewardship; and management for agricultural, forestry and urban uses.
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