气候变化领域集成服务门户(CCPortal): Effects of soil water content at freezing, thaw temperature, and snowmelt infiltration on N2O emissions and denitrifier gene and transcript abundance during a single freeze-thaw event

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DOI	10.1007/s00374-024-01817-w
	Effects of soil water content at freezing, thaw temperature, and snowmelt infiltration on N2O emissions and denitrifier gene and transcript abundance during a single freeze-thaw event
	Sennett, Louise B.; Brin, Lindsay D.; Goyer, Claudia; Zebarth, Bernie J.; Burton, David L.
发表日期	2024
ISSN	0178-2762
EISSN	1432-0789
起始页码	60
结束页码	4
卷号	60 期号:4
英文摘要	Climate change-related warming and increased precipitation may alter winter snow cover and thawing events, and therefore, may carry significant consequences for nitrous oxide (N2O) production pathways such as denitrification, and the abundance and expression of denitrifying microorganisms. We used a soil microcosm study to investigate the combined effect of soil thaw temperature, initial water filled pore space (WFPS) prior to soil freezing, and snowmelt infiltration simulated by the addition of water on N2O emission and denitrification rates, soil respiration rate, and the abundance and transcription of denitrifying (nirK, nirS, and nosZ) bacteria during a single freeze-thaw event. Soil respiration rate was primarily controlled by an increase in soil thaw temperature, whereas soil N2O emission and denitrification rates were generally greater in soils with a higher initial WFPS and soil thaw temperature. In contrast, snowmelt infiltration generally had a negligible effect on these rates, which may be related to pre-existing soil conditions that were already conducive to denitrification. Unexpectedly, the nosZ transcript/nosZ gene abundance ratio was lower in soils thawed at 8.0 degrees C compared to 1.5 degrees C; however, this may have resulted in a lower N2O reduction, thus explaining the greater levels of N2O emitted from soils thawed at 8.0 degrees C. Overall, this study demonstrated that increased N2O production during a single freeze-thaw event was primarily linked to antecedent conditions of high initial WFPS, soil thaw temperature, and a synergistic interplay between these two environmental parameters, and provides evidence that an increase in annual temperature and precipitation, along with the timing of precipitation, may further stimulate N2O production pathways.
英文关键词	Water-filled pore space; Soil microcosms; Nitrous oxide; Denitrifier abundance; Denitrifier transcription
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:001200723900002
来源期刊	BIOLOGY AND FERTILITY OF SOILS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303560
作者单位	Agriculture & Agri Food Canada; Dalhousie University; Norwegian University of Life Sciences
推荐引用方式 GB/T 7714	Sennett, Louise B.,Brin, Lindsay D.,Goyer, Claudia,et al. Effects of soil water content at freezing, thaw temperature, and snowmelt infiltration on N2O emissions and denitrifier gene and transcript abundance during a single freeze-thaw event[J],2024,60(4).
APA	Sennett, Louise B.,Brin, Lindsay D.,Goyer, Claudia,Zebarth, Bernie J.,&Burton, David L..(2024).Effects of soil water content at freezing, thaw temperature, and snowmelt infiltration on N2O emissions and denitrifier gene and transcript abundance during a single freeze-thaw event.BIOLOGY AND FERTILITY OF SOILS,60(4).
MLA	Sennett, Louise B.,et al."Effects of soil water content at freezing, thaw temperature, and snowmelt infiltration on N2O emissions and denitrifier gene and transcript abundance during a single freeze-thaw event".BIOLOGY AND FERTILITY OF SOILS 60.4(2024).