气候变化领域集成服务门户(CCPortal): The Pulses of Soil CO2 Emission in Response to Rainfall Events in Central Siberia: Revisiting the Overall Frost-Free Season CO2 Flux

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DOI	10.3390/f15020355
	The Pulses of Soil CO2 Emission in Response to Rainfall Events in Central Siberia: Revisiting the Overall Frost-Free Season CO2 Flux
	Makhnykina, Anastasia V.; Vaganov, Eugene A.; Panov, Alexey V.; Koshurnikova, Nataly N.; Prokushkin, Anatoly S.
发表日期	2024
EISSN	1999-4907
起始页码	15
结束页码	2
卷号	15 期号:2
英文摘要	Boreal forests nowadays act as a sink for atmospheric carbon dioxide; however, their sequestration capacity is highly sensitive to weather conditions and, specifically to ongoing climate warming. Extreme weather events such as heavy rainfalls or, conversely, heat waves during the growing season might perturb the ecosystem carbon balance and convert them to an additional CO2 source. Thus, there is an urgent need to revise ecosystem carbon fluxes in vast Siberian taiga ecosystems as influenced by extreme weather events. In this study, we focused on the soil CO2 pulses appearing after the rainfall events and quantification of their input to the seasonal cumulative CO2 efflux in the boreal forests in Central Siberia. Seasonal measurements of soil CO2 fluxes (both soil respiration and net soil exchange) were conducted during three consecutive frost-free seasons using the dynamic chamber method. Seasonal dynamics of net soil exchange fluxes demonstrated positive values, reflecting that soil respiration rates exceeded CO2 uptake in the forest floor vegetation layer. Moreover, the heavy rains caused a rapid pulse of soil emissions and, as a consequence, the release of additional amounts of CO2 from the soil into the atmosphere. A single rain event may cause a 5-11-fold increase of the NSE flux compared to the pre-rainfall values. The input of CO2 pulses to the seasonal cumulative efflux varied from near zero to 39% depending on precipitation patterns of a particular season. These findings emphasize the critical need for more frequent measurements of soil CO2 fluxes throughout the growing season which capture the CO2 pulses induced by rain events. This approach has inevitable importance for the accurate assessment of seasonal CO2 soil emissions and adequate predictions of response of boreal pine forests to climatic changes.
英文关键词	soil emissions; net soil exchange; boreal forest; precipitation; soil temperature; soil moisture; lichen; CO2 fluxes; Siberia
语种	英语
WOS研究方向	Forestry
WOS类目	Forestry
WOS记录号	WOS:001175211400001
来源期刊	FORESTS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303069
作者单位	Russian Academy of Sciences; Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences; Sukachev Institute of Forest, Siberian Branch, Russian Academy of Sciences; Siberian Federal University
推荐引用方式 GB/T 7714	Makhnykina, Anastasia V.,Vaganov, Eugene A.,Panov, Alexey V.,et al. The Pulses of Soil CO2 Emission in Response to Rainfall Events in Central Siberia: Revisiting the Overall Frost-Free Season CO2 Flux[J],2024,15(2).
APA	Makhnykina, Anastasia V.,Vaganov, Eugene A.,Panov, Alexey V.,Koshurnikova, Nataly N.,&Prokushkin, Anatoly S..(2024).The Pulses of Soil CO2 Emission in Response to Rainfall Events in Central Siberia: Revisiting the Overall Frost-Free Season CO2 Flux.FORESTS,15(2).
MLA	Makhnykina, Anastasia V.,et al."The Pulses of Soil CO2 Emission in Response to Rainfall Events in Central Siberia: Revisiting the Overall Frost-Free Season CO2 Flux".FORESTS 15.2(2024).