干旱区生态环境知识资源中心(Arid): Wetting-induced soil CO2 emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert

Arid

DOI	10.1111/gcb.16669
	Wetting-induced soil CO2 emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert
	Andrews, Holly M.; Krichels, Alexander H.; Homyak, Peter M.; Piper, Stephanie; Aronson, Emma L.; Botthoff, Jon; Greene, Aral C.; Jenerette, G. Darrel
通讯作者	Andrews, HM
来源期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
EISSN	1365-2486
出版年	2023
卷号	29 期号:11 页码:3205-3220
英文摘要	Warming-induced changes in precipitation regimes, coupled with anthropogenically enhanced nitrogen (N) deposition, are likely to increase the prevalence, duration, and magnitude of soil respiration pulses following wetting via interactions among temperature and carbon (C) and N availability. Quantifying the importance of these interactive controls on soil respiration is a key challenge as pulses can be large terrestrial sources of atmospheric carbon dioxide (CO2) over comparatively short timescales. Using an automated sensor system, we measured soil CO2 flux dynamics in the Colorado Desert-a system characterized by pronounced transitions from dry-to-wet soil conditions-through a multi-year series of experimental wetting campaigns. Experimental manipulations included combinations of C and N additions across a range of ambient temperatures and across five sites varying in atmospheric N deposition. We found soil CO2 pulses following wetting were highly predictable from peak instantaneous CO2 flux measurements. CO2 pulses consistently increased with temperature, and temperature at time of wetting positively correlated to CO2 pulse magnitude. Experimentally adding N along the N deposition gradient generated contrasting pulse responses: adding N increased CO2 pulses in low N deposition sites, whereas adding N decreased CO2 pulses in high N deposition sites. At a low N deposition site, simultaneous additions of C and N during wetting led to the highest observed soil CO2 fluxes reported globally at 299.5 mu mol CO2 m(-2) s(-1). Our results suggest that soils have the capacity to emit high amounts of CO2 within small timeframes following infrequent wetting, and pulse sizes reflect a non-linear combination of soil resource and temperature interactions. Importantly, the largest soil CO2 emissions occurred when multiple resources were amended simultaneously in historically resource-limited desert soils, pointing to regions experiencing simultaneous effects of desertification and urbanization as key locations in future global C balance.
英文关键词	CO2 flux desert N deposition soil C and N soil wetting temperature
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000958301900001
WOS关键词	PRECIPITATION PULSES ; HOT MOMENTS ; DRYLAND ECOSYSTEMS ; INORGANIC NITROGEN ; ORGANIC-MATTER ; RESPIRATION ; WATER ; DEPOSITION ; SENSITIVITY ; IMMOBILIZATION
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396773
推荐引用方式 GB/T 7714	Andrews, Holly M.,Krichels, Alexander H.,Homyak, Peter M.,et al. Wetting-induced soil CO2 emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert[J],2023,29(11):3205-3220.
APA	Andrews, Holly M..,Krichels, Alexander H..,Homyak, Peter M..,Piper, Stephanie.,Aronson, Emma L..,...&Jenerette, G. Darrel.(2023).Wetting-induced soil CO2 emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert.GLOBAL CHANGE BIOLOGY,29(11),3205-3220.
MLA	Andrews, Holly M.,et al."Wetting-induced soil CO2 emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert".GLOBAL CHANGE BIOLOGY 29.11(2023):3205-3220.