干旱区生态环境知识资源中心(Arid): Compound hydroclimatic extremes in a semi-arid grassland: Drought, deluge, and the carbon cycle

Arid

DOI	10.1111/gcb.16081
	Compound hydroclimatic extremes in a semi-arid grassland: Drought, deluge, and the carbon cycle
	Hoover, David L.; Hajek, Olivia L.; Smith, Melinda D.; Wilkins, Kate; Slette, Ingrid J.; Knapp, Alan K.
通讯作者	Hoover, DL (corresponding author)，Crops Res Lab, USDA ARS Rangeland Resources & Syst Res Unit, Ft Collins, CO 80526 USA.
来源期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
EISSN	1365-2486
出版年	2022-01
英文摘要	Climate change is predicted to increase the frequency and intensity of extreme events including droughts and large precipitation events or deluges. While many studies have focused on the ecological impacts of individual events (e.g., a heat wave), there is growing recognition that when extreme events co-occur as compound extremes, (e.g., a heatwave during a drought), the additive effects on ecosystems are often greater than either extreme alone. In this study, we assessed a unique type of extreme-a contrasting compound extreme-where the extremes may have offsetting, rather than additive ecological effects, by examining how a deluge during a drought impacts productivity and carbon cycling in a semi-arid grassland. The experiment consisted of four treatments: a control (average precipitation), an extreme drought (<5th percentile), an extreme drought interrupted by a single deluge (>95th percentile), or an extreme drought interrupted by the equivalent amount of precipitation added in several smaller events. We highlight three key results. First, extreme drought resulted in early senescence, reduced carbon uptake, and a decline in net primary productivity relative to the control treatment. Second, the deluge imposed during extreme drought stimulated carbon fluxes and plant growth well above the levels of both the control and the drought treatment with several additional smaller rainfall events, emphasizing the importance of precipitation amount, event size, and timing. Third, while the deluge's positive effects on carbon fluxes and plant growth persisted for 1 month, the deluge did not completely offset the negative effects of extreme drought on end-of-season productivity. Thus, in the case of these contrasting hydroclimatic extremes, a deluge during a drought can stimulate temporally dynamic ecosystem processes (e.g., net ecosystem exchange) while only partially compensating for reductions in ecosystem functions over longer time scales (e.g., aboveground net primary productivity).
英文关键词	carbon flux climate extremes extreme precipitation grassland primary productivity
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000746489700001
WOS关键词	GREAT-PLAINS GRASSLANDS ; PRECIPITATION PULSES ; SOIL-WATER ; PRIMARY PRODUCTIVITY ; CLIMATE-CHANGE ; UNITED-STATES ; DRY REGIONS ; R PACKAGE ; VARIABILITY ; INCREASES
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/2XILL650/377087
作者单位	[Hoover, David L.] Crops Res Lab, USDA ARS Rangeland Resources & Syst Res Unit, Ft Collins, CO 80526 USA; [Hajek, Olivia L.; Smith, Melinda D.; Wilkins, Kate; Slette, Ingrid J.; Knapp, Alan K.] Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA; [Hajek, Olivia L.; Smith, Melinda D.; Wilkins, Kate; Slette, Ingrid J.; Knapp, Alan K.] Colorado State Univ, Grad Degree Program Ecol, Ft Collins, CO 80523 USA
推荐引用方式 GB/T 7714	Hoover, David L.,Hajek, Olivia L.,Smith, Melinda D.,et al. Compound hydroclimatic extremes in a semi-arid grassland: Drought, deluge, and the carbon cycle[J],2022.
APA	Hoover, David L.,Hajek, Olivia L.,Smith, Melinda D.,Wilkins, Kate,Slette, Ingrid J.,&Knapp, Alan K..(2022).Compound hydroclimatic extremes in a semi-arid grassland: Drought, deluge, and the carbon cycle.GLOBAL CHANGE BIOLOGY.
MLA	Hoover, David L.,et al."Compound hydroclimatic extremes in a semi-arid grassland: Drought, deluge, and the carbon cycle".GLOBAL CHANGE BIOLOGY (2022).