干旱区生态环境知识资源中心(Arid): Drought resistance and resilience: The role of soil moisture-plant interactions and legacies in a dryland ecosystem

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DOI	10.1111/1365-2745.13681
	Drought resistance and resilience: The role of soil moisture-plant interactions and legacies in a dryland ecosystem
	Hoover, David L.; Pfennigwerth, Alix A.; Duniway, Michael C.
通讯作者	Hoover, DL (corresponding author), USDA ARS, Rangeland Resources & Syst Res Unit, Crops Res Lab, Ft Collins, CO 80522 USA.
来源期刊	JOURNAL OF ECOLOGY
ISSN	0022-0477
EISSN	1365-2745
出版年	2021
英文摘要	In many regions of the world, climate change is projected to reduce water availability through changes in the hydrological cycle, including more frequent and intense droughts, as well as seasonal shifts in precipitation. In water-limited ecosystems, such as drylands, lower soil water availability may exceed the adaptive capacity of many organisms, leading to cascading ecological effects during (concurrent effects) and after drought (legacy effects). The magnitude and duration of concurrent and legacy effects depends on drought intensity, duration and timing as well as the resistance and resilience of the ecosystem. Here, we investigated the effects of drought seasonality and plant community composition on two dominant perennial grasses, Achnatherum hymenoides (C-3 photosynthesis) and Pleuraphis jamesii (C-4 photosynthesis), in a dryland ecosystem. The experiment consisted of three precipitation treatments: control (ambient precipitation), cool-season drought (-66% ambient precipitation November-April) and warm-season drought (-66% ambient precipitation May-October), applied in two plant communities (perennial grasses with or without a large shrub, Ephedra viridis) over a 3-year period. We examined the concurrent and legacy effects of seasonal drought on soil moisture, phenology and biomass. Drought treatments had strong concurrent and legacy effects on soil moisture, which impacted the phenology and biomass of the two grasses. Drought reduced growing season length by delaying green-up (cool-season drought) or advancing senescence (warm-season drought) and reduced biomass for both species. Biomass and phenology legacy effects from drought emerged in the second and third years of the experiment. While we observed differential sensitivity to drought legacies between the two grasses, we found limited evidence that shrub presence had interactive effects with the drought treatment. Synthesis. The results from this study highlight how abiotic and biotic legacies can develop and influence a community's resistance and resilience to subsequent droughts. When the frequency of repeated extreme events, such as recurring seasonal droughts, exceeds the capacity of organisms or ecosystems to recover (i.e. resilience), persistent drought legacies can reduce the resistance to subsequent drought events. Overall, these results highlight how drought legacies are a product of ecological resistance and resilience to past drought and can influence ecosystem vulnerability to future droughts.
英文关键词	biomass Colorado Plateau phenology resilience resistance seasonal drought soil moisture
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000654036600001
WOS关键词	GRASSLAND RESPONSES ; ECOLOGICAL MEMORY ; PULSE DYNAMICS ; NORTH-AMERICA ; WATER CONTENT ; PRECIPITATION ; DESERT ; CLIMATE ; PRODUCTIVITY ; COMPETITION
WOS类目	Plant Sciences ; Ecology
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/352318
作者单位	[Hoover, David L.] USDA ARS, Rangeland Resources & Syst Res Unit, Crops Res Lab, Ft Collins, CO 80522 USA; [Pfennigwerth, Alix A.; Duniway, Michael C.] US Geol Survey, Southwest Biol Sci Ctr, Moab, UT USA
推荐引用方式 GB/T 7714	Hoover, David L.,Pfennigwerth, Alix A.,Duniway, Michael C.. Drought resistance and resilience: The role of soil moisture-plant interactions and legacies in a dryland ecosystem[J]. United States Geological Survey,2021.
APA	Hoover, David L.,Pfennigwerth, Alix A.,&Duniway, Michael C..(2021).Drought resistance and resilience: The role of soil moisture-plant interactions and legacies in a dryland ecosystem.JOURNAL OF ECOLOGY.
MLA	Hoover, David L.,et al."Drought resistance and resilience: The role of soil moisture-plant interactions and legacies in a dryland ecosystem".JOURNAL OF ECOLOGY (2021).