干旱区生态环境知识资源中心(Arid): Shrub persistence and increased grass mortality in response to drought in dryland systems

Arid

DOI	10.1111/gcb.14667
	Shrub persistence and increased grass mortality in response to drought in dryland systems
	Winkler, Daniel E.1; Belnap, Jayne1 ; Hoover, David 2; Reed, Sasha C.1; Duniway, Michael C.1
通讯作者	Winkler, Daniel E.
来源期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
EISSN	1365-2486
出版年	2019
卷号	25 期号:9 页码:3121-3135
英文摘要	Droughts in the southwest United States have led to major forest and grassland die-off events in recent decades, suggesting plant community and ecosystem shifts are imminent as native perennial grass populations are replaced by shrub- and invasive plant-dominated systems. These patterns are similar to those observed in arid and semiarid systems around the globe, but our ability to predict which species will experience increased drought-induced mortality in response to climate change remains limited. We investigated meteorological drought-induced mortality of nine dominant plant species in the Colorado Plateau Desert by experimentally imposing a year-round 35% precipitation reduction for eight continuous years. We distributed experimental plots across numerous plant, soil, and parent material types, resulting in 40 distinct sites across a 4,500 km(2) region of the Colorado Plateau Desert. For all 8 years, we tracked c. 400 individual plants and evaluated mortality responses to treatments within and across species, and through time. We also examined the influence of abiotic and biotic site factors in driving mortality responses. Overall, high mortality trends were driven by dominant grass species, including Achnatherum hymenoides, Pleuraphis jamesii, and Sporobolus cryptandrus. Responses varied widely from year to year and dominant shrub species were generally resistant to meteorological drought, likely due to their ability to access deeper soil water. Importantly, mortality increased in the presence of invasive species regardless of treatment, and native plant die-off occurred even under ambient conditions, suggesting that recent climate changes are already negatively impacting dominant species in these systems. Results from this long-term drought experiment suggest major shifts in community composition and, as a result, ecosystem function. Patterns also show that, across multiple soil and plant community types, native perennial grass species may be replaced by shrubs and invasive annuals in the Colorado Plateau Desert.
英文关键词	Bromus tectorum cheatgrass climate change graminoids grass parent material perennials populations Salsola shrubs
类型	Article
语种	英语
国家	USA
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000478644100021
WOS关键词	WOODY PLANT MORTALITY ; COLORADO PLATEAU ; TREE MORTALITY ; CLIMATE-CHANGE ; LAND-USE ; DIE-OFF ; ECOLOGICAL RESTORATION ; VEGETATION CHANGE ; MODEL SELECTION ; ROOTING DEPTH
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; 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/2XILL650/216089
作者单位	1.US Geol Survey, Southwest Biol Sci Ctr, Moab, UT 84532 USA; 2.ARS, Rangeland Resources & Syst Res Unit, USDA, Ft Collins, CO USA
推荐引用方式 GB/T 7714	Winkler, Daniel E.,Belnap, Jayne,Hoover, David,et al. Shrub persistence and increased grass mortality in response to drought in dryland systems[J]. United States Geological Survey,2019,25(9):3121-3135.
APA	Winkler, Daniel E.,Belnap, Jayne,Hoover, David,Reed, Sasha C.,&Duniway, Michael C..(2019).Shrub persistence and increased grass mortality in response to drought in dryland systems.GLOBAL CHANGE BIOLOGY,25(9),3121-3135.
MLA	Winkler, Daniel E.,et al."Shrub persistence and increased grass mortality in response to drought in dryland systems".GLOBAL CHANGE BIOLOGY 25.9(2019):3121-3135.