Arid
DOI10.1007/s00442-018-4200-9
A tale of ENSO, PDO, and increasing aridity impacts on drought-deciduous shrubs in the Death Valley region
Ehleringer, James R.1; Sandquist, Darren R.2
通讯作者Ehleringer, James R.
来源期刊OECOLOGIA
ISSN0029-8549
EISSN1432-1939
出版年2018
卷号187期号:4页码:879-895
英文摘要

Germination, establishment, phenology, and death among three drought-deciduous shrubs were influenced by ENSO/PDO and precipitation, based on 37 years of annual surveys. Encelia farinosa forms near monospecific stands on slopes, whereas E. frutescens and Ambrosia salsola dominate wash habitats. All shrubs exhibited phenological coherence. While germination, establishment, and mortality patterns were similar among wash species, these dynamics contrasted with E. farinosa on slopes. Germination was associated with El Nio years. Slope plant establishment was dependent on precipitation in the subsequent year, but not evidently so in wash species. Major mortality events were episodic, with Encelia mortality just as likely to occur in years with below or above average precipitation. In both Encelia species, mortality was associated with transitions to a cold PDO phase. In E. frutescens this response was more rapid, whereas in E. farinosa mortality lagged 1 year, resulting in contrasting slope-wash mortality patterns. 50% of newly established shrubs died within 5, 5, and 18 years for E. frutescens, E. farinosa, and A. salsola, respectively. The 90% mortality ages were 26 years for E. frutescens, 24 years for E. farinosa, and 51 years for A. salsola. While maximum life expectancies are unknown, estimated maximum life expectancies were 56, 66, and 86 years for E. frutescens, E. farinosa, and A. salsola, respectively. Overall, as the climate has become more arid over the past four decades, the populations in both slope and wash habitats have exhibited similar responses: reduced shrub abundances and reduced total supportable leaf areas.


英文关键词Encelia Ambrosia Life expectancy Germination Mojave Desert Climate change
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000438271200002
WOS关键词CARBON-ISOTOPE DISCRIMINATION ; DESERT PERENNIAL PLANTS ; RECENT CLIMATE-CHANGE ; ENCELIA-FARINOSA ; MOJAVE-DESERT ; SONORAN-DESERT ; HYMENOCLEA-SALSOLA ; WATER RELATIONS ; ROOT COMMUNICATION ; VEGETATION CHANGE
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/211875
作者单位1.Univ Utah, Sch Biol Sci, 257 South 1400 East, Salt Lake City, UT 84112 USA;
2.Calif State Univ Fullerton, Dept Biol Sci, North State Coll Blvd, Fullerton, CA 92834 USA
推荐引用方式
GB/T 7714
Ehleringer, James R.,Sandquist, Darren R.. A tale of ENSO, PDO, and increasing aridity impacts on drought-deciduous shrubs in the Death Valley region[J],2018,187(4):879-895.
APA Ehleringer, James R.,&Sandquist, Darren R..(2018).A tale of ENSO, PDO, and increasing aridity impacts on drought-deciduous shrubs in the Death Valley region.OECOLOGIA,187(4),879-895.
MLA Ehleringer, James R.,et al."A tale of ENSO, PDO, and increasing aridity impacts on drought-deciduous shrubs in the Death Valley region".OECOLOGIA 187.4(2018):879-895.
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