干旱区生态环境知识资源中心(Arid): Intrinsic water-use efficiency influences establishment in Encelia farinosa

Arid

DOI	10.1007/s00442-022-05217-5
	Intrinsic water-use efficiency influences establishment in Encelia farinosa
	Ehleringer, James R.; Driscoll, Avery W.
通讯作者	Ehleringer, JR
来源期刊	OECOLOGIA
ISSN	0029-8549
EISSN	1432-1939
出版年	2022
卷号	199 期号:3 页码:563-578
英文摘要	We describe establishment of Encelia farinosa, a drought-deciduous shrub common to the Mojave and Sonoran Deserts, based on annual observations of two populations between 1980 and 2020. Only 11 establishment events of 50 + yearlings (0.02-0.03 individuals m(-2)) occurred during this monitoring period; in 68% of the years fewer than 10 yearlings were established. Yearling survival to adulthood (age 4) ranged from 88 to 5% and was significantly related to cumulative precipitation. Juvenile survival rates were lowest during the current megadrought period. We calculated intrinsic water-use efficiency (iWUE) and observed the widest variations in iWUE values among the youngest plants. Among juveniles, surviving yearlings with the lowest iWUE values exhibited upward ontogenetic shifts in iWUE values, whereas those yearlings with the highest initial iWUE values exhibited little if any change. Juvenile size, higher iWUE values, and greater likelihood of surviving were all positively related with each other over the past several decades. Furthermore, iWUE and photosynthetic capacity were positively related to each other, providing a mechanistic explanation for why increased iWUE values among juveniles could lead to greater survival rates and to larger plants under water-deficit conditions. We posit that there is bi-directional selection for genotypic variations in iWUE values among E. farinosa and that this variation is selected for because of interannual environmental heterogeneity in precipitation and VPD associated with both high- and low-frequency climate cycles. Extreme drought cycles may favor plants with higher iWUE values, whereas more mesic periods may allow for greater persistence of lower iWUE genotypes.
英文关键词	Intrinsic water-use efficiency Arid land dynamics Drought Juvenile establishment Carbon isotope ratio Photosynthesis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000823347200001
WOS关键词	CARBON-ISOTOPE DISCRIMINATION ; LEAF GAS-EXCHANGE ; DESERT SHRUB ; INTRASPECIFIC VARIATION ; PHASEOLUS-VULGARIS ; TRANSPIRATION RATE ; PHOTOSYNTHESIS ; PUBESCENCE ; DROUGHT ; SONORAN
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/2XILL650/393882
推荐引用方式 GB/T 7714	Ehleringer, James R.,Driscoll, Avery W.. Intrinsic water-use efficiency influences establishment in Encelia farinosa[J],2022,199(3):563-578.
APA	Ehleringer, James R.,&Driscoll, Avery W..(2022).Intrinsic water-use efficiency influences establishment in Encelia farinosa.OECOLOGIA,199(3),563-578.
MLA	Ehleringer, James R.,et al."Intrinsic water-use efficiency influences establishment in Encelia farinosa".OECOLOGIA 199.3(2022):563-578.