干旱区生态环境知识资源中心(Arid): Changes in structure and physiological functioning due to experimentally enhanced precipitation seasonality in a widespread shrub species

Arid

DOI	10.1007/s11258-018-0845-z
	Changes in structure and physiological functioning due to experimentally enhanced precipitation seasonality in a widespread shrub species
	Reinhardt, Keith 1; McAbee, Kathryn 1; Germino, Matthew J.2
通讯作者	Reinhardt, Keith
来源期刊	PLANT ECOLOGY
ISSN	1385-0237
EISSN	1573-5052
出版年	2019
卷号	220 期号:2 页码:199-211
英文摘要	Semi-arid shrub steppe occupies a vast geographic range that is characterized in part by distinct seasonal patterns in precipitation. Few studies have evaluated how variability in both the amount and timing of precipitation affect the structure and physiology of shrubs in these systems. We quantified changes in foliar crown parameters, xylem anatomy, gas exchange, and hydraulic transport capacity in deep-rooted Artemisia tridentata shrubs following 20years of experimental manipulations in amount and seasonal timing of precipitation. We hypothesized that shrub growth (total leaf area per shrub and cover of shrub community), hydraulic transport efficiency, and gas exchange would increase in shrubs in irrigated plots compared to non-irrigated control plots, especially for irrigation applied in winter rather than summer. We also predicted similar changes in xylem anatomy (ring width, vessel size and frequency). Most treatment responses entailed changes in plant structure, and were generally consistent with our hypotheses: total-shrub leaf area, shrub basal area, canopy cover, and maximum sapwood-specific branch hydraulic conductivity were more than 2x greater in shrubs in winter-irrigated compared to control plots, while summer irrigation had few effects on these variables. Irrigation in either season did not affect xylem vessel size, but did increase xylem ring width by similar to 2x and decreased xylem vessel frequency by about half. Anatomical, morphological, and stand-level abundance of A. tridentata appeared much more responsive to irrigation than state changes in gas exchange, particularly when the extra water is received during winter. Thus, it appears for sagebrush that seasonal timing is at least as important as the amount of precipitation, and that responses to changes in precipitation timing occur through changes in carbon allocation more so than changes in leaf-level carbon gain.
英文关键词	Artemisia tridentata Ecohydrology Hydraulics Photosynthesis Xylem
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000459821200006
WOS关键词	WATER RELATIONS ; GREAT-BASIN ; WARMING MANIPULATION ; SUMMER PRECIPITATION ; ARTEMISIA-TRIDENTATA ; ROCKY-MOUNTAINS ; MOJAVE DESERT ; PHOTOSYNTHESIS ; CLIMATE ; SAGEBRUSH
WOS类目	Plant Sciences ; Ecology ; Forestry
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology ; Forestry
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/2XILL650/218032
作者单位	1.Idaho State Univ, Dept Biol Sci, Pocatello, ID 83204 USA; 2.US Geol Survey, Forest & Rangeland Ecosyst Sci Ctr, Snake River Field Stn, 970 Lusk St, Boise, ID 83706 USA
推荐引用方式 GB/T 7714	Reinhardt, Keith,McAbee, Kathryn,Germino, Matthew J.. Changes in structure and physiological functioning due to experimentally enhanced precipitation seasonality in a widespread shrub species[J]. United States Geological Survey,2019,220(2):199-211.
APA	Reinhardt, Keith,McAbee, Kathryn,&Germino, Matthew J..(2019).Changes in structure and physiological functioning due to experimentally enhanced precipitation seasonality in a widespread shrub species.PLANT ECOLOGY,220(2),199-211.
MLA	Reinhardt, Keith,et al."Changes in structure and physiological functioning due to experimentally enhanced precipitation seasonality in a widespread shrub species".PLANT ECOLOGY 220.2(2019):199-211.