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DOI	10.1111/gcb.15075
	Robust ecological drought projections for drylands in the 21st century
	Bradford, John B.1; Schlaepfer, Daniel R.1,2; Lauenroth, William K.2; Palmquist, Kyle A.3
通讯作者	Bradford, John B.
来源期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
EISSN	1365-2486
出版年	2020
卷号	26 期号:7 页码:3906-3919
英文摘要	Dryland ecosystems may be especially vulnerable to expected 21st century increases in temperature and aridity because they are tightly controlled by moisture availability. However, climate impact assessments in drylands are difficult because ecological dynamics are dictated by drought conditions that are difficult to define and complex to estimate from climate conditions alone. In addition, precipitation projections vary substantially among climate models, enhancing variation in overall trajectories for aridity. Here, we constrain this uncertainty by utilizing an ecosystem water balance model to quantify drought conditions with recognized ecological importance, and by identifying changes in ecological drought conditions that are robust among climate models, defined here as when >90% of models agree in the direction of change. Despite limited evidence for robust changes in precipitation, changes in ecological drought are robust over large portions of drylands in the United States and Canada. Our results suggest strong regional differences in long-term drought trajectories, epitomized by chronic drought increases in southern areas, notably the Upper Gila Mountains and South-Central Semi-arid Prairies, and decreases in the north, particularly portions of the Temperate and West-Central Semi-arid Prairies. However, we also found that exposure to hot-dry stress is increasing faster than mean annual temperature over most of these drylands, and those increases are greatest in northern areas. Robust shifts in seasonal drought are most apparent during the cool season; when soil water availability is projected to increase in northern regions and decrease in southern regions. The implications of these robust drought trajectories for ecosystems will vary geographically, and these results provide useful insights about the impact of climate change on these dryland ecosystems. More broadly, this approach of identifying robust changes in ecological drought may be useful for other assessments of climate impacts in drylands and provide a more rigorous foundation for making long-term strategic resource management decisions.
英文关键词	global change grasslands hot drought shrublands soil moisture water balance
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000528844500001
WOS关键词	INDUCED VEGETATION SHIFTS ; CLIMATE-CHANGE ; DIE-OFF ; PLANT-COMMUNITIES ; WATER RELATIONS ; UNITED-STATES ; WOODY-PLANTS ; SOIL ; IMPACTS ; ECOHYDROLOGY
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/2XILL650/314638
作者单位	1.US Geol Survey, Southwest Biol Sci Ctr, Flagstaff, AZ 86001 USA; 2.Yale Univ, Sch Forestry & Environm Studies, New Haven, CT USA; 3.Marshall Univ, Dept Biol Sci, Huntington, WV USA
推荐引用方式 GB/T 7714	Bradford, John B.,Schlaepfer, Daniel R.,Lauenroth, William K.,et al. Robust ecological drought projections for drylands in the 21st century[J]. United States Geological Survey,2020,26(7):3906-3919.
APA	Bradford, John B.,Schlaepfer, Daniel R.,Lauenroth, William K.,&Palmquist, Kyle A..(2020).Robust ecological drought projections for drylands in the 21st century.GLOBAL CHANGE BIOLOGY,26(7),3906-3919.
MLA	Bradford, John B.,et al."Robust ecological drought projections for drylands in the 21st century".GLOBAL CHANGE BIOLOGY 26.7(2020):3906-3919.